Follow UsFUSE FITS Keywords
References and comments on FITS keywords are listed below. See main page for background.
| Keyword | Reference(s) | Comments/Notes |
|---|---|---|
| GENERAL KEYWORDS | ||
| EXTNAME | See FITS standards document | FITS convention for naming table extension (i.e., 'spectral container') |
| EQUINOX | from EQUINOX keyword, see Dixon et al 2007, PASP, 119, 527 | Comments here |
| RADECSYS | HST Guide Star Catalog (Lasker et al. 1990, AJ, 99, 2019) | Comments here |
| TIMESYS | Dixon et al. 2007, PASP, 119, 527 | UTC Time system |
| MJDREF | 0.00000 | [d] MJD zero point for times |
| SPECSYS | Dixon et al. 2007, PASP, 199, 527 | Heliocentric reference frame |
| VOCLASS | 'SPECTRUM V1.0' | VO Data Model |
| VOSEGT | 'SPECTRUM' | Segment type |
| DATALEN | derived from data | [ ] Number of points in spectrum |
| DSSOURCE | 'POINTED' | Survey or Pointed |
| DATA ID KEYWORDS | ||
| DATE | from PROCDATE keyword | Processing-Creation Date |
| VODATE | from IDL "today" command | Curation Date |
| VOREF | 'http://archive.stsci.edu/vodoc/fuse' | URL for this Documentation |
| DS_IDENT | 'ads/sa.fuse#a088010100000nvo4ttagfcal' | Data Set Identifier |
| VERSION | '1.0' | Processing Version |
| COLLECT | 'FUSE/FUV' | Data Set Collection |
| INSTRUME | from INSTRUME keyword | Instrument |
| TELESCOP | 'FUSE' | Telescope |
| FILENAME | derived from FILENAME keyword | File Name |
| CR_IDENT | derived from FILENAME keyword | Internal dataset ID |
| CRETYPE | 'Archival' | Not an on-the-fly dataset |
| CURATION KEYWORDS | ||
| VOPUB | 'MAST' | VO Publishing Authority |
| AUTHOR | 'FUSE project' | Creator |
| VOPUBID | 'ivo://mast.stsci.edu' | URI for VO Publisher |
| VOLOGO | 'http://archive.stsci.edu/images/100.mastlogo.gif' | MAST logo |
| VOVER | '1.0' | VO Curation version |
| VORIGHTS | 'PUBLIC' | Data is public |
| CONTRIB1 | from PRGRM_ID keyword. See http://fuse.pha.jhu.edu/FUSE_obs_programs.html | Program ID |
| CONTACT | 'archive help desk' | general help desk |
| 'archive@stsci.edu' | Send questions here | |
| TARGET KEYWORDS | ||
| OBJECT | from FUSE keyword TARGNAME | proposer's target name |
| SRCCLASS | derived from OBJCLASS keyword | Object Class |
| SRTYPE | from SP_TYPE keyword | Spectral Type |
| REDSHIFT | from Z keyword | [ ] Target redshift. If unknown, no value was listed in file. |
| VRAD_OBS | derived from Z keyword. This value was supplied by the program GO and hence has an uncertain origin and reference frame. | [km/s] Radial velocity |
| TITLE | derived from data set name and target name | Program Identification |
| RA_TARG | from RA_TARG keyword | [deg] right ascension of target |
| DEC_TARG | from DEC_TARG keyword | [deg] declination of target |
| WCS Paper 3 Keywords | ||
| 1S2_1 | 'WAVE' | Column name with spectral coordinates |
| 1CYTP2 | 'WAVE-TAB' | Spectral coordinate is wavelength |
| 1S3_1 | 'WAVE' | Column name with spectral coordinates |
| 1CYTP3 | 'WAVE-TAB' | Spectral coordinate is wavelength |
| COVERAGE: SPATIAL | ||
| RA | from RA_TARG keyword | [deg] project-defined right ascension |
| DEC | from DEC_TARG keyword | [deg] project-defined declination |
| APERTURE | derived from APERTURE keyword. See FUSE Observer's Guide Sect. 2.3 http://fuse.pha.jhu.edu/support/guide/FOG_4.0_edited.html) | [arcsec] radius or lengthxwidth LWRS (30x30, MDRS (4x20), HIRS (1.25x20, seldom used), pinhole: (0.5, seldom used) |
| COVERAGE: TEMPORAL | ||
| DATE-OBS | derived from TIMEOBS and DATEOBS keywords | UT observation start time |
| EXPOSURE | from OBSTIME keyword | [s] eff. exposure duration |
| TSTART | from OBSSTART keyword | [d] MJD exposure start time |
| TSTOP | from OBSEND keyword | [d] MJD exposure stop time |
| TMID | derived from OBSSTART and OBSEND keywords | [d] MJD exposure mid time |
| COVERAGE: SPECTRAL | ||
| SPECSDIM | '1.0E-10 L' | Comments here |
| SPEC_CAL | Calibrated spectral coordinate | |
| SPEC_ERR | Dixon et al. 2007, PASP, 119, 527 section 5.1 quotes a value of 0.15 Angstroms; 42 km/sec at 1100 Angstroms as an upper limit for the typically used LWRS aperture. Since this may be interpreted as a 3-sigma value (J. Kruk, priv. commun., 2007) MAST gives 14 km/sec | 14 km/s Wavelength statistical error |
| SPECBAND | See http://archdev.stsci.edu/genlinks_help.html#data for defining wavelength regions | Spectral Band(s) |
| SPEC_VAL | derived value | [angstrom] Mean Wavelength |
| SPEC_BW | derived value | [angstrom] Bandpass Width Wmax - Wmin |
| SPEC_FIL | nvo merged spectra are continuous | 1.0 No gaps between points |
| SPEC_RP | FUSE Observer's Guide Sect. 2.4.3 http://fuse.pha.jhu.edu/support/guide/FOG_4.0_editted.html | Resolving power W/dW 20,000 (LWRS aperture) but depends on detector segment (e.g., lower for LIF 2B) |
| COVERAGE: OBSERVABLE | ||
| FLUXSDIM | '1.0E+7 ML-1T-3' | Comments here |
| FLUX_CAL | Calibrated Fluxes | |
| SYS_ERR | Van Dixon, private communication | [ ] flux sys error typically 5-10 percent |
| DER_SNR | Stoehr et al. 2007 Space Tele. Coord. Fac. NL, 42, 4 | [ ] Derived signal-to-noise ratio |
| FLUXAVG | derived from data | [erg/cm**2/s/angstrom] Average Flux |
| FLUXMAX2 | derived from data | [erg/cm**2/s/angstrom] 98% Maximum Flux |
| SPECDISP | derived from data ((Wmax-Wmin)/npts) | [angstrom/pixel] Dispersion |
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