The spectroscopic observations combine 3 or more exposures of 15 minutes each, each of which consists of red and blue halves. The combined spectra are available in the spPlate file. The spCFrame files contain the extracted spectra for a single CCD (i.e., the red or blue half) of a single exposure. These spectra are still in the native wavelength mapping, which is neither linear in wavelength nor log-wavelength. However, the spectra are flux-calibrated, and deviant pixels are rejected in the pixel mask (from the comparison with the other exposures).
The spCFrame file contains the following:
HDU #0 = Flux in units of 10^(-17) erg/s/cm^2/Ang [FLOAT]
HDU #1 = Inverse variance (1/sigma^2) for the above [FLOAT]
HDU #2 = Pixel mask [32-bit INT]
HDU #3 = Wavelength solution in log-10 Angstroms (vacuum) [FLOAT]
HDU #4 = Wavelength dispersion in units of (10^(-4) log-10 wavelength)^(-1) [FLOAT]
(these are the same units as in the combined-spectrum spPlate file)
HDU #5 = Plug-map structure from plPlugMapM file [BINARY FITS TABLE]
HDU #6 = Sky flux in units of 10^(-17) erg/s/cm^2/Ang [FLOAT]
Flux density in units of 10^{-17} erg/s/cm^2/A
SIMPLE = T / FIT STANDARD BITPIX = -32 / FITS BITS/PIXEL NAXIS = 2 / NUMBER OF AXES NAXIS1 = 2048 / WIDTH (TOTAL!) NAXIS2 = 320 / HEIGHT (TOTAL!) EXTEND = T / TAI = 4606272460.09 / 1st row - Number of seconds since Nov 17 1858 RA = 39.822852 / 1st row - Right ascension of telescope boresigh DEC = 0.036944 / 1st row - Declination of telescope boresight (d EQUINOX = 2000.00 / RADECSYS= 'FK5 ' / SPA = 359.998 / 1st row - Camera col position angle wrt north ( IPA = 332.026 / 1st row - Instrument rotator position angle (de IPARATE = -0.0048 / 1st row - Instrument rotator angular velocity ( AZ = 326.04356 / 1st row - Azimuth (encoder) of tele (0=N?) (de ALT = 52.269743 / 1st row - Altitude (encoder) of tele (de AIRMASS = 1.26042 / FOCUS = 0.000000 / 1st row - Focus piston (microns?) DATE-OBS= '2004-11-04' / 1st row - TAI date TAIHMS = '08:07:40.09' / 1st row - TAI time (HH:MM:SS.SS) (TAI-UT = appr TIMESYS = 'tai ' / TAI, not UTC TAI-BEG = 4606271477.00 / Exposure Start Time TAI-END = 4606272409.00 / Exposure End Time MJD = 53313 / MJD of observation VERSION = 'v3_142_0' / version of IOP CAMVER = 'SPEC1 v4_8' / Camera code version OBSERVER= 'ank ' OBSCOMM = 'science ' TELESCOP= 'SDSS 2.5-M' / Sloan Digital Sky Survey SEQID = 29120 / Spectro sequence number, unique over EXPOSURE= 29122 / Spectro exposure number, unique over EXPTIME = 9.00100000000000E+02 / Exposure time. (seconds) DARKTIME= 9.32000000000000E+02 / Time between flush charge and read-ou FLAVOR = 'science ' / Flavor of this sequence (e.g., dome f QUALITY = 'excellent' / night/image quality RADEG = 3.98223500000000E+01 / Right Ascension. (degrees) DECDEG = 3.68630600000000E-02 / Declination. (degrees) PLATEID = 1560 / Plate Id TILEID = 9466 / Tile Id CARTID = 9 /Cartridge used in this plugging REDDEN = '0 0 0 0 0' / Median reddening vector for plate MAPID = 5330701 / Map Id NAME = '1560-53307-01' / Name of target; PlateId-MJD-Mapper Re PLUGMAPO= '/data/spectro/plugMapM/plPlugMapM-1560-53307-01.par' / plPlugMap load CAMERAS = 'b1 ' / camera ID in this exposure NGUIDE = 39 / Number of guider frames during exposure SEEING20= 1.12000 / 20% seeing during exposure (arcsec) SEEING50= 1.23000 / 50% seeing during exposure (arcsec) SEEING80= 1.37000 / 80% seeing during exposure (arcsec) RMSOFF20= 0.143178 / 20% RMS offset of guide fibers (arcsec) RMSOFF50= 0.228473 / 50% RMS offset of guide fibers (arcsec) RMSOFF80= 0.304631 / 80% RMS offset of guide fibers (arcsec) CAMCOL = 1 / CCD ID in this exposure COLBIN = 1 / Binning factor perpendicular to the c ROWBIN = 1 / Binning factor perpendicular to the r PROGRAM = 'binning 1 1 ' / Identifying name for CCD program AMPLL = 0 / which amp 0,1,2,3 corresponds to low AMPLR = 2 / which amp 0,1,2,3 corresponds to low AMPUL = 1 / which amp 0,1,2,3 corresponds to high AMPUR = 3 / which amp 0,1,2,3 corresponds to high SECFOCUS= 0.00000000000000E+00 / Secondary Mirror Position as reported GUIDEIMG= '/data/spectro/guider/gimg0464.fits' / Last archived guider image WTIME = 1.09955546000000E+09 / weatherData(timeStamp) AIRTEMP = 7.50000000000000E+00 / weatherData(airtemp) DEWPOINT= -2.5300000000000E+01 / weatherData(dewpoint) DEWDEP = 3.28000000000000E+01 / weatherData(dewpointDep) DUSTA = -9.9990000000000E+03 / weatherData(dusta) DUSTB = 2.50000000000000E+01 / weatherData(dustb) DUSTC = 9.26000000000000E+02 / weatherData(dustc) DUSTD = 1.90000000000000E+01 / weatherData(dustd) GUSTD = 1.37300000000000E+02 / weatherData(gustd) GUSTS = 6.00000000000000E+00 / weatherData(gusts) HUMIDITY= 7.60000000000000E+00 / weatherData(humidity) HUMIDOUT= 7.00000000000000E+00 / weatherData(humidout) PRESSURE= 2.15300000000000E+01 / weatherData(pressure) WINDD = 1.79200000000000E+02 / weatherData(windd) WINDS = 5.10000000000000E+00 / weatherData(winds) FFS = '0 0 0 0 0 0 0 0' / FlatField Screen 1:closed 0:open FF = '0 0 0 0 ' / FlatField Lamps 1:on 0:off NE = '0 0 0 0 ' / Ne Lamps 1:on 0:off HGCD = '0 0 0 0 ' / Hgcd Lamps 1:on 0:off SPEC1 = '1 0 1 1 ' / Dr_opn Dr_cls Latch Slithead (1:inpla SPEC2 = '1 0 1 1 ' / Dr_opn Dr_cls Latch Slithead (1:inpla TEMP01 = -9.3360000000000E+01 / CCD 01 Temperature TEMP02 = -9.4140000000000E+01 / CCD 02 Temperature TEMP03 = -9.2970000000000E+01 / CCD 03 Temperature TEMP04 = -9.2970000000000E+01 / CCD 04 Temperature CAMROW = 0 / AUTHOR = 'Scott Burles & David Schlegel' / VERSIDL = '6.3 ' / Version of IDL VERSUTIL= 'v5_2_0 ' / Version of idlutils VERSREAD= 'v5_3_3 ' / Version of idlspec2d for pre-processing raw dat VERS2D = 'v5_3_3 ' / Version of idlspec2d for 2D reduction VERSLOG = 'fermi-CVS 05/16/07' / Version of SPECLOG product VERSFLAT= 'v1_7 ' / Version of SPECFLAT product GAIN2 = 1.10000 / Gain in electrons per ADU RDNOISE2= 3.97710 / Readout noise in electrons GAIN3 = 1.05000 / Gain in electrons per ADU RDNOISE3= 2.96507 / Readout noise in electrons NBLEAD = 0 / Number of columns with blead trails PIXBIAS = 'pixbiasave-00001-b1.fits' / PIXFLAT = 'pixflatave-00001-b1.fits' / OPBC = 'opBC-51813.par' / OPCONFIG= 'opConfig-50000.par' / OPECALIB= 'opECalib-51577.par' / FRAMESN2= 9.10780207702 / XSIGMA = 1.05818 / WSIGMA = 1.03411 / PLUGFILE= 'plPlugMapM-1560-53307-01.par' / FLATFILE= 'sdR-b1-00029120.fit' / ARCFILE = 'sdR-b1-00029121.fit' / OBJFILE = 'sdR-b1-00029122.fit' / LAMPLIST= 'lamphgcdne.dat' / SKYLIST = 'skylines.dat' / HELIO_RV= 3.02849160012 / Heliocentric correction (added to velocities) VACUUM = T / Wavelengths are in vacuum SFLATTEN= T / Superflat has been applied PSFSKY = 3 / Order of PSF skysubtraction SKYCHI2 = 1.08588621061 / Mean chi^2 of sky-subtraction PREJECT = 0.200000 / Profile area rejection threshold LOWREJ = 5 / Extraction: low rejection HIGHREJ = 8 / Extraction: high rejection SCATPOLY= 0 / Extraction: Order of scattered light polynomial PROFTYPE= 3 / Extraction profile: 1=Gaussian NFITPOLY= 1 / Extraction: Number of parameters in each profil XCHI2 = 1.20984 / Extraction: Mean chi^2 BUNIT = '1E-17 erg/cm^2/s/Ang' /
Contains the estimated inverse variance (i.e., the inverse of the square of the estimated error) of the flux density of each spectrum, in units of (10^-17 erg/s/cm^2/Ang)^-2. It is set to zero (i.e., infinite error) for pixels with flags indicating that the data are unreliable.
XTENSION= 'IMAGE ' /Image Extension created by MWRFITS v1.4a BITPIX = -32 / NAXIS = 2 / NAXIS1 = 2048 / NAXIS2 = 320 / PCOUNT = 0 / GCOUNT = 1 /
XTENSION= 'IMAGE ' /Image Extension created by MWRFITS v1.4a BITPIX = 32 / NAXIS = 2 / NAXIS1 = 2048 / NAXIS2 = 320 / PCOUNT = 0 / GCOUNT = 1 /
Wavelength solution in log-10 Angstroms (vacuum)
XTENSION= 'IMAGE ' /Image Extension created by MWRFITS v1.4a BITPIX = -64 / NAXIS = 2 / NAXIS1 = 2048 / NAXIS2 = 320 / PCOUNT = 0 / GCOUNT = 1 /
Wavelength dispersion in units of (10^(-4) log-10 wavelength)^(-1) [FLOAT] (these are the same units as in the combined-spectrum spPlate file)
XTENSION= 'IMAGE ' /Image Extension created by MWRFITS v1.4a BITPIX = -32 / NAXIS = 2 / NAXIS1 = 2048 / NAXIS2 = 320 / PCOUNT = 0 / GCOUNT = 1 /
Plug-map structure from plPlugMapM file
XTENSION= 'BINTABLE' /Binary table written by MWRFITS v1.4a BITPIX = 8 /Required value NAXIS = 2 /Required value NAXIS1 = 178 /Number of bytes per row NAXIS2 = 320 /Number of rows PCOUNT = 0 /Normally 0 (no varying arrays) GCOUNT = 1 /Required value TFIELDS = 21 /Number of columns in table COMMENT COMMENT *** End of mandatory fields *** COMMENT * COMMENT *** Column names *** COMMENT TTYPE1 = 'OBJID ' / TTYPE2 = 'HOLETYPE ' / TTYPE3 = 'RA ' / TTYPE4 = 'DEC ' / TTYPE5 = 'MAG ' / TTYPE6 = 'STARL ' / TTYPE7 = 'EXPL ' / TTYPE8 = 'DEVAUCL ' / TTYPE9 = 'OBJTYPE ' / TTYPE10 = 'XFOCAL ' / TTYPE11 = 'YFOCAL ' / TTYPE12 = 'SPECTROGRAPHID ' / TTYPE13 = 'FIBERID ' / TTYPE14 = 'THROUGHPUT ' / TTYPE15 = 'PRIMTARGET ' / TTYPE16 = 'SECTARGET ' / TTYPE17 = 'OFFSETID ' / TTYPE18 = 'SCI_EXPTIME ' / TTYPE19 = 'CALIBFLUX ' / TTYPE20 = 'CALIBFLUX_IVAR ' / TTYPE21 = 'SFD_EBV ' / COMMENT COMMENT *** Column formats *** COMMENT TFORM1 = '5J ' / TFORM2 = '6A ' / TFORM3 = 'D ' / TFORM4 = 'D ' / TFORM5 = '5E ' / TFORM6 = 'E ' / TFORM7 = 'E ' / TFORM8 = 'E ' / TFORM9 = '16A ' / TFORM10 = 'D ' / TFORM11 = 'D ' / TFORM12 = 'J ' / TFORM13 = 'J ' / TFORM14 = 'J ' / TFORM15 = 'J ' / TFORM16 = 'J ' / TFORM17 = 'J ' / TFORM18 = 'E ' / TFORM19 = '5E ' / TFORM20 = '5E ' / TFORM21 = 'E ' /
Sky flux in units of 10^(-17) erg/s/cm^2/Ang
XTENSION= 'IMAGE ' /Image Extension created by MWRFITS v1.4a BITPIX = -32 / NAXIS = 2 / NAXIS1 = 2048 / NAXIS2 = 320 / PCOUNT = 0 / GCOUNT = 1 /
HDU for testing purposes only; please ignore.
XTENSION= 'IMAGE ' /Image Extension created by MWRFITS v1.4a BITPIX = -32 / NAXIS = 2 / NAXIS1 = 2048 / NAXIS2 = 320 / PCOUNT = 0 / GCOUNT = 1 /