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II/350              VLT Survey Telescope ATLAS                   (Shanks+, 2015)

The VLT Survey Telescope ATLAS. Shanks T., Metcalfe N., Chehade B., Findlay J.R., Irwin M.J., Gonzalez-Solares E., Lewis J.R., Yoldas A.K., Mann R.G., Read M.A., Sutorius E.T.W., Voutsinas S. <Mon. Not. R. Astron. Soc. 451, 4238 (2015) > =2015MNRAS.451.4238S =2017yCat.2350....0S
ADC_Keywords: Surveys ; Photometry, SDSS Mission_Name: ESO Keywords: catalogues - surveys - cosmology: observations - large-scale structure of Universe Abstract: The VLT Survey Telescope ATLAS survey is an optical ugriz survey aiming to cover ∼4700deg2 of the southern sky to similar depths as the Sloan Digital Sky Survey (SDSS). From reduced images and object catalogues provided by the Cambridge Astronomical Surveys Unit, we first find that the median seeing ranges from 0.8-arcsec FWHM (full width at half-maximum) in i to 1.0-arcsec in u, significantly better than the 1.2-1.5arcsec seeing for SDSS. The 5σ mag limit for stellar sources is rAB=22.7 and in all bands these limits are at least as faint as SDSS. SDSS and ATLAS are more equivalent for galaxy photometry except in the z band where ATLAS has significantly higher throughput. We have improved the original ESO magnitude zero-points by comparing m<16 star magnitudes with the AAVSO Photometric All-Sky Survey in gri, also extrapolating into u and z, resulting in zero-points accurate to ~±0.02mag. We finally compare star and galaxy number counts in a 250deg2 area with SDSS and other count data and find good agreement. ATLAS data products can be retrieved from the ESO Science Archive, while support for survey science analyses is provided by the OmegaCAM Science Archive, operated by the Wide-Field Astronomy Unit in Edinburgh. Description: The ATLAS sky coverage consists of two contiguous blocks in the North and South galactic caps. The ATLAS South Galactic Cap (SGC) area lies between 21h30m<RA<04h00m and -40°<Dec←10°, whilst the North Galactic Cap (NGC) area lies between 10h00m<RA<15h30m and -20°<Dec←2.5° plus 10h00m<RA<15h00m and -30°<Dec←20°. There is complete coverage of the VST KiDS survey (de Jong et al. 2013, Cat. II/344) in the SGC, but only partial coverage in the NGC. The NGC area below Dec←20° is approved as an ESO public survey in iz and is approved as a Chilean ESO proposal (e.g. 095.A-0561) in ugr. The total area of the survey is 4711 deg2 with 2087 deg2 in the NGC and 2624 deg2 in the SGC. There is also an ongoing 'Chilean u extension project' to double the exposure time in u from 2 to 4 min over the full ATLAS area (PI: L. Infante). Status maps of the ATLAS survey can be found at http://astro.dur.ac.uk/Cosmology/vstatlas/. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file vstatlas.sam 1302 1000 VST ATLAS DR3 catalog, sample output (106,775,847 sources)
Byte-by-byte Description of file: vstatlas.sam
Bytes Format Units Label Explanations
1- 12 I12 --- SrcID UID of this merged detection as assigned by merge algorithm (SOURCEID) 14- 23 F10.6 deg RAdeg Celestial Right Ascension (RA2000) (J2000) 25- 34 F10.6 deg DEdeg Celestial Declination (DEC2000) (J2000) 36- 65 A30 --- Name IAU Name (not unique) (IAUNAME) 67- 71 I5 --- cuEventId UID of curation event giving rise to this record (CUEVENTID) 73- 84 I12 --- FrameID UID of the set of frames that this merged source comes from (FRAMESETID) 86- 95 F10.6 deg GLON Galactic longitude (L) 97-106 F10.6 deg GLAT Galactic latitude (B) 108-119 I12 --- priOrSec Seam code for a unique (=0) or duplicated (!=0) source (PRIORSEC) 121-128 F8.4 mag U-Gpnt ? Point source colour U-G (using aperMag3) (UMGPNT) 130-139 F10.4 mag e_U-Gpnt ? Error on point source colour U-G (UMGPNTERR) 141-148 F8.4 mag G-Rpnt ? Point source colour G-R (using aperMag3) (GMRPNT) 150-159 F10.4 mag e_G-Rpnt ? Error on point source colour G-R (GMRPNTERR) 161-168 F8.4 mag R-Ipnt ? Point source colour R-I (using aperMag3) (RMIPNT) 170-179 F10.4 mag e_R-Ipnt ? Error on point source colour R-I (RMIPNTERR) 181-188 F8.4 mag I-Zpnt ? Point source colour I-Z (using aperMag3) (IMZPNT) 190-198 F9.4 mag e_I-Zpnt ? Error on point source colour I-Z (IMZPNTERR) 200-207 F8.4 mag U-Gext ? Extended source colour U-G (using aperMagNoAperCorr3) (UMGEXT) 209-218 F10.4 mag e_U-Gext ? Error on extended source colour U-G (UMGEXTERR) 220-227 F8.4 mag G-Rext ? Extended source colour G-R (using aperMagNoAperCorr3) (GMREXT) 229-238 F10.4 mag e_G-Rext ? Error on extended source colour G-R (GMREXTERR) 240-247 F8.4 mag R-Iext ? Extended source colour R-I (using aperMagNoAperCorr3) (RMIEXT) 249-258 F10.4 mag e_R-Iext ? Error on extended source colour R-I (RMIEXTERR) 260-267 F8.4 mag I-Zext ? Extended source colour I-Z (using aperMagNoAperCorr3) (IMZEXT) 269-277 F9.4 mag e_I-Zext ? Error on extended source colour I-Z (IMZEXTERR) 279-287 F9.4 --- Mstat Merged N(0,1) stellarness-of-profile statistic (MERGEDCLASSSTAT) 289-290 I2 --- Mclass [-3/1]? Class flag (MERGEDCLASS) (2) 292-299 F8.6 --- pStar Probability that the source is a star (PSTAR) 301-308 F8.6 --- pGal Probability that the source is a galaxy (PGALAXY) 310-317 F8.6 --- pNoise Probability that the source is noise (PNOISE) 319-324 F6.4 --- E(B-V) The galactic dust extinction value measured from the Schlegel maps. (EBV) 326-331 F6.4 mag AU The galactic extinction correction in U band 333-338 F6.4 mag AG The galactic extinction correction in G band 340-345 F6.4 mag AR The galactic extinction correction in R band 347-352 F6.4 mag AI The galagtic gxdinction correction in I band 354-359 F6.4 mag AZ The galactic extinction correction in Z band 361-367 F7.4 mag Upmag ? Extended source U magnitude (Petrosian) (UPETROMAG) 369-379 F11.4 mag e_Upmag ? Error in extended source U magnitude (Petrosian) (UPETROMAGERR) 381-387 F7.4 mag Uap3 ? Default point source U aperture corrected mag (2.0 arcsec diam) (UAPERMAG3) 389-398 F10.4 mag e_Uap3 ? Error in default point source U aperture corrected mag (2.0 arcsec (UAPERMAG3ERR) 400-406 F7.4 mag Uap4 ? Point source U aperture corrected mag (2.8 arcsec aperture diam) (UAPERMAG4) 408-418 F11.4 mag e_Uap4 ? Error in point source u aperture corrected mag (2.8 arcsec aperture (UAPERMAG4ERR) 420-426 F7.4 mag Uap6 ? Point source U aperture corrected mag (5.7 arcsec aperture diam) (UAPERMAG6) 428-437 F10.4 mag e_Uap6 ? Error in point source u aperture corrected mag (5.7 arcsec aperture (UAPERMAG6ERR) 439-445 F7.4 mag Uapc3 ? Default extended source U aperture corrected mag (2.0 arcsec diam) (UAPERMAGNOAPERCORR3) 447-453 F7.4 mag Uapc4 ? Extended source U aperture mag (2.8 arcsec aperture diameter) (UAPERMAGNOAPERCORR4) 455-461 F7.4 mag Uapc6 ? Extended source U aperture mag (5.7 arcsec aperture diameter) (UAPERMAGNOAPERCORR6) 463-469 F7.4 arcsec Uamaj ? Seeing corrected half-light, semi-major axis in U band (UHLCORSMJRADAS) 471-478 F8.4 pix Urms ? RMS of axes of ellipse fit in U (UGAUSIG) 480-485 F6.4 --- Uell ? 1-b/a, where a/b=semi-major/minor axes in U (UELL) 487-491 F5.1 deg UPA ? Ellipse fit celestial orientation in U 493-494 I2 --- Uerrbits Processing warning/error bitwise flags in U (UERRBITS) (1) 496-502 F7.3 --- Uavg ? Average confidence in 2 arcsec diam default aperture 3 U (UAVERAGECONF) 504-505 I2 --- Uclass [-9/1] Discrete image classification flag in U (UCLASS) (2) 507-514 F8.3 --- UclassSt ? N(0,1) stellarness-of-profile statistic in U (UCLASSSTAT) 516-522 I7 --- Uperrbits ? Additional WFAU post-Processing error bits in U (UPPERRBITS) (1) 524-528 I5 --- Useq ? Running number of the U detection (USEQNUM) 530-537 F8.6 arcsec Ueta ? Offset of U detection from master position (+north/-south) (UETA) 539-545 F7.4 mag Gpmag ? Extended source G mag (Petrosian) (GPETROMAG) 547-557 F11.4 mag e_Gpmag ? Error in extended source G mag (Petrosian) (GPETROMAGERR) 559-565 F7.4 mag Gap3 ? Default point source G aperture corrected mag (2.0 arcsec diam) (GAPERMAG3) 567-577 F11.4 mag e_Gap3 ? Error in default point source g aperture corrected mag (2.0 arcsec (GAPERMAG3ERR) 579-585 F7.4 mag Gap4 ? Point source G aperture corrected mag (2.8 arcsec aperture diam) (GAPERMAG4) 587-597 F11.4 mag e_Gap4 ? Error in point source g aperture corrected mag (2.8 arcsec aperture (GAPERMAG4ERR) 599-605 F7.4 mag Gap6 ? Point source G aperture corrected mag (5.7 arcsec aperture diam) (GAPERMAG6) 607-617 F11.4 mag e_Gap6 ? Error in point source g aperture corrected mag (5.7 arcsec aperture (GAPERMAG6ERR) 619-625 F7.4 mag Gapc3 ? Default extended source G aperture corrected mag (2.0 arcsec diam) (GAPERMAGNOAPERCORR3) 627-633 F7.4 mag Gapc4 ? Extended source G aperture mag (2.8 arcsec aperture diameter) (GAPERMAGNOAPERCORR4) 635-641 F7.4 mag Gapc6 ? Extended source G aperture mag (5.7 arcsec aperture diameter) (GAPERMAGNOAPERCORR6) 643-649 F7.4 arcsec Gamaj ? Seeing corrected half-light, semi-major axis in G band (GHLCORSMJRADAS) 651-659 F9.4 pix Grms ? RMS of axes of ellipse fit in G (GGAUSIG) 661-666 F6.4 --- Gell ? 1-b/a, where a/b=semi-major/minor axes in G (GELL) 668-672 F5.1 deg GPA ? Ellipse fit celestial orientation in G 674-675 I2 --- Gerrbits Processing warning/error bitwise flags in G (GERRBITS) (1) 677-683 F7.3 --- Gavg ? Average confidence in 2 arcsec diam default aperture 3 G (GAVERAGECONF) 685-686 I2 --- Gclass [-9/1] Discrete image classification flag in G (GCLASS) (2) 688-695 F8.3 --- GclassSt ? N(0,1) stellarness-of-profile statistic in G (GCLASSSTAT) 697-703 I7 --- Gperrbits ? Additional WFAU post-Processing error bits in G (GPPERRBITS) (1) 705-709 I5 --- Gseq ? the running number of the G detection (GSEQNUM) 711-719 F9.6 arcsec Gxi ? Offset of G detection from master position (+east/-west) (GXI) 721-729 F9.6 arcsec Geta ? Offset of G detection from master position (+north/-south) (GETA) 731-737 F7.4 mag Rpmag ? Extended source R mag (Petrosian) (RPETROMAG) 739-748 F10.4 mag e_Rpmag ? Error in extended source R mag (Petrosian) (RPETROMAGERR) 750-756 F7.4 mag Rap3 ? Default point source R aperture corrected mag (2.0 arcsec diam) (RAPERMAG3) 758-768 F11.4 mag e_Rap3 ? Error in default point source r aperture corrected mag (2.0 arcsec (RAPERMAG3ERR) 770-776 F7.4 mag Rap4 ? Point source R aperture corrected mag (2.8 arcsec aperture diam) (RAPERMAG4) 778-787 F10.4 mag e_Rap4 ? Error in point source r aperture corrected mag (2.8 arcsec aperture (RAPERMAG4ERR) 789-795 F7.4 mag Rap6 ? Point source R aperture corrected mag (5.7 arcsec aperture diam) (RAPERMAG6) 797-806 F10.4 mag e_Rap6 ? Error in point source r aperture corrected mag (5.7 arcsec aperture (RAPERMAG6ERR) 808-814 F7.4 mag Rapc3 ? Default extended source R aperture corrected mag (2.0 arcsec diam) (RAPERMAGNOAPERCORR3) 816-822 F7.4 mag Rapc4 ? Extended source R aperture mag (2.8 arcsec aperture diameter) (RAPERMAGNOAPERCORR4) 824-830 F7.4 mag Rapc6 ? Extended source R aperture mag (5.7 arcsec aperture diameter) (RAPERMAGNOAPERCORR6) 832-838 F7.4 arcsec Ramaj ? Seeing corrected half-light, semi-major axis in R band (RHLCORSMJRADAS) 840-848 F9.4 pix Rrms ? RMS of axes of ellipse fit in R (RGAUSIG) 850-855 F6.4 --- Rell ? 1-b/a, where a/b=semi-major/minor axes in R (RELL) 857-861 F5.1 deg RPA ? Ellipse fit celestial orientation in R 863-864 I2 --- Rerrbits Processing warning/error bitwise flags in R (RERRBITS) (1) 866-872 F7.3 --- Ravg ? Average confidence in 2 arcsec diam default aperture 3 R (RAVERAGECONF) 874-875 I2 --- Rclass [-9/1] Discrete image classification flag in R (RCLASS) (2) 877-884 F8.3 --- RclassSt ? N(0,1) stellarness-of-profile statistic in R (RCLASSSTAT) 886-892 I7 --- Rperrbits ? Additional WFAU post-Processing error bits in R (RPPERRBITS) (1) 894-898 I5 --- Rseq ? the running number of the R detection (RSEQNUM) 900-908 F9.6 arcsec Rxi ? Offset of R detection from master position (+east/-west) (RXI) 910-918 F9.6 arcsec Reta ? Offset of R detection from master position (+north/-south) (RETA) 920-926 F7.4 mag Ipmag ? Extended source I mag (Petrosian) (IPETROMAG) 928-938 F11.4 mag e_Ipmag ? Error in extended source I mag (Petrosian) (IPETROMAGERR) 940-946 F7.4 mag Iap3 ? Default point source I aperture corrected mag (2.0 arcsec diam) (IAPERMAG3) 948-959 F12.4 mag e_Iap3 ? Error in default point source i aperture corrected mag (2.0 arcsec (IAPERMAG3ERR) 961-967 F7.4 mag Iap4 ? Point source I aperture corrected mag (2.8 arcsec aperture diam) (IAPERMAG4) 969-978 F10.4 mag e_Iap4 ? Error in point source I aperture corrected mag (2.8 arcsec aperture (IAPERMAG4ERR) 980-986 F7.4 mag Iap6 ? Point source I aperture corrected mag (5.7 arcsec aperture diam) (IAPERMAG6) 988-998 F11.4 mag e_Iap6 ? Error in point source I aperture corrected mag (5.7 arcsec aperture (IAPERMAG6ERR) 1000-1006 F7.4 mag Iapc3 ? Default extended source I aperture corrected mag (2.0 arcsec diam) (IAPERMAGNOAPERCORR3) 1008-1014 F7.4 mag Iapc4 ? Extended source I aperture mag (2.8 arcsec aperture diameter) (IAPERMAGNOAPERCORR4) 1016-1022 F7.4 mag Iapc6 ? Extended source I aperture mag (5.7 arcsec aperture diameter) (IAPERMAGNOAPERCORR6) 1024-1030 F7.4 arcsec Iamaj ? Seeing corrected half-light, semi-major axis in I band (IHLCORSMJRADAS) 1032-1040 F9.4 pix Irms ? RMS of axes of ellipse fit in I (IGAUSIG) 1042-1047 F6.4 --- Iell ? 1-b/a, where a/b=semi-major/minor axes in I (IELL) 1049-1053 F5.1 deg IPA ? Ellipse fit celestial orientation in I 1055-1056 I2 --- Ierrbits Processing warning/error bitwise flags in I (IERRBITS) (1) 1058-1064 F7.3 --- Iavg ? Average confidence in 2 arcsec diam default aperture 3 I (IAVERAGECONF) 1066-1067 I2 --- Iclass [-9/1] Discrete image classification flag in I (ICLASS) (2) 1069-1076 F8.3 --- IclassSt ? N(0,1) stellarness-of-profile statistic in I (ICLASSSTAT) 1078-1084 I7 --- Iperrbits ? Additional WFAU post-Processing error bits in I (IPPERRBITS) (1) 1086-1090 I5 --- Iseq ? the running number of the I detection (ISEQNUM) 1092-1100 F9.6 arcsec Ixi ? Offset of I detection from master position (+east/-west) (IXI) 1102-1110 F9.6 arcsec Ieta ? Offset of I detection from master position (+north/-south) (IETA) 1112-1118 F7.4 mag Zpmag ? Extended source Z mag (Petrosian) (ZPETROMAG) 1120-1130 F11.4 mag e_Zpmag ? Error in extended source Z mag (Petrosian) (ZPETROMAGERR) 1132-1138 F7.4 mag Zap3 ? Default point source Z aperture corrected mag (2.0 arcsec diam) (ZAPERMAG3) 1140-1150 F11.4 mag e_Zap3 ? Error in default point source z aperture corrected mag (2.0 arcsec (ZAPERMAG3ERR) 1152-1158 F7.4 mag Zap4 ? Point source Z aperture corrected mag (2.8 arcsec aperture diam) (ZAPERMAG4) 1160-1170 F11.4 mag e_Zap4 ? Error in point source z aperture corrected mag (2.8 arcsec aperture (ZAPERMAG4ERR) 1172-1178 F7.4 mag Zap6 ? Point source Z aperture corrected mag (5.7 arcsec aperture diam) (ZAPERMAG6) 1180-1190 F11.4 mag e_Zap6 ? Error in point source z aperture corrected mag (5.7 arcsec aperture (ZAPERMAG6ERR) 1192-1198 F7.4 mag Zapc3 ? Default extended source Z aperture corrected mag (2.0 arcsec diam) (ZAPERMAGNOAPERCORR3) 1200-1206 F7.4 mag Zapc4 ? Extended source Z aperture mag (2.8 arcsec aperture diameter) (ZAPERMAGNOAPERCORR4) 1208-1214 F7.4 mag Zapc6 ? Extended source Z aperture mag (5.7 arcsec aperture diameter) (ZAPERMAGNOAPERCORR6) 1216-1222 F7.4 arcsec Zamaj ? Seeing corrected half-light, semi-major axis in Z band (ZHLCORSMJRADAS) 1224-1231 F8.4 pix Zrms ? RMS of axes of ellipse fit in Z (ZGAUSIG) 1233-1238 F6.4 --- Zell ? 1-b/a, where a/b=semi-major/minor axes in Z (ZELL) 1240-1244 F5.1 deg ZPA ? Ellipse fit celestial orientation in Z 1246-1247 I2 --- Zerrbits Processing warning/error bitwise flags in Z (ZERRBITS) (1) 1249-1255 F7.3 --- Zavg ? Average confidence in 2 arcsec diam default aperture 3 Z (ZAVERAGECONF) 1257-1258 I2 --- Zclass [-9/1] Discrete image classification flag in Z (ZCLASS) (2) 1260-1267 F8.3 --- ZclassSt ? N(0,1) stellarness-of-profile statistic in Z (ZCLASSSTAT) 1269-1275 I7 --- Zperrbits ? Additional WFAU post-Processing error bits in Z (ZPPERRBITS) (1) 1277-1280 I4 --- Zseq ? the running number of the Z detection (ZSEQNUM) 1282-1290 F9.6 arcsec Zxi ? Offset of Z detection from master position (+east/-west) (ZXI) 1292-1300 F9.6 arcsec Zeta ? Offset of Z detection from master position (+north/-south) (ZETA) 1302 I1 --- Prim [0/1] Primary source 1; secondary source 0 (PRIMARY_SOURCE)
Note (1): We recommend that users should restrict their analysis to objects with Uerrbits, Gerrbits, etc<255 at all times and Uerrbits=0 if they require the most reliable subset of the sources. Values of Uerrbits=16 indicate that the source was deblended, Uerrbits=64 that at least one bad pixel was within the default aperture and Uerrbits=128 that the source was low confidence within the default aperture. Note (2): Class flag as follows: 1 = galaxy 0 = noise -1 = star -2 = probable star -3 = probable galaxy
History: Copied at http://astro.dur.ac.uk/Cosmology/vstatlas
(End) Patricia Vannier [CDS] 13-Nov-2017
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