Name: spSpec-mmmmm-pppp-fff.fit, where mmmmm is the mjd, pppp is the plate id number and fff is the fiber id number.
Produced by: spectro1d
Used by: opdb, sdbx
Archived? Yes.
SIMPLE = T BITPIX = -32 NAXIS = 2 NAXIS1 = 3849 NAXIS2 = 4 TAI = 4474845874.54 / 1st row - Number of seconds since Nov 17 1858 RA = 261.30167 / 1st row - Right ascension of telescope boresigh DEC = 60.926492 / 1st row - Declination of telescope boresight (d EQUINOX = 2000.00 / RADECSYS= 'FK5 ' / AZ = 212.819513333 / 1st row - Azimuth (encoder) of tele (0=N?) (de ALT = 48.0575580000 / 1st row - Altitude (encoder) of tele (de AIRMASS = 1.28831 / FOCUS = -999999999999.999999 / 1st row - Focus piston (microns?) DATE-OBS= '2000-09-05' / 1st row - TAI date TAIHMS = '04:27:02.14' / 1st row - TAI time (HH:MM:SS.SS) (TAI-UT = appr TIMESYS = 'tai ' / TAI, not UTC TAI-BEG = 4474843863.00 / Exposure Start Time TAI-END = 4474846879.00 / Exposure End Time MJD = 51792 / MJD of observation MJDLIST = '51792 ' / VERSION = 'v3_17_5_4' / version of IOP CAMVER = 'SPEC2 v4_5' / Camera code version OBSERVER= 'sjnk ' OBSCOMM = 'science ' TELESCOP= 'SDSS 2.5-M' / Sloan Digital Sky Survey NEXP = 12 / Number of exposures in this file EXPID00 = 'b1-51792-00006429-00006426-00006427' / ID string for exposure 0 EXPID01 = 'b1-51792-00006430-00006426-00006427' / ID string for exposure 1 EXPID02 = 'b1-51792-00006431-00006437-00006427' / ID string for exposure 2 EXPID03 = 'b2-51792-00006429-00006426-00006427' / ID string for exposure 3 EXPID04 = 'b2-51792-00006430-00006426-00006427' / ID string for exposure 4 EXPID05 = 'b2-51792-00006431-00006437-00006427' / ID string for exposure 5 EXPID06 = 'r1-51792-00006429-00006426-00006438' / ID string for exposure 6 EXPID07 = 'r1-51792-00006430-00006426-00006438' / ID string for exposure 7 EXPID08 = 'r1-51792-00006431-00006437-00006438' / ID string for exposure 8 EXPID09 = 'r2-51792-00006429-00006426-00006438' / ID string for exposure 9 EXPID10 = 'r2-51792-00006430-00006426-00006438' / ID string for exposure 10 EXPID11 = 'r2-51792-00006431-00006437-00006438' / ID string for exposure 11 EXPT_B1 = 2700.00 / b1 camera exposure time (seconds) EXPT_B2 = 2700.00 / b2 camera exposure time (seconds) EXPT_R1 = 2700.00 / r1 camera exposure time (seconds) EXPT_R2 = 2700.00 / r2 camera exposure time (seconds) EXPTIME = 2700.00 / Minimum of exposure times for all cameras SPCOADD = 'Fri Jun 28 15:25:10 2002' / SPCOADD finished FLAVOR = 'science ' / Flavor of this sequence (e.g., dome flat, etc.) QUALITY = 'unknown ' / night/image quality RADEG = 2.61302400000000E+02 / Right Ascension. (degrees) DECDEG = 6.09272200000000E+01 / Declination. (degrees) PLATEID = 354 / Plate Id TILEID = 153 / Tile Id CARTID = 2 /Cartridge used in this plugging REDDEN = '0.1724 0.1269 0.0920 0.0698 0.0495' / Median reddening vector for pla MAPID = 5179001 / Map Id NAME = '0354-51790-01' / Name of target; PlateId-MJD-Mapper ReRun NGUIDE = 27.0000 / Number of guider frames during exposure SEEING20= 1.40667 / 20% seeing during exposure (arcsec) SEEING50= 1.50333 / 50% seeing during exposure (arcsec) SEEING80= 1.65667 / 80% seeing during exposure (arcsec) RMSOFF20= 0.308173333333 / 20% RMS offset of guide fibers (arcsec) RMSOFF50= 0.430279000000 / 50% RMS offset of guide fibers (arcsec) RMSOFF80= 0.549163333333 / 80% RMS offset of guide fibers (arcsec) COLBIN = 1 / Binning factor perpendicular to the columns ROWBIN = 1 / Binning factor perpendicular to the rows PROGRAM = 'binning 1 1 ' / Identifying name for CCD program SECFOCUS= -3.0000000000000E+02 / Secondary Mirror Position as reported by TCC GUIDEIMG= '/data/spectro/guider/gimg0084.fits' / Last archived guider image WTIME = 968128309.000 / weatherData(timeStamp) AIRTEMP = 16.8000000000 / weatherData(airtemp) DEWPOINT= -0.433333333333 / weatherData(dewpoint) DEWDEP = 17.2333333333 / weatherData(dewpointDep) DUSTA = 85468.0000000 / weatherData(dusta) DUSTB = 957.333333333 / weatherData(dustb) DUSTC = 99940.0000000 / weatherData(dustc) DUSTD = 955.333333333 / weatherData(dustd) GUSTD = 1.32300000000000E+02 / weatherData(gustd) GUSTS = 21.7000000000 / weatherData(gusts) HUMIDITY= 30.9333333333 / weatherData(humidity) HUMIDOUT= 30.6666666667 / weatherData(humidout) PRESSURE= 21.7000000000 / weatherData(pressure) WINDD = 132.000000000 / weatherData(windd) WINDS = 17.5333333333 / weatherData(winds) TEMP01 = -93.6200000000 / CCD 01 Temperature TEMP02 = -93.3600000000 / CCD 02 Temperature TEMP03 = -92.5800000000 / CCD 03 Temperature TEMP04 = -92.8400000000 / CCD 04 Temperature AZ_OFF = 0.00000000000000E+00 / Azimuth Offset (Diamond Pointing) ALT_OFF = 0.00000000000000E+00 / Altitude Offset (Diamond Pointing) VERSIDL = '5.4 ' / Version of IDL VERSUTIL= 'v4_9_7 ' / Version of idlutils VERSREAD= 'v4_9_8 ' / Version of idlspec2d for pre-processing raw dat VERS2D = 'v4_9_8 ' / Version of idlspec2d for 2D reduction VERSCOMB= 'v4_9_8 ' / Version of idlspec2d for combining multiple spe VERSLOG = 'Unknown ' / Version of SPECLOG product VERSFLAT= 'v1_4 ' / Version of SPECFLAT product OPBC = 'opBC-50000.par' / OPCONFIG= 'opConfig-50000.par' / OPECALIB= 'opECalib-51577.par' / XSIGMA = 0.947553247927 / XSIGMIN = 0.842633000000 / XSIGMAX = 1.11480998993 / WSIGMA = 0.937792500000 / WSIGMIN = 0.898409000000 / WSIGMAX = 0.988289000000 / PLUGFILE= 'plPlugMapM-0354-51790-01.par' / LAMPLIST= 'lamphgcdne.dat' / SKYLIST = 'skylines.dat' / HELIO_RV= 3.38344063555 / Heliocentric correction (added to velocities) VACUUM = T / Wavelengths are in vacuum SFLATTEN= T / Superflat has been applied PSFSKY = 3 / Order of PSF skysubtraction SKYCHI2 = 0.967572500439 / Mean chi^2 of sky-subtraction SCHI2MIN= 0.931639000000 / SCHI2MAX= 1.01598000526 / PREJECT = 0.200000 / Profile area rejection threshold SPEC1_G = 19.9614 /(S/N)^2 for spec 1 at mag 20.20 SPEC1_R = 30.2269 /(S/N)^2 for spec 1 at mag 20.25 SPEC1_I = 25.6335 /(S/N)^2 for spec 1 at mag 19.90 SPEC2_G = 18.0590 /(S/N)^2 for spec 2 at mag 20.20 SPEC2_R = 28.4687 /(S/N)^2 for spec 2 at mag 20.25 SPEC2_I = 23.9591 /(S/N)^2 for spec 2 at mag 19.90 LOWREJ = 5 / Extraction: low rejection HIGHREJ = 8 / Extraction: high rejection SCATPOLY= 5 / Extraction: Order of scattered light polynomial PROFTYPE= 3 / Extraction profile: 1=Gaussian NFITPOLY= 1 / Extraction: Number of parameters in each profil XCHI2 = 1.38691 / Extraction: Mean chi^2 XCHI2MIN= 1.20964 / XCHI2MAX= 1.66991 / ROFFSET1= -0.00763309 /Mean r-band mag difference (spectro - photo) RSIGMA1 = 0.190664 /Stddev of r-band mag difference (spectro - photo GROFF1 = 0.0870182 /Mean (g-r) color difference (spectro - photo) GRSIGMA1= 0.453493 /Stddev of (g-r) color difference (spectro - phot ROFFSET2= -0.0414150 /Mean r-band mag difference (spectro - photo) RSIGMA2 = 0.163316 /Stddev of r-band mag difference (spectro - photo GROFF2 = 0.0145647 /Mean (g-r) color difference (spectro - photo) GRSIGMA2= 0.336159 /Stddev of (g-r) color difference (spectro - phot NWORDER = 2 / Linear-log10 coefficients WFITTYPE= 'LOG-LINEAR' / Linear-log10 dispersion UNAME = 'fnpc73 ' / SMEARUSE= T / Smear image used? SFD_USED= T / SFD dust maps used? XYGRSIG1= 0.0621177 / Sigma of (g-r) offsets as a fcn of plate x/y XYGRSIG2= 0.0191772 / Sigma of (g-r) offsets as a fcn of plate x/y MPGRSIG1= 0.0445317 / Sigma of (g-r)_model - (g-r)_photo Spec 1 MPGRSIG2= 0.0306900 / Sigma of (g-r)_model - (g-r)_photo Spec 2 MPGROFF1= 0.0247127 / Mean of (g-r)_model - (g-r)_photo of Spec 1 MPGROFF2= 0.00158501 / Mean of (g-r)_model - (g-r)_photo of Spec 2 FBADPIX = 0.0189197 / Fraction of bad pixels FBADPIX1= 0.0178169 / Fraction of bad pixels on spectro-1 FBADPIX2= 0.0200191 / Fraction of bad pixels on spectro-2 WAT0_001= 'system=linear' / WAT1_001= 'wtype=linear label=Wavelength units=Angstroms' / CRPIX1 = 1 / Starting pixel (1-indexed) CTYPE1 = 'LINEAR ' / DC-FLAG = 1 / Log-linear flag PIXMIN = 0.00000000000000E+00 / Place Holder PIXMAX = 2.04700000000000E+03 / Place Holder ARRAY1 = 'SPECTRUM' / units of (10^-17 erg/s/cm^2/A ARRAY2 = 'CONTINUUM-SUBTRACTED SPECTRUM' / units of (10^-17 erg/s/cm^2/A ARRAY3 = 'ERROR ' / units of (10^-17 erg/s/cm^2/A ARRAY4 = 'MASK ' / mask bit array SN_G = 8.04687000000000E+00 / Median S/N ration ig g' MAG_G = 1.95412000000000E+01 / Synthetic magnitude in g' SN_R = 1.08943000000000E+01 / Median S/N ratio in r' MAG_R = 1.92726000000000E+01 / Synthetic magnitude in r' SN_I = 8.89338000000000E+00 / Median S/N ratio in i' MAG_I = 1.91939000000000E+01 / Synthetic magnitude in i' SCI_SN = 5.64089000000000E+00 / Science signal to noise ratio SMEAR_SN= 1.21036000000000E+00 / Smear signal to noise ratio SM_LEG_0= 3.19574000000000E+00 / 1st legendre coeff. for smear correct SM_LEG_1= -2.1375500000000E+00 / 2nd legendre coeff. for smear correct SM_LEG_2= 1.38465000000000E+00 / 3rd legendre coeff. for smear correct OBJID = ' 1359 0 4 56 265' / run rerun camcol field objID MAG = ' 19.9526 19.4762 19.3762 19.1735 19.2537' / fiber Mags OBJTYPE = 'QSO ' / object Type RAOBJ = 2.61528710000000E+02 / RA(deg) of object DECOBJ = 6.07020680000000E+01 / DEC(deg) of object XFOCAL = 2.40806440000000E+01 / Primary Target Flag YFOCAL = -4.8912450000000E+01 / Secondary Target Flag PRIMTARG= 1048580 / fiber ID SECTARGE= 0 / fiber ID FIBERID = 153 / fiber ID SPECID = 1 / spectrograph ID NGOOD = 3838 / Number of Good Pixels VERS_1D = 'v5_7_2 ' / Version of Spectro1d BESTTEMP= 20 / Best cross-correlation template BUNIT = '1.0E-17 erg/cm^2/s/Ang' / Oct 2002 Version COEFF0 = 3.57920000000000E+00 / Center wavelength (log10) of first pi COEFF1 = 1.00000000000000E-04 / Log10 dispersion per pixel CRVAL1 = 3.57920000000000E+00 / Iraf zero point CD1_1 = 1.00000000000000E-04 / Iraf dispersion 1D_PDATE= '10/20/02:05:04:36' / 1D Processing/last Modification date SPEC_CLN= 1 / Spectral Classn (allowed values are given below) VEL_DIS = -9.9990000000000E+03 / Velocity dispersion (km/s) VEL_DISE= -9.9990000000000E+03 / Error on Velocity Dispersion (km/s) Z = -3.7987600000000E-05 / Final redshift Z_ERR = 3.97400000000000E-04 / Redshift error Z_CONF = 5.68167000000000E-01 / Redshift confidence Z_STATUS= 5 / Redshift Status (for legal values see below) Z_WARNIN= 4128 / Redshift Warning Flags (for legal values see below) ECLASS = -3.0499700000000E-01 / galaxy classification parameter ECOEFF1 = 9.58722000000000E-01 / 1st expansion coefficient ECOEFF2 = -2.0545700000000E-01 / 2nd expansion coefficient ECOEFF3 = 1.80952000000000E-01 / 3rd expansion coefficient ECOEFF4 = -2.4917800000000E-02 / 4th expansion coefficient ECOEFF5 = -7.2626400000000E-02 / 5th expansion coefficient EXTEND = T / Binary tables follow END
SP_MASK_OK = 0x000, SP_MASK_NOPLUG = 0x001, /* Fiber not listed in plugmap file */ SP_MASK_BADTRACE = 0x002, /* Bad trace from routine TRACE320CRUDE */ SP_MASK_BADFLAT = 0x004, /* Low counts in fiberflat */ SP_MASK_BADARC = 0x008, /* Bad arc solution */ SP_MASK_MANYBADCOL = 0x010, /* More than 10% pixels are bad columns */ SP_MASK_MANYREJECT = 0x020, /* More than 10% pixels are rejected in extraction */ SP_MASK_LARGESHIFT = 0x040, /* Large spatial shift between flat and object position */ SP_MASK_NEARBADPIX = 0x10000, /* Bad pixel within 3 pixels of trace */ SP_MASK_LOWFLAT = 0x20000, /* Flat field less than 0.5 */ SP_MASK_FULLREJECT = 0x40000, /* Pixel fully rejected in extraction */ SP_MASK_PARTIALREJ = 0x80000, /* Some pixels rejected in extraction */ SP_MASK_SCATLIGHT = 0x100000, /* Scattered light significant */ SP_MASK_CROSSTALK = 0x200000, /* Cross-talk significant */ SP_MASK_NOSKY = 0x400000, /* Sky level unknown at this wavelength */ SP_MASK_BRIGHTSKY = 0x800000, /* Sky level > flux + 10*(flux error) */ SP_MASK_NODATA = 0x1000000, /* No data available in combine B-spline */ SP_MASK_COMBINEREJ = 0x2000000, /* Rejected in combine B-spline */ SP_MASK_BADFLUXFACTOR= 0x4000000, /* Low flux-calibration or flux-correction factor */ SP_MASK_BADSKYCHI = 0x8000000, /* Chi^2 > 4 in sky residuals at this wavelength */ SP_MASK_REDMONSTER = 0x10000000, /* Contiguous region of bad chi^2 in sky residuals */ SP_MASK_EMLINE = 0x40000000 /* Emission line detected here */
SPEC_UNKNOWN = 0 SPEC_STAR = 1 SPEC_GALAXY = 2 SPEC_QSO = 3 SPEC_HIZ_QSO = 4 /* high redshift QSO, z>2.3, Ly-alpha finding code is triggered */ SPEC_SKY = 5 STAR_LATE = 6 /* star dominated by molecular bands, Type M or later */ GAL_EM = 7 /* emission line galaxy -- not set by the code */
NOT_MEASURED = 0 /* Not yet measured */ FAILED = 1 /* Redshift measurement failed */ INCONSISTENT = 2 /* Xcorr & emz redshifts both high-confidence but inconsistent */ XCORR_EMLINE = 3 /* Xcorr plus consistent emz redshift measurement */ XCORR_HIC = 4 /* z determined from x-corr with high confidence */ XCORR_LOC = 5 /* z determined from x-corr with low confidence */ EMLINE_XCORR = 6 /* Emz plus consistent xcorr redshift measurement */ EMLINE_HIC = 7 /* z determined from em-lines with high confidence */ EMLINE_LOC = 8 /* z determined from em-lines with low confidence */ MANUAL_HIC = 9 /* z determined "by hand" with high confidence */ MANUAL_LOC = 10 /* z determined "by hand" with low confidence */ XCORR_4000BREAK= 11 /* Xcorr redshift determined when EW(4000break) > 0.95 */ ABLINE_CAII = 12 /* Redshift determined from average of CaII triplet fits */
Z_WARNING_OK = 0x000, /* no warnings */ Z_WARNING_NO_SPEC = 0x001, /* no spec */ Z_WARNING_NO_BLUE = 0x002, /* no blueside */ Z_WARNING_NO_RED = 0x004, /* no redside */ Z_WARNING_NOT_GAL = 0x010, /* classification does not match galaxy target */ Z_WARNING_NOT_QSO = 0x020, /* classification does not match qso target */ Z_WARNING_NOT_STAR = 0x040, /* classification does not match star target */ Z_WARNING_GAL_COEF = 0x080, /* strange galaxy coefficients */ Z_WARNING_EMAB_INC = 0x100, /* emission and absorbtion redshifts inconsistent */ Z_WARNING_AB_INC = 0x200, /* absorbtion redshifts inconsistent ,multiple peaks*/ Z_WARNING_EM_INC = 0x400, /* emission redshifts inconsistent */ Z_WARNING_HIZ = 0x800, /* redshift is high */ Z_WARNING_LOC = 0x1000, /* confidence is low */ Z_WARNING_LOW_SNG = 0x2000, /* signal to noise is low in g' */ Z_WARNING_LOW_SNR = 0x4000, /* signal to noise is low in r' */ Z_WARNING_LOW_SNI = 0x8000, /* signal to noise is low in i' */ Z_WARNING_4000break = 0x10000, /* EW(4000break) > 0.95 */ Z_WARNING_CL_MAN = 0x20000, /* classification set manually */ Z_WARNING_Z_MAN = 0x40000 /* redshift set manually */
These HDUs list the measured properties of individual emission/absorption lines in the spectrum. There are two HDUs of this type. The first HDU of this type (HDU 1) lists all lines found automatically by the wavelet filter, with no apriori knowledge of the redshift. The second HDU of this type (HDU 2) lists all lines measured based on their expected positions from the highest-confidence emission line redshift. Under most circumstances, the line measurements in HDU 2 should be used.
The following lines are measured, those with positive weights are used to estimate the emission line redshifts for galaxies or qso's:
| restWave | meanOffset | galWeight | qsoWeight | Name | |
|---|---|---|---|---|---|
| 1033.82 | 0.0 | 0.0 | 1.0 | OVI | |
| 1215.67 | 0.0 | 0.0 | 9.0 | Ly\\d\\ga | |
| 1240.81 | -1.41 | 0.0 | 3.0 | NV | |
| 1305.53 | 0.0 | 0.0 | 0.0 | OI | |
| 1335.31 | 0.0 | 0.0 | 0.0 | CII | |
| 1399.8 | 0.0 | 0.0 | 1.0 | SiIV+OIV | |
| 1549.48 | -3.62 | 0.0 | 8.0 | CIV | |
| 1640.4 | 0.0 | 0.0 | 0.0 | HeII | |
| 1665.85 | 0.0 | 0.0 | 0.0 | OIII | |
| 1857.4 | 0.0 | 0.0 | 0.0 | AlIII | |
| 1908.734 | 0.0 | 0.0 | 7.0 | CIII | |
| 2326.0 | 0.0 | 0.0 | 0.5 | CII | |
| 2439.5 | 0.0 | 0.0 | 0.0 | NeIV | |
| 2799.117 | 1.203 | 1.0 | 8.0 | MgII | |
| 3346.79 | 0.0 | 0.0 | 0.0 | NeV | |
| 3426.85 | 0.0 | 0.0 | 0.0 | NeV | |
| 3727.092 | 1.208 | 5.0 | 1.0 | OII | |
| 3729.875 | 0.0 | 0.0 | 0.0 | OII | |
| 3798.976 | 0.0 | -1.0 | 0.0 | H\\d\\gh | |
| 3836.47 | 0.0 | -1.0 | 0.0 | H\\d\\gy | |
| 3889.0 | 0.0 | -1.0 | 0.0 | HeI | |
| 3934.777 | 0.0 | -1.0 | 0.0 | K | |
| 3969.588 | 0.0 | -1.0 | 0.0 | H | |
| 4072.3 | 0.0 | 0.0 | 0.0 | SII | |
| 4102.89 | 0.0 | 0.5 | 2.0 | H\\d\\gd | |
| 4305.61 | 0.0 | -1.0 | 0.0 | G | |
| 4341.68 | 0.0 | 1.0 | 3.0 | H\\d\\gg | |
| 4364.436 | 0.0 | 0.0 | 0.0 | OIII | |
| 4862.68 | 0.0 | 2.0 | 4.0 | H\\d\\gb | |
| 4960.295 | 0.0 | 2.0 | 2.0 | OIII | |
| 5008.240 | 0.0 | 3.0 | 2.0 | OIII | |
| 5176.7 | 0.0 | -1.0 | 0.0 | Mg | |
| 5895.6 | 0.0 | -1.0 | 0.0 | Na | |
| 6302.046 | 0.0 | 0.0 | 0.0 | OI | |
| 6365.536 | 0.0 | 0.0 | 0.0 | OI | |
| 6549.86 | 0.0 | 3.0 | 0.0 | NII | |
| 6564.61 | 0.0 | 8.0 | 8.0 | H\\d\\ga | |
| 6585.27 | 0.0 | 3.0 | 0.0 | NII | |
| 6707.89 | 0.0 | 0.0 | 0.0 | Li | |
| 6718.29 | 0.0 | 3.0 | 0.0 | SII | |
| 6732.67 | 0.0 | 3.0 | 0.0 | SII | |
| 8500.36 | 0.0 | 0.0 | 0.0 | CaII | |
| 8544.44 | 0.0 | 0.0 | 0.0 | CaII | |
| 8664.52 | 0.0 | 0.0 | 0.0 | CaII |
XTENSION= 'BINTABLE' BITPIX = 8 NAXIS = 2 NAXIS1 = 89 NAXIS2 = 10 PCOUNT = 0 GCOUNT = 1 TFIELDS = 23 TFORM1 = '1E ' TTYPE1 = 'wave ' / Line center TUNIT1 = 'Å ' TFORM2 = '1E ' TTYPE2 = 'waveErr ' / Error in line center TUNIT2 = 'Å ' TFORM3 = '1E ' TTYPE3 = 'waveMin ' / Minimum wavelength of line influence TUNIT3 = 'Å ' TFORM4 = '1E ' TTYPE4 = 'waveMax ' / Maximum wavelength of line influence TUNIT4 = 'Å ' TFORM5 = '1E ' TTYPE5 = 'sigma ' / Sigma of fitted Gaussian TUNIT5 = 'Å ' TFORM6 = '1E ' TTYPE6 = 'sigmaErr' / Error in sigma TUNIT6 = 'Å ' TFORM7 = '1E ' TTYPE7 = 'sigmaMin' / Minimum sigma allowed for fit TUNIT7 = 'Å ' TFORM8 = '1E ' TTYPE8 = 'sigmaMax' / Maximum sigma allowed for fit TUNIT8 = 'Å ' TFORM9 = '1E ' TTYPE9 = 'height ' / Height of gaussian TUNIT9 = '10^-17 ergs/s/cm^2/Å' TFORM10 = '1E ' TTYPE10 = 'heightErr' / Error in height TUNIT10 = '10^-17 ergs/s/cm^2/Å' TFORM11 = '1E ' TTYPE11 = 'continuum' / Value of continuum at line center TUNIT11 = '10^-17 ergs/s/cm^2/Å' TFORM12 = '1E ' TTYPE12 = 'ew ' / Equivalent width TUNIT12 = 'Å ' TFORM13 = '1E ' TTYPE13 = 'ewErr ' / Error in equivalent width TUNIT13 = 'Å ' TFORM14 = '1E ' TTYPE14 = 'ewMin ' / Minimum equilavelent width allowed for line detection TUNIT14 = 'Å ' TFORM15 = '1E ' TTYPE15 = 'specIndex' / Spectral index TUNIT15 = 'unitless' TFORM16 = '1E ' TTYPE16 = 'nsigma ' / Significance of line in number of sigma TUNIT16 = 'unitless' TFORM17 = '1E ' TTYPE17 = 'chisq ' / Chi-squared of fit TUNIT17 = 'unitless' TFORM18 = '1J ' TTYPE18 = 'nu ' / Degrees of freedom = npix - 3 TUNIT18 = 'unitless' TFORM19 = '1E ' TTYPE19 = 'restWave' / Restwavelength, also serves as line ID TUNIT19 = 'Å ' TFORM20 = '1E ' TTYPE20 = 'weight ' / Weight of line in fit TUNIT20 = 'unitless' TFORM21 = '1E ' TTYPE21 = 'z ' / Redshift of this line TUNIT21 = 'unitless' TFORM22 = '1E ' TTYPE22 = 'zErr ' / Error in redshift TUNIT22 = 'unitless' TFORM23 = '1A ' TTYPE23 = 'lineMask' / Line mask TUNIT23 = 'unitless' COMMENT 'lineMask' is a bit mask, with the following bits defined COMMENT SP_LINE_WAVELET = 0x001, /* detected by wavelet filter */ COMMENT SP_LINE_WZ = 0x002, /* detected by Wei Zheng algorithm */ COMMENT SP_LINE_BLENDED = 0x004, /* blended with another line */ COMMENT SP_LINE_MINIMIZE= 0x008 /* line & continuum fitted simultaneously*/
XTENSION= 'BINTABLE' BITPIX = 8 NAXIS = 2 NAXIS1 = 24 NAXIS2 = XXX PCOUNT = 0 GCOUNT = 1 TFIELDS = 6 TFORM1 = '1E ' TTYPE1 = 'z ' / Redshift TUNIT1 = 'unitless' TFORM2 = '1E ' TTYPE2 = 'zErr ' / Error in redshift TUNIT2 = 'unitless' TFORM3 = '1E ' TTYPE3 = 'conf ' / Confidence in redshift TUNIT3 = 'unitless' TFORM4 = '1J ' TTYPE4 = 'nFit' / Number of matched lines TUNIT4 = 'unitless' TFORM5 = '1E ' TTYPE5 = 'wtFit' / Weight of fit lines TUNIT5 = 'unitless'
XTENSION= 'BINTABLE' BITPIX = 8 NAXIS = 2 NAXIS1 = 48 NAXIS2 = 31 PCOUNT = 0 GCOUNT = 1 TFIELDS = 12 TFORM1 = '1J ' TTYPE1 = 'temp_no ' / ID of template used TUNIT1 = 'unitless' TFORM2 = '1J ' TTYPE2 = 'peak_no ' / 1=first peak, 2=second peak, etc for templat TUNIT2 = 'unitless' TFORM3 = '1E ' TTYPE3 = 'shift ' / Number of pixels between between object and template TUNIT3 = 'pixels ' TFORM4 = '1E ' TTYPE4 = 'z ' / Redshift from this correlation peak TUNIT4 = 'unitless' TFORM5 = '1E ' TTYPE5 = 'zErr ' / Error in redshift TUNIT5 = 'unitless' TFORM6 = '1E ' TTYPE6 = 'r ' / Tonry & Davis R value TUNIT6 = 'unitless' TFORM7 = '1E ' TTYPE7 = 'con ' / Confidence TUNIT7 = 'unitless' TFORM8 = '1E ' TTYPE8 = 'height ' / Height of CCF peak TUNIT8 = 'unitless' TFORM9 = '1E ' TTYPE9 = 'width ' / Width of CCF peak TUNIT9 = 'unitless' TFORM10 = '1E ' TTYPE10 = 'widthErr' / Error on the width of CCF peak TUNIT10 = 'unitless' TFORM11 = '1E ' TTYPE11 = 'delta ' / Error on the location CCF peak TUNIT11 = 'unitless' TFORM12 = '1E ' TTYPE12 = 'rms ' / Rms of CCF TUNIT12 = 'unitless'
A number of standard line indices and flux ratios are stored here. There is one HDU of this type.
We calculate the Lick Indices (Trager
et al. 1998), those of Brodie
& Hanes 1986 (see also Huchra
et al. 1996) and those of Diaz,
Terlevich & Terlevich 1989. We also calculate two break ratios
D4000 and HKratio. The latter are calculated
using the spectral regions in the second table below.
Following the SDSS convention, all wavelengths are given as vacuum wavelengths. The value of the break ratios are stored as (eW) in the line index table. The break indices are calculated somewhat unconventionally as (blue flux)/(red flux) so for most galaxies the value is < 1. Atomic and molecular indices are computed in the same fashion; results are returned both as equivalent widths (eW, conventionally used for atomic indices) and magnitudes (mag, conventionally used for molecular indices). The Lick standards are too bright to be observed by SDSS and therefore these indices are not on the Lick system in the classical sense, nor is any attempt made to smooth to Lick resolution.
| Name | Index Begin | Index End | Blue Cont Begin | Blue Cont End | Red Cont Begin | Red Cont End |
| Lick_CN1 | 4143.375 | 4178.375 | 4081.375 | 4118.875 | 4245.375 | 4285.375 |
| Lick_CN2 | 4143.375 | 4178.375 | 4085.125 | 4097.625 | 4245.375 | 4285.375 |
| Lick_Ca4227 | 4223.500 | 4236.000 | 4212.250 | 4221.000 | 4242.250 | 4252.250 |
| Lick_G4300 | 4282.625 | 4317.625 | 4267.625 | 4283.875 | 4320.125 | 4333.375 |
| Lick_Fe4383 | 4370.375 | 4421.625 | 4360.375 | 4371.625 | 4444.125 | 4456.625 |
| Lick_Ca4455 | 4453.375 | 4475.875 | 4447.125 | 4455.875 | 4478.375 | 4493.375 |
| Lick_Fe4531 | 4515.500 | 4560.500 | 4505.500 | 4515.500 | 4561.750 | 4580.500 |
| Lick_C4668 | 4635.250 | 4721.500 | 4612.750 | 4631.500 | 4744.000 | 4757.750 |
| Lick_Hb | 4848.875 | 4877.625 | 4828.875 | 4848.875 | 4877.625 | 4892.625 |
| Lick_Fe5015 | 4979.000 | 5055.250 | 4947.750 | 4979.000 | 5055.250 | 5066.500 |
| Lick_Mg1 | 5070.375 | 5135.375 | 4896.375 | 4958.875 | 5302.375 | 5367.375 |
| Lick_Mg2 | 5155.375 | 5197.875 | 4896.375 | 4958.875 | 5302.375 | 5367.375 |
| Lick_Mgb | 5143.875 | 5162.625 | 5161.375 | 5193.875 | 5192.625 | 5207.625 |
| Lick_Fe527 | 5247.375 | 5287.375 | 5234.875 | 5249.875 | 5287.375 | 5319.875 |
| Lick_Fe5335 | 5314.125 | 5354.125 | 5306.625 | 5317.875 | 5355.375 | 5365.375 |
| Lick_Fe5406 | 5390.250 | 5417.750 | 5379.000 | 5390.250 | 5417.750 | 5427.750 |
| Lick_Fe5709 | 5698.375 | 5722.125 | 5674.625 | 5698.375 | 5724.625 | 5738.375 |
| Lick_Fe5782 | 5778.375 | 5798.375 | 5767.125 | 5777.125 | 5799.625 | 5813.375 |
| Lick_NaD | 5878.625 | 5911.125 | 5862.375 | 5877.375 | 5923.875 | 5949.875 |
| Lick_TiO1 | 5938.875 | 5995.875 | 5818.375 | 5850.875 | 6040.375 | 6105.375 |
| Lick_TiO2 | 6191.375 | 6273.875 | 6068.375 | 6143.375 | 6374.375 | 6416.875 |
| B&H_CNB | 3810.0 | 3910.0 | 3785.0 | 3810.0 | 3910.0 | 3925.0 |
| B&H_H=K | 3925.0 | 3995.0 | 3910.0 | 3925.0 | 3995.0 | 4010.0 |
| B&H_CaI | 4215.0 | 4245.0 | 4200.0 | 4215.0 | 4245.0 | 4260.0 |
| B&H_G | 4285.0 | 4315.0 | 4275.0 | 4285.0 | 4315.0 | 4325.0 |
| B&H_CaI | 4215.0 | 4245.0 | 4200.0 | 4215.0 | 4245.0 | 4260.0 |
| B&H_G | 4285.0 | 4315.0 | 4275.0 | 4285.0 | 4315.0 | 4325.0 |
| B&H_Hb | 4830.0 | 4890.0 | 4800.0 | 4830.0 | 4890.0 | 4920.0 |
| B&H_MgG | 5150.0 | 5195.0 | 5125.0 | 5150.0 | 5195.0 | 5220.0 |
| B&H_MH | 4940.0 | 5350.0 | 4740.0 | 4940.0 | 5350.0 | 5550.0 |
| B&H_FC | 5250.0 | 5280.0 | 5225.0 | 5250.0 | 5280.0 | 5305.0 |
| B&H_NaD | 5865.0 | 5920.0 | 5835.0 | 5865.0 | 5920.0 | 5950.0 |
| DTT_CaII8498 | 8483.0 | 8513.0 | 8447.5 | 8462.5 | 8842.5 | 8857.5 |
| DTT_CaII8542 | 8527.0 | 8557.0 | 8447.5 | 8462. | 8842.5 | 8857.5 |
| DTT_CaII8662 | 8467.0 | 8677.0 | 8447.5 | 8462.5 | 8842.5 | 8857.5 |
| DTT_MgI8807 | 8799.5 | 8814.5 | 8775.0 | 8787.0 | 8845.0 | 8855.0 |
We also calculate the following line ratios:
| Name | Blue Begin | Blue End | Red Begin | Red End |
| 4000Abreak | 3750. | 3950. | 4050. | 4250. |
| HKratio | 3920. | 3945. | 3955. | 3980. |
XTENSION= 'BINTABLE' BITPIX = 8 NAXIS = 2 NAXIS1 = 51 NAXIS2 = 32 PCOUNT = 0 GCOUNT = 1 TFIELDS = 9 TFORM1 = '19A ' TTYPE1 = 'name ' / Name of the line index TUNIT1 = 'unitless' TFORM2 = '1E ' TTYPE2 = 'ew ' / Equivalent width of the line index (or flux ratio in the case of 4000Abreak, and HKratio) TUNIT2 = 'Å ' TFORM3 = '1E ' TTYPE3 = 'ewErr ' / Error on the equivalent width TUNIT3 = 'Å ' TFORM4 = '1E ' TTYPE4 = 'mag ' / Magnitude of the line index TUNIT4 = 'unitless' TFORM5 = '1E ' TTYPE5 = 'magErr ' / Error on the magnitude TUNIT5 = 'unitless' TFORM6 = '1E ' TTYPE6 = 'waveMin ' / Minimum wavelength used to calculate the index TUNIT6 = 'unitless' TFORM7 = '1E ' TTYPE7 = 'waveMax ' / Maximum wavelength used to calculate the index TUNIT7 = 'unitless' TFORM8 = '1E ' TTYPE8 = 'z ' / Redshift used to calculate the index TUNIT8 = 'unitless' TFORM9 = '1E ' TTYPE9 = 'sn ' / Signal to noise ratio over the index TUNIT9 = 'unitless'
The masks as passed from spPlate*.fit (the mask bit values are a subset of those used in the mask array above), as well as the resolution. The length of this table should be the same as the length of the spectrum. There is one HDU of this type.
The resolution column is copied from HDU 4 of the spPlate*.fit
file. It contains the RMS resolution at each pixel in units of pixels.
To get the FWHM resolution, multiply the pixel values by sqrt(8*ln(2))
∼ 2.35. Since the spectra are binned with constant logarithmic
dispersion, the pixel size is fixed in velocity space at 69 km/s =
ln(10) * c * 0.0001, where 0.0001 is the log10 dispersion
per pixel (stored in the primary header keyword CD1_1). To convert
to resolution in wavelength units, multiply by the local pixel size in
wavelength units, which is ln(10) * lambda * 0.0001 where lambda is
the wavelength of the pixel and 0.0001 is again the log10
dispersion.
XTENSION= 'BINTABLE' BITPIX = 8 NAXIS = 2 NAXIS1 = 12 NAXIS2 = 3850 PCOUNT = 0 GCOUNT = 1 TFIELDS = 3 TFORM1 = '1J ' TTYPE1 = 'andMask ' / AND mask TUNIT1 = 'unitless' TFORM2 = '1J ' TTYPE2 = 'orMask ' / OR mask TUNIT2 = 'unitless' TFORM3 = '1E ' TTYPE3 = 'dispRes ' / Wavelength dispersion TUNIT3 = 'pixels '