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Hectospec
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Hectospec
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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 | 4505 | Axis length | dispersion axis | |
| NAXIS2 | 3 | Axis length | 1=spectrum, 2=sky+spectrum,3=sky | |
| EXTEND | F | File has no extensions | ||
| ORIGIN | 'NOAO-IRAF FITS Image Kernel December 2001' | FITS file originator | ||
| IRAF-TLM | '16:16:11 (31/08/2004)' | Time of last IRAF modification | ||
| DATE | '2004-08-30T21:06:17' | Time file was created | ||
| OBJECT | 'F2.20.bg 1 306' | Name of the object observed, added from APID[APERTURE] | ||
| SERIALID | '8351-7-5' | |||
| FILENAME | 'SPEC/2004.0413/F2.20.bg_1.0420' | Name of one of original FITS files | Multiple exposures were combined to make the image from which this spectrum was extracted. See IMCMBnnn below. | |
| DETSIZE | '[1:4098,1:4800]' | Limiting dimensions of detectors in pixels | ||
| NAMPS | 4 | Number of amplifiers reading from detectors | ||
| CCDSEC | '[1:1024,1:4608]' | First amplifier limits in pixels | ||
| ORIGSEC | '[1:1024,1:4608]' | First amplifier limits in pixels | ||
| AMPNAME | 'ampid 1-1' | Name of first amplifier | ||
| IMAGEID | '1' | Amplifier ID | ||
| GAIN | 2.0000000 | Gain, electrons per ADU | ||
| RDNOISE | 5.0000000 | Noise, electrons | ||
| DETSEC | '[1:1024,97:4704]' | Detector data section | Mapping of the CCD section to detector coordinates | |
| DTV1 | 0.0000000 | Detector transformation vector | The final coordinate system is the detector coordinate system (Dx,Dy). This is important when multiple amplifiers and/or multiple CCDs are used. The detector coordinate system describes a single pixel raster of "unbinned" CCD pixels into which the multiple CCD/amplifier pixels are mapped to make a single, simple picture. It is used for displaying (and possibly processing) multiple amplifier/multiple CCD data in a consistent fashion with offsets, flips and transposes between the image pixels accounted for.
Dx = DTM1_1 * Cx + DTM1_2 * Cy + DTV1 Dy = DTM2_1 * Cx + DTM2_2 * Cy + DTV2 Cx = ( DTM2_2 * (Dx - DTV1) - DTM1_2 * (Dy - DTV2)) / (DTM1_1 * DTM2_2 - DTM1_2 * DTM2_1) Cy = (-DTM2_1 * (Dx - DTV1) + DTM1_1 * (Dy - DTV2)) / (DTM1_1 * DTM2_2 - DTM1_2 * DTM2_1) See the NOAO website for more details. |
|
| DTV2 | 96.0000000 | Detector transformation vector | ||
| DTM1_1 | 1.0000000 | Detector transform matrix | ||
| DTM2_2 | 1.0000000 | Detector transform matrix | ||
| SECPIX1 | 0.0800000 | arc-seconds per pixel | At center of image along first (dispersion) axis | |
| LTM1_1 | 1.0000000 | Image transform matrix |
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) | |
| LTM2_2 | 1.0000000 | Image transform matrix | ||
| ATM1_1 | 1.0000000 | Amplifier transform matrix |
The amplifier coordinate system (As,Ap) is based on the order in which
pixels are read. The the serial coordinate is As and the parallel coordinate
is Ap. The coordinates begin with one for the first CCD pixel (actual charge
well) that the controller records or uses in binning and increments by one
for each "unbinned" pixel. If the controller always skips some initial
columns or lines which are never used (such as for transient settling)
then these are not counted. Prescan pixels which are recorded with the
image data will have amplifier coordinates less than one. The general
linear transformation between the amplifier and CCD coordinates is given by
As = ATM1_1 * Cx + ATM1_2 * Cy + ATV1 Ap = ATM2_1 * Cx + ATM2_2 * Cy + ATV2 Cx = ( ATM2_2 * (As - ATV1) - ATM1_2 * (Ap - ATV2)) / (ATM1_1 * ATM2_2 - ATM1_2 * ATM2_1) Cy = (-ATM2_1 * (As - ATV1) + ATM1_1 * (Ap - ATV2)) / (ATM1_1 * ATM2_2 - ATM1_2 * ATM2_1) See the NOAO website for more details. |
|
| ATM2_2 | 1.0000000 | Amplifier transform matrix | ||
| ATV1 | 0.0000000 | Amplifier transform vector | ||
| ATV2 | 0.0000000 | Amplifier transform vector | ||
| VRGlo | -8.8860000 | HK value for CCD controller | ||
| VRGhi | 2.9930000 | HK value for CCD controller | ||
| VSlo | -7.8950000 | HK value for CCD controller | ||
| VShi | 1.9850000 | HK value for CCD controller | ||
| VPlo | -8.8870000 | HK value for CCD controller | ||
| VPhi | 0.9920000 | HK value for CCD controller | ||
| VOG1 | -5.9130000 | HK value for CCD controller | ||
| VOG2 | -4.9260000 | HK value for CCD controller | ||
| VRD | 7.9710000 | HK value for CCD controller | ||
| VDD | 14.9080000 | HK value for CCD controller | ||
| VODL | 19.8660000 | HK value for CCD controller | ||
| VTemp | -119.8200000 | HK value for CCD controller | ||
| DEWTEMP | -900.0000000 | |||
| CCDSIGNM | '/sbin/hecsc.bin' | ccdsignal file | ||
| CCDGAIN | 'UNDEFINED' | CCD gain state | ||
| CAMGAIN | 'UNDEFINED' | camera gain state | ||
| CCDTEMP | -119.8200000 | CCD temperature in degrees Celsius | ||
| CCDOVERR | 0 | CCD controller buffer overruns | ||
| CCDLOSTB | 0 | CCD controller lost buffers | ||
| CCDTMOUT | 1 | CCD controller timeouts | ||
| OBSERVAT | 'mmto ' | observatory | IRAF abbreviation | |
| OBSERVER | 'dgf, nc, mk, mc ' | observers | ||
| PROPID | 'Engineering ' | observing proposal ID | ||
| PI | 'dgf ' | Principal Investigator | ||
| EXPTIME | 1200. | actual integration time, seconds | ||
| DARKTIME | 1200. | total elapsed time, seconds | ||
| IMAGETYP | 'OBJECT ' | object, flat, bias, etc. | ||
| DATE-OBS | '2004-04-13T04:16:47' | UT date/time of start of exposure | ||
| UT | '04:16:47 ' | universal time of start of exposure | ||
| ST | '10:20:01.041 ' | sidereal time of start of exposure | ||
| MJD | 53108.17833 | modified Julian Date of start of exposure | ||
| RA | '9:21:03.218' | right ascension (hh:mm:ss) | ||
| DEC | '30:42:19.764' | declination (dd:mm:ss) | ||
| EQUINOX | 2000.0 | equinox of RA and Dec | ||
| EPOCH | 2000.0 | same as EQUINOX (for back compat.) | ||
| AIRMASS | 1.026 | airmass | ||
| ROTANGLE | '10.27660791 ' | rotation angle, degrees | ||
| TELFOCUS | '15057.350 ' | telescope focus | ||
| TELESCOP | 'mmt_f5_adc ' | telescope name | ||
| DETECTOR | 'specs ' | detector name | ||
| ALTTIMIN | 0 | alttiming, milli-seconds | ||
| DWELL | 15 | sample integration time, microseconds | ||
| NSCANROW | 1 | number of CCD rows scanned | ||
| CCDSUM | '1 1 ' | on chip summation | ||
| INSTRUME | 'spec ' | instrument name | ||
| DISPERSE | '270_gpm ' | disperser | ||
| TILTPOS | '-1.92600 ' | tilt position | ||
| INSFOCUS | '0.86995 ' | instrument focus | ||
| COMMENT | Data taken with the Hectospec multifiber spectrograph | |||
| COMMENT | Built at SAO and operated at the MMT f/5 Focus | |||
| COMMENT | STU Preform Polymicro Fibers are 250u or 1.5arcs at focal plane | |||
| CIFOCUS | '0.8700 ' | commanded focus position | ||
| CTILTPOS | '-1.9260 ' | commanded tiltpos | ||
| POSANGLE | 70.486 | telescope position angle | ||
| HA | '+00:59:34.248 ' | hour angle | ||
| INSTAZ | '0.00000000 ' | instrument azimuth offset(arcsec) | ||
| INSTEL | '0.00000000 ' | instrument elevation offset(arcsec) | ||
| PARANGLE | '80.7628085 ' | telescope parallactic angle(degrees) | ||
| CAT-ID | '4_12_20_37_50 ' | telescope catalog obj name | ||
| CAT-RA | '9:20:11.359 ' | telescope catalog ra (hours) | ||
| CAT-DEC | '30:31:02.739 ' | telescope catalog dec (degrees) | ||
| CORRCTOR | 'Wide-Field Correct' | telescope corrector | ||
| ADC | 'SAO ADC ' | ADC identifier | ||
| HPROC | 2004-Jul-16 12:34 fixpix, overscan, and trim | HPROC output | ||
| PREAMPFX | 2004-Jul-16 12:34 preamplifier correction made | HPROC output | ||
| TRIM | Jul 16 12:34 Trim is [51:1074,3:4610] | |||
| FIXPIX | Jul 16 12:34 Fix mscdb$sao/mmto/mmt/spec/badpix1.pl + sat + bleed | |||
| OVERSCAN | Jul 16 12:34 Overscan is [1080:1120,3:4610], mean 2490.28 | |||
| CCDPROC | Jul 16 12:34 CCD processing done | |||
| GAINCORR | 1. | Gain correction in CCDPROC | ||
| IMCMB001 | 'F2.20.bg_1.0420.fits[1]' | HCOMBINE first image | ||
| IMCMB002 | 'F2.20.bg_1.0422.fits[1]' | HCOMBINE second image | ||
| IMCMB003 | 'F2.20.bg_1.0424.fits[1]' | HCOMBINE third image | ||
| NCOMBINE | 3 | Number of images combined | ||
| HMERGE | 2004-Jul-16 13:31 4 amplifiers merged into one image | Written by hectospec.hmerge task | ||
| HNORM | 2004-Jul-16 16:30 pixels normalized by flat.fits | Written by hectospec.hnorm task | ||
| JD | 2453108.685266 | Julian date of observation midtime | ||
| LJD | 2453108. | Integer Julian Date | ||
| CTYPE1 | 'LINEAR ' | X-axis WCS is linear | ||
| CTYPE2 | 'LINEAR ' | Y-axis WCS is linear | ||
| CD1_1 | 1.21003552397869 | X-axis WCS units (Angstroms) per pixel | ||
| CD2_2 | 1 | Y-axis WCS units (spectra) per pixel | ||
| CDELT1 | 1.21003552397869 | X-axis WCS units (anstroms) per pixel | ||
| CDELT2 | 1. | X-axis WCS units (anstroms) per pixel | ||
| HEXTRACT | '2004-Jul-16 16:31 extracted from F2.20.bg_1.fits' | Written by hectospec.hextract | ||
| HEXAPREF | 'dome ' | Aperature reference file used by HEXTRACT | ||
| HEXAPMAP | 'F2.20.bg_1_map' | Aperture map file used by HEXTRACT | ||
| DCLOG1 | 'REFSPEC1 = comp.ms' | Reference wavelength calibration spectrum | ||
| DC-FLAG | 0 | Wavelength axis is linear, not log wavelength | ||
| CRPIX1 | 1. | X-axis WCS (wavelength) reference pixel | ||
| CRVAL1 | 3700. | WCS (wavelength) value at X-axis reference pixel | ||
| NP1 | 1 | First X pixel to which WCS applies | ||
| INTERP | 'wavelength interpolated ' | |||
| HISTORY | rvsao.sumspec 2.3.5 run 16-Jul-2004 16:32 | |||
| FIBRGEOM | 2004-Jul-16 16:35 geometric correction made | Written by hectospec.htran | ||
| FIBRTRAN | 2004-Jul-16 16:35 fiber throughput corrected: 10 order spline3 | Written by hectospec.htran | ||
| FIBRFILE | 'tpc_dome.ms' | File used for throughput correction | ||
| WCSDIM | 2 | Number of WCS dimensions | ||
| FIELD | 'F2.20.bg_1' | Name of field which includes this object | ||
| TYPE | ' ' | |||
| TRA | '+09:20:11.36' | Right ascension of optical axis | ||
| TDEC | '+30:31:02.74' | Declination of optical axis | ||
| TEPOCH | 2000 | Equinox of optical axis (J assumed) | ||
| FIBER | 248 | Fiber number | ||
| APRANGE | '0:0 ' | meaningless | ||
| FIBER_X | 49.148 | Fiber X coordinate on focal plane | ||
| FIBER_Y | -151.72 | Fiber Y coordinate on focal plane | ||
| CATNAME | 'name ' | Name of catalog with fiber sky position | ||
| CATNUM | 306 | Number of entry in catalog | ||
| APERTURE | 125 | Aperture number (sequential on detector) | ||
| CATOBJ | 'target ' | Name of object from catalog | ||
| SPECNUM | 125 | Number of spectrum in extracted 2-D file | ||
| APNUMnnn | '125 0 125 125' | Aperture 0=sky/2=nonsky Aperture Aperture | ||
| APIDnnn | '130628 08:40:8.9450 45:30:59.9170 0 42 184.462 155.069' | Catalog_number RA Dec -5000=TOI/0=program fiber xfib yfib | ||
| HABSKY | '2004-Aug-30 16:06 hectospec$lib/skyabs.fits divided out' | Added by hectospec.habsky | ||
| DISPAXIS | 1 | Dispersion axis (1=X) | ||
| WAT0_001 | 'system=equispec' | IRAF WCS | ||
| WAT1_001 | 'wtype=linear label=Wavelength units=angstroms' | IRAF WCS | ||
| WAT2_001 | 'wtype=linear' | IRAF WCS | ||
| NSKYFIB | 5 | Number of sky fibers used by hectospec.skyproc | ||
| SKYFIB | '244_267_279_264_222_' | Sky fibers used for background removal | ||
| SKYAPER | '27+28+104+114+143' | Sky apertures used for background removal | ||
| SKYCERT | 4 | Maximim R-value for skies correlated against template for hectospec.skyproc | ||
| NSKYMAX | 5 | Maximum number of sky fibers usable by hectospec.skyproc | ||
| SKYDIST | 0 | If nonzero, only use fibers closer than this in focal plane | ||
| SKYMETHD | 'SKYSUB ' | Sky subtraction method is hectospec.skyproc | ||
| SKYRATIO | 0.970260 | Scale factor from object sky lines to mean sky lines in hectospec.skyproc | ||
| SKYSTDLM | 0.2 | Reject sky spectra with RMS > 0.2 from mean sky RMS in hectospec.skyproc | ||
| VELOCITY | 47328.1914967525 | Best redshift velocity in km/sec | ||
| CZERR | 16.4119728769627 | Redshift velocity error in km/sec | ||
| BCV | -27.0360641479492 | Barycentric velocity correction in km/sec from rvsao.xcsao | ||
| CZXC | 47328.0782493144 | Best cross-correlation redshift velocity in km/sec from rvsao.xcsao | ||
| CZXCERR | 7.30550220240955 | Best cross-correlation redshift velocity error in km/sec from rvsao.xcsao | ||
| CZXCR | 16.6141650060873 | Best cross-correlation redshift R-value from rvsao.xcsao | ||
| BESTTEMP | 'hemtemp0' | Name of best cross-correlation template file from rvsao.xcsao | ||
| CZPARAMS | '4 4096 1 5 10 100 200 0.05' | rvsao.xcsao parameters: number of templates, number of log-wavelength pixels, zpad flag, 4 filter limits, apodization | ||
| COMMENT | Template information from rvsao.xcsao: | |||
| COMMENT | file name, cross-correlation velocity, error, R-value | |||
| COMMENT | correlation peak height (0-1) and width (km/sec) | |||
| COMMENT | velocity relative to template, template BCV | |||
| COMMENT | template em. chopped, template filtered | |||
| XCTEMP1 | 'hemtemp0 47328.078 7.306 16.6142 0.661 172.065 47358.835 0.000 0 3' | |||
| XCTEMP2 | 'habtemp90 47390.822 95.386 2.73766 0.193 481.738 57253.165 0.000 0 3' | |||
| XCTEMP3 | 'femtemp97 47329.947 8.079 16.0382 0.666 184.104 47361.315 0.000 0 3' | |||
| XCTEMP4 | 'fabtemp97 47504.457 114.344 2.17596 0.177 475.139 47534.421 0.000 0 ' | |||
| XCSAO | 'rvsao.xcsao 2.3.7 30-Aug-2004 16:41 CZXC = 47328.08 R = 16.61' | |||
| VELQUAL | '_ ' | Velocity quality (_=not set, Q=good, X=bad, ?=uncertain) from rvsao.qplot | ||
| QPLOT | 'rvsao.xcsao 2.3.5 16-Jul-2004 17:45 VELOCITY = 47430.28 Q = Q' | |||
| CZEM | 47328.7485072547 | Emission line velocity in km/sec from rvsao.emsao | ||
| CZEMERR | 16.2019607110046 | Emission line velocity error in km/sec from rvsao.emsao | ||
| CZEMNL | 10 | Number of emission lines found by rvsao.emsao | ||
| CZEMNLF | 8 | Number of emission lines fit by rvsao.emsao | ||
| COMMENT | Emission line information from rvsao.emsao: | |||
| COMMENT | line name, rest wavelength, observed wavelength | |||
| COMMENT | line height, line width, redshift (km/sec), redshift error (km/sec) | |||
| COMMENT | equivalent width, weighting factor | |||
| EMLINE1 | 'OII 3727.30 4316.45 152.06 2.8951 47386.15 14.56 1103.48 0.033' | |||
| EMLINE2 | 'Hg 4340.50 5025.82 44.999 2.1767 47334.41 35.10 245.52 0.006' | |||
| EMLINE3 | 'Hb 4861.33 5629.04 204.08 2.5295 47343.62 4.89 1293.98 0.288' | |||
| EMLINE4 | 'OIII 5006.84 5797.94 63.244 4.1075 47368.22 22.82 651.16 0.013' | |||
| EMLINE5 | 'OI 6300.23 7297.30 0.0000 0.0000 0.00 0.00 0.00 0.000' | |||
| EMLINE6 | 'N1 6548.06 3700.00 0.0000 0.0000 -130393.89 0.81 0.00 0.000' | |||
| EMLINE7 | 'Ha 6562.82 7599.53 637.70 2.8218 47357.47 6.96 4510.63 0.142' | |||
| EMLINE8 | 'N2 6583.57 7623.62 218.02 3.7515 47360.24 3.72 2050.23 0.497' | |||
| EMLINE9 | 'S1 6716.44 7777.02 92.506 2.7575 47339.64 28.91 639.41 0.008' | |||
| EMLINE10 | 'S2 6730.81 7794.29 84.108 2.4362 47367.40 22.78 513.61 0.013' | |||
| EMSAO | 'rvsao.emsao 2.3.7 31-Aug-2004 16:16 CZEM = 47328.75 LINES = 8' | |||
| END | ||||