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J/ApJS/174/136      GEMS survey data and catalog             (Caldwell+, 2008)

GEMS survey data and catalog. Caldwell J.A.R., McIntosh D.H., Rix H.-W., Barden M., Beckwith S.V.W., Bell E.F., Borch A., Heymans C., Haussler B., Jahnke K., Jogee S., Meisenheimer K., Peng C.Y., Sanchez S.F., Somerville R.S., Wisotzki L., Wolf C. <Astrophys. J. Suppl. Ser., 174, 136-144 (2008)> =2008ApJS..174..136C (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Morphology Keywords: galaxies: evolution - galaxies: structure - surveys Abstract: We describe the data reduction and object cataloging for the GEMS survey, a large-area (800 arcmin2) two-band (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope, centered on the Chandra Deep Field-South. Description: The GEMS collaboration was granted 125 orbits HST time during cycle 11 (GO-9500, PI: Rix) to image a large area centered on the Extended Chandra Deep Field-South [E-CDF-S; α, δ (J2000.0) = 03:32:25, -27:48:50 using the ACS Wide-field Camera (WFC). We produced a master catalog, which incorporates the GEMS and COMBO-17 information for the 8565 cross-identified objects. This master catalog was used for the GEMS science completed to date (see Sect. 1). A small number of objects were found to be excludable from the GEMS science sample due to being, e.g., stars (72), too near the survey edge (33), or spoiled by the interchip gap (62). These sources are noted in the master catalog. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file gemstot.dat 253 41681 GEMS total source catalog (all sources detected in the GEMS z850 imaging, (hprototot.cat.dp) gemsr24.dat 404 8565 GEMS master catalog of sources cross correlated with COMBO-17 (Wolf et al., 2008, Cat. II/253) (hprotor24.cat.dp)
See also: II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008) J/ApJS/172/615 : GALFIT result for GEMS galaxies (Haussler+, 2007) Byte-by-byte Description of file: gemstot.dat
Bytes Format Units Label Explanations
2- 24 A23 --- GEMS GEMS sexagesimal coordinate-based name (GEMSzHHMMSS.sspDDMMSS.s) 26- 35 F10.7 deg RAdeg Right ascension (J2000) 38- 48 F11.7 deg DEdeg Declination (J2000) 50- 58 I9 ct Ftot Total flux in F850LP band (SExtr. FLUX_BEST) 60- 65 I6 ct e_Ftot Error on total flux 68- 73 F6.3 mag mtot Total magnitude in F850LP band (SExtr. MAG_BEST12) 76- 80 F5.3 mag e_mtot Error total magnitude 83- 87 F5.2 --- bck "local" background level 90- 95 I6 pix+2 Area Isophotal area (SExtr. ISOAREA_IMAGE) 98-103 F6.1 pix xpos Image center x coordinate 105-110 F6.1 pix ypos Image center y coordinate 112-116 F5.1 deg PA [] Position angle (SExtr. THETA_IMAGE) 119-123 F5.3 --- Ell Ellipticity 126-130 F5.1 pix FWHM Image FWHM 133-134 I2 --- Flag SExtractor FLAGS 137-140 F4.2 --- S/G [0/1] Stellarity parameter (SExtr. CLASS_STAR) 148-157 A10 --- ACSs ACS source image name 162-174 A13 --- ACSm ACS mask image names 178-181 I4 s TExp Exposure time 184-189 F6.3 mag ABmag0 AB-mag zero point for F850LP band 194-197 F4.2 --- rKron SExtractor Kron aperture radius 200-208 E9.4 --- Cxx SExtractor object ellipse parameter Cxx 210-218 E9.4 --- Cyy SExtractor object ellipse parameter Cyy 220-229 E10.4 --- Cxy SExtractor object ellipse parameter Cxy 232-233 A2 --- --- [na] 239-240 A2 --- --- [na] 246-247 A2 --- --- [na] 252-253 I2 --- Nover Number of overlapping sources
Byte-by-byte Description of file: gemsr24.dat
Bytes Format Units Label Explanations
2- 24 A23 --- GEMS GEMS sexagesimal coordinate-based name (GEMSzHHMMSS.sspDDMMSS.s) 26- 35 F10.7 deg RAdeg Right ascension (J2000) 38- 48 F11.7 deg DEdeg Declination (J2000) 51- 58 I8 ct Ftot Total flux in F850LP band (SExtr. FLUX_BEST) 60- 65 I6 ct e_Ftot Error on total flux 68- 73 F6.3 mag mtot Total magnitude in F850LP band (SExtr. MAG_BEST12) 76- 80 F5.3 mag e_mtot Error total magnitude 83- 87 F5.2 --- bck "local" background level 90- 95 I6 pix+2 Area Isophotal area (SExtr. ISOAREA_IMAGE) 98-103 F6.1 pix xpos image center x coordinate 105-110 F6.1 pix ypos image center y coordinate 112-116 F5.1 deg PA [] Position angle (SExtr. THETA_IMAGE) 119-123 F5.3 --- Ell Ellipticity 126-130 F5.1 pix FWHM Image FWHM 133-134 I2 --- Flag SExtractor FLAGS 137-140 F4.2 --- S/G [0/1] Stellarity parameter (SExtr. CLASS_STAR) 148-157 A10 --- ACSs ACS source image name 162-174 A13 --- ACSm ACS mask image names 178-181 I4 s TExp Exposure time 184-189 F6.3 mag ABmag0 AB-mag zero point for F850LP band 192-196 F5.3 --- MCz COMBO-17 redshift 199-203 F5.3 arcsec sepAC Angular separation between ACS and COMBO-17 coordinates 206-211 F6.3 mag Rmag Total R-band magnitude from COMBO-17 (SExtr. MAG_BEST) 214-215 I2 --- Nover Number of overlapping sources 218-223 F6.1 pix Xpos Visual-band image x coordinate 226-231 F6.1 pix Ypos Visual-band image y coordinate 236-239 F4.2 pix rKron SExtractor Kron aperture radius 242-250 E9.4 --- Cxx SExtractor object ellipse parameter Cxx 252-260 E9.4 --- Cyy SExtractor object ellipse parameter Cyy 262-271 E10.4 --- Cxy SExtractor object ellipse parameter Cxy 274-278 I5 ---- COMBO-17 COMBO-17 object number (Seq) 281-285 F5.3 --- e_MCz COMBO-17 redshift uncertainty 288-292 F5.3 --- MCzml COMBO-17 peak of redshift-estimate distribution 296-301 F6.1 Mpc dl COMBO-17 luminosity distance 304-310 F7.3 mag UjMAG COMBO-17 Johnson absolute U VEGA-magnitudes 313-319 F7.3 mag VjMAG COMBO-17 Johnson absolute V VEGA-magnitudes 322-328 F7.3 mag BjMAG COMBO-17 Johnson absolute B VEGA-magnitudes 331-337 F7.3 mag rsMAG COMBO-17 SDSS absolute r magnitude 340-344 F5.3 mag e_Rmag COMBO-17 R-band SExtr. MAG_BEST uncertainty 347-351 F5.3 mag e_UjMAG COMBO-17 M_U mag uncertainties 354-358 F5.3 mag e_VjMAG COMBO-17 M_V mag uncertainties 361-365 F5.3 mag e_BjMAG COMBO-17 M_B mag uncertainties 368-372 F5.3 mag e_rsMAG COMBO-17 M_r mag uncertainty 376 I1 --- Phot COMBO-17 photometry flag (1) 379-384 F6.3 mag ApRmag COMBO-17 aperture Rmag 387-392 F6.3 mag/arcsec2 SuBrR COMBO-17 R-band central surface brightness 394-404 A11 --- Notes Notes
Note (1): Flags to be read as bits (from right to left): * bits 0-7 (corresponding to values 0-128) are original SExtractor flags, * bits 9-11 (corresponding to values 512-2048) set by COMBO-17 photometry: * bit 9 indicates only potential problem from bright neighbours or reflexes from the optics (check images); * bit 10 indicates uncorrected hot pixels, * bit 11 is set interactively when photometry is erroneous
History: Copied at ftp://archive.stsci.edu/pub/hlsp/gems
(End) Patricia Vannier [CDS] 11-Jun-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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