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Data Header Keyword Definitions

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Keyword Sample Value Comment Description
SIMPLE T Fits standard
BITPIX -32 Bits per pixel -32 = 4-byte floating point
NAXIS 2 Number of axes
NAXIS1 2673 Axis length dispersion axis
NAXIS2 70 Axis length 1=spectrum, 2=sky+spectrum,3=sky
EXTEND F File may contain extensions
ORIGIN 'NOAO-IRAF FITS Image Kernel July 2003' FITS file originator
DATE '2006-03-01T15:19:47' Date FITS file was generated
IRAF-TLM '10:19:46 (01/03/2006)' Time of last modification
COMMENT FITS (Flexible Image Transport System) formt is defined in 'Astronomy
COMMENT and Astrophysics',volume 376, page 359; bibcode: 2001A&A...376..3559H
OBJECT '2M07073657+4602435' SET BY COMMENT FILE
RA '07:07:36.58' MEAN RA
DEC '46:02:43.4' MEAN DEC
EPOCH 2000 MEAN EQUINOX
ROTANGLE '090     ' ROT ANGLE
FASTFOC '970     ' FAST FOCUS
RRA '07:07:36.58' REQUESTED RA
RDEC '46:02:43.4' REQUESTED DEC
REPOCH 2000 REQUESTED EQUINOX
TRA '07:07:42.1 RA BY TELESCOPE
TDEC '+46:01:57.0 DEC BY TELESCOPE
TEPOCH 2000.000 EPOCH BY TELESCOPE
HA '+02:19:08' HA BY TELESCOPE
DATE-OBS '2006-03-01' UT YYY-MM-DD AT START OF EXPOSURE
UT '06:03:16' UT HH:MM:SS AT START OF EXPOSURE
UTEND '06:15:17' UT HH:MM:SS AT END OF EXPOSURE
AIRMASS 1.16 AIR MASS BY TELESCOPE
ST '09:27:23' TELESCOPE SIDEREAL TIME AT END
EXPTIME 720.004 INTEGRATION TIME, SECONDS
GJDN 2453795.75645 TOPCENTRIC JULIAN DAY AT MIDDLE OF EXPOSURE
HJDN 2453795.75925 HELIOCENTRIC JULIAN DAY AT MIDDLE OF EXPOSURE
GAIN 1.20 Gain(1), electrons per ADU, set by parameters
RDNOISE 8.6 Read Noise(1), electrons, set by parameters
RAMPROG0 'serial parallel skip 99 repeat 80 add 4 end skip 93 repeat 8'
RAMPROG0 'add 4 end'
OBSERVAT 'FLWO1 ' IRAF TYPE KEY
DISPAXIS 1 IRAF TYPE KEY
IMAGETYP 'OBJECT ' IRAF TYPE KEY object, flat, bias, dark.
OBSERVER 'P BERLIND ' observer(s)
P.I. 'Huchra ' Principal Investigator Name
PROGRAM '#141 Mapping the Nearby Univserse ' Program Name
APERTURE '3 ' arcsec
DISPERSE '300 ' gratting (lines/mm)
TILTPOS '600 ' tilt position
LOGNAME 'perry ' LOGIN NAME
INSTRUME 'FAST ' instrument name
DETECTOR 'thin_01 ' detector identifier
DRBUFOVF 0 INPUT FIFO OVERLFOW - NON-ZERO = BAD DATA!
SITENAME 'flwo1'
SITELONG '+110:52:39.0' LONGITUDE, DEGREES WEST OF ZERO
SITELAT '+31:40:51.4' LATITUDE, DEGREES
SITEELEV 2320.0 ELEVATON, METERS
TELESCOP 'TILLINGHAST' 1.5 m (60 inch) telescope
DISKDIR '/fast/flwo1/2006/02/28' ORIGINAL RAW DIRECTORY
DISKFILE 61 FILE NO. IN ORIGINAL RAW DIRECTORY
COMMENT Object: 2M07073657+4602435
COMMENT Observer: P Berlind
COMMENT P.I.: Huchra
COMMENT Program: #141 Mapping the Nearby Universe
COMMENT Seeing: 1-2"
COMMENT Aperture: 3
COMMENT Disperse: 300
COMMENT Tiltpos: 600
COMMENT Comment:
COMMENT Focus: 970
COMMENT Clouds: lost all over
FINDOBJ '38:44'
FINDBACK '10:35,48:57,63:70' from Quicklook - may or may not be present
FINDSPEC ' procdata.findspec 2.2a 28-Feb-2006 23:15 obj = 38:44' from Quicklook - may or may not be present

The following keywords are added by image data reduction tasks:

WCSDIM 3 Number of WCS dimensions
LTM1_1 1. see note 1
LTM1_2 1. see note 1
WAT0_001 'system=equispec' IRAF WCS
WAT1_001 'wtype-linear label=Wavelength units=angstroms' IRAF WCS
WAT2_001 'wtype-linear' IRAF WCS
FIXPIX 'Mar 1 10:19 Bad pixel file is badpix4.pl'
CCDSEC '[5:2677,6:75]' data section after image trimmed
CCDMEAN 73.21655
CCDMEANT 825675586
CCDPROC 'Mar 1 10:19 CCD processing done'
TRIM 'Mar 1 10:19 Trim data section is [5:2677,6:75]'
OVERSCAN 'Mar 1 10:19 Overscan section is [2695:2717,1:81] with mean=645.9997'
ZEROCOR 'Mar 1 10:19 Zero level correction image is zero'
FLATCOR 'Mar 1 10:19 Flat field image is norm with scale=1'
DCLOG1 'Transform' Reference wavelength calibration spectrum
DC-FLAG 0 Wavelength axis is linear, not log wavelength
CTYPE1 'LINEAR ' X-axis WCS is linear
CTYPE2 'LINEAR ' Y-axis WCS is linear
CRVAL1 3476.54223632812 WCS (wavelength) value at X-axis reference pixel
CRPIX1 1. X-axis WCS (wavelength) reference pixel
CD1_1 1.46894121170044 X-axis WCS units (Angstroms) per pixel
CD2_2 1. Y-axis WCS units (spectra) per pixel
HISTORY procdata.findspec 2.2a 28-Feb-2006 23:15 obj = 38:44
BANDID1 'spectrum - background fit, weights variance, clean yes'
BANDID2 'raw - background fit, weights none, clean no'
BANDID3 'background - background fit'
BANDID4 'sigma - background fit, weights variance, clean yes'
APNUM1 '1 0 32.00 39.00'
CTYPE3 'LINEAR '
CD3_3 1.
LTM3_3 1.
WAT3_001 'wtype=linear'
VELOCITY 5682.95229569052 Best redshift velocity in km/sec
Z 0.0189562857499454 Best redshift
CZERR 29.7334202046412 Redshift velocity error in km/sec
ZERR 9.91800001822634E-5 Redshift error
VELQUAL 'Q ' Velocity quality (_=not set, Q=good, X=bad, ?=uncertain) from rvsao.qplot
BCV -23.281608581543 Barycentric velocity correction in km/sec from rvsao.xcsao
CZXC 5682.95229569052 Best cross-correlation redshift velocity in km/sec from rvsao.xcsao
ZXC 0.0189562857499454 Best cross-correlation redshift from rvsao.xcsao
CZXCERR 25.6724809293096 Best cross-correlation redshift velocity error in km/sec from rvsao.xcsao
CZXCR 9.95683609617909 Best cross-correlation redshift R-value from rvsao.xcsao
BESTTEMP 'fabtemp97' Name of best cross-correlation template file from rvsao.xcsao
CZPARAMS '7 4096 1 5 20 250 500 0.05' rvsao.xcsao parameters: number of templates, number of log-wavelength pixels, zpad flag, 4 filter limits, apodization
XCTEMP1 'fabtemp97 5682.952 25.672 9.95684 0.455 368.727 5710.612 0.000 yes 0'
XCTEMP2 'ztemp 5657.932 23.931 7.62014 0.350 271.526 5683.628 0.000 yes 1'
XCTEMP3 'femtemp97 5681.463 16.106 7.84364 0.311 189.606 5705.060 0.000 no 3'
XCTEMP4 'fs2temp 5688.228 29.451 6.97068 0.384 308.778 5712.022 0.000 yes 0'
XCTEMP5 'fglotemp 5687.937 33.178 6.64375 0.403 333.615 5714.514 0.000 yes 0'
XCTEMP6 'fm32temp 5691.932 33.021 7.05591 0.404 349.376 5718.735 0.000 yes 0'
XCTEMP7 'fn7331temp 5662.130 31.278 7.37931 0.399 344.429 5673.537 0.000 yes'
XCSAO 'rvsao.xcsao 2.4.8 01-Mar-2006 10:43 CZXC = 5682.95 R = 9.96'
QPLOT 'rvsao.xcsao 2.4.8 01-Mar-2006 10:43 VELOCITY = 5682.95 Q = Q'
COMMENT 19 blank lines
END



Note 1
The image coordinate system (Ic,Il) refers to the recorded image pixel array. The image array may include other information such as overscan and prescan. Thus the actual data pixels from the CCD may occupy only a region of the image. However the image coordinate system begins with (1,1) for the first pixel in the image. The first data pixel will begin with some coordinate (Ic1,Il1). The data pixels then increment by one for each "binned" pixel. As with the amplifier coordinate system the general linear coordinate transformation between the CCD and image coordinates is given by:
Ic = LTM1_1 * Cx + LTM1_2 * Cy + LTV1
Il = LTM2_1 * Cx + LTM2_2 * Cy + LTV2
Cx = ( LTM2_2 * (Ic - LTV1) - LTM1_2 * (Il - LTV2)) / (LTM1_1 * LTM2_2 - LTM1_2 * LTM2_1)
Cy = (-LTM2_1 * (Ic - LTV1) + LTM1_1 * (Il - LTV2)) / (LTM1_1 * LTM2_2 - LTM1_2 * LTM2_1)