II/385 VLT Survey Telescope ATLAS DR4 (Shanks+, 2025)
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 2015MNRAS.451.4238S
=2025yCat.2385....0S 2025yCat.2385....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 ESO Public Survey ATLAS with VST is targeting 4500 square degrees
of the southern sky in u,g,r,i,z. The band-merged catalogue of this
fourth release ranges from the beginning of observations in August
2011 to end July 2017.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
vst_atlas4.sam 993 1000 VST-ATLAS DR4 catalog
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See also:
II/350 : VLT Survey Telescope ATLAS DR3 (Shanks+, 2015)
Byte-by-byte Description of file: vst_atlas4.sam
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Bytes Format Units Label Explanations
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1- 12 I12 --- SrcID UID of this merged detection as assigned
by merge algorithm (SOURCEID)
14- 29 F16.12 deg RAdeg Celestial Right Ascension (J2000) (RA2000)
31- 46 F16.12 deg DEdeg Celestial Declination (J2000) (DEC2000)
48- 77 A30 --- Name IAU Name (not unique) (IAUNAME)
79- 83 I5 --- cuEventId UID of curation event giving rise to this
record (CUEVENTID)
85- 96 I12 --- FrameID UID of the set of frames that this merged
source comes from (FRAMESETID)
98-109 I12 --- priOrSec Seam code for a unique (=0) or duplicated
(!=0) source (PRIORSEC)
111-118 F8.4 mag U-Gpnt ? Point source colour U-G (using aperMag3)
(UMGPNT)
120-129 F10.4 mag e_U-Gpnt ? Error on point source colour U-G
(UMGPNTERR)
131-138 F8.4 mag G-Rpnt ? Point source colour G-R (using aperMag3)
(GMRPNT)
140-149 F10.4 mag e_G-Rpnt ? Error on point source colour G-R
(GMRPNTERR)
151-158 F8.4 --- R-Ipnt ? Point source colour R-I (using aperMag3)
(RMIPNT)
160-169 F10.4 --- e_R-Ipnt ? Error on point source colour R-I
(RMIPNTERR)
171-178 F8.4 --- I-Zpnt ? Point source colour I-Z (using aperMag3)
(IMZPNT)
180-188 F9.4 --- e_I-Zpnt ? Error on point source colour I-Z
(IMZPNTERR)
190-197 F8.4 mag U-Gext ? Extended source colour U-G (using
aperMagNoAperCorr3) (UMGEXT)
199-208 F10.4 mag e_U-Gext ? Error on extended source colour U-G
(UMGEXTERR)
210-217 F8.4 mag G-Rext ? Extended source colour G-R (using
aperMagNoAperCorr3) (GMREXT)
219-228 F10.4 mag e_G-Rext ? Error on extended source colour G-R
(GMREXTERR)
230-237 F8.4 --- R-Iext ? Extended source colour R-I (using
aperMagNoAperCorr3) (RMIEXT)
239-248 F10.4 --- e_R-Iext ? Error on extended source colour R-I
(RMIEXTERR)
250-257 F8.4 mag I-Zext ? Extended source colour I-Z (using
aperMagNoAperCorr3) (IMZEXT)
259-267 F9.4 mag e_I-Zext ? Error on extended source colour I-Z
(IMZEXTERR)
269-277 F9.4 --- Mstat Merged N(0,1) stellarness-of-profile
statistic (MERGEDCLASSSTAT)
279-280 I2 --- Mclass [-3/-1]? Class flag (MERGEDCLASS) (1)
282-291 F10.8 --- pStar Probability that the source is a star (PSTAR)
293-302 F10.8 --- pGal Probability that the source is a galaxy
(PGALAXY)
304-313 F10.8 --- pNoise Probability that the source is noise (PNOISE)
315-320 F6.4 --- E(B-V) The galactic dust extinction value measured
from the Schlegel maps. (EBV)
322-328 F7.4 mag Upmag ? Extended source U magnitude (Petrosian)
(UPETROMAG)
330-341 E12.6 mag e_Upmag ? Error in extended source U magnitude
(Petrosian) (UPETROMAGERR)
343-349 F7.4 mag Ukmag ? Extended source U magnitude (Kron)
(UKRONMAG)
351-362 E12.6 mag e_Ukmag ? Error in extended source U magnitude (Kron)
(UKRONMAGERR)
364-370 F7.4 mag Uap3 ? Default point source U aperture corrected
magnitude (2.0 arcsec diameter) (UAPERMAG3)
372-383 E12.6 mag e_Uap3 ? Error in default point source u aperture
corrected magnitude (2.0 arcsec diameter)
(UAPERMAG3ERR)
385-391 F7.4 mag Uap6 ? Point source U aperture corrected magnitude
(5.7 arcsec aperture diameter) (UAPERMAG6)
393-404 E12.6 mag e_Uap6 ? Error in point source u aperture corrected
magnitude (5.7 arcsec aperture diameter)
(UAPERMAG6ERR)
406-412 F7.4 mag Uapc3 ? Default extended source U aperture
corrected magnitude (2.0 arcsec diameter)
(UAPERMAGNOAPERCORR3)
414-420 F7.4 mag Uapc6 ? Extended source U aperture magnitude
(5.7 arcsec aperture diameter)
(UAPERMAGNOAPERCORR6)
422-428 F7.4 arcsec Uamaj ? Seeing corrected half-light, semi-major
axis in U band (UHLCORSMJRADAS)
430-434 F5.3 --- Uell ? 1-b/a, where a/b=semi-major/minor axes
in U (UELL)
436-443 F8.3 --- UclassSt ? N(0,1) stellarness-of-profile statistic
in U (UCLASSSTAT)
445-447 F3.1 arcsec Uxi ? Offset of U detection from master position
(+east/-west) (UXI)
449-451 F3.1 arcsec Ueta ? Offset of U detection from master position
(+north/-south) (UETA)
453-459 F7.4 mag Gpmag ? Extended source G magnitude (Petrosian)
(GPETROMAG)
461-472 E12.6 mag e_Gpmag ? Error in extended source G magnitude
(Petrosian) (GPETROMAGERR)
474-480 F7.4 mag Gkmag ? Extended source G magnitude (Kron)
(GKRONMAG)
482-493 E12.6 mag e_Gkmag ? Error in extended source G magnitude (Kron)
(GKRONMAGERR)
495-501 F7.4 mag Gap3 ? Default point source G aperture corrected
magnitude (2.0 arcsec diameter) (GAPERMAG3)
503-515 F13.6 mag e_Gap3 ? Error in default point source g aperture
corrected magnitude (2.0 arcsec diameter)
(GAPERMAG3ERR)
517-523 F7.4 mag Gap6 ? Point source G aperture corrected magnitude
(5.7 arcsec aperture diameter) (GAPERMAG6)
525-536 E12.6 mag e_Gap6 ? Error in point source g aperture corrected
magnitude (5.7 arcsec aperture diameter)
(GAPERMAG6ERR)
538-544 F7.4 mag Gapc3 ? Default extended source G aperture
corrected magnitude (2.0 arcsec diameter)
(GAPERMAGNOAPERCORR3)
546-552 F7.4 --- Gapc4 ? Extended source G aperture magnitude
(2.8 arcsec aperture diameter)
(GAPERMAGNOAPERCORR4)
554-560 F7.4 --- Gamaj ? Seeing corrected half-light, semi-major
axis in G band (GHLCORSMJRADAS)
562-566 F5.3 --- Gell ? 1-b/a, where a/b=semi-major/minor axes
in G (GELL)
568-575 F8.3 --- GclassSt ? N(0,1) stellarness-of-profile statistic
in G (GCLASSSTAT)
577-582 F6.3 arcsec Gxi ? Offset of G detection from master position
(+east/-west) (GXI)
584-589 F6.3 arcsec Geta ? Offset of G detection from master position
(+north/-south) (GETA)
591-597 F7.4 mag Rpmag ? Extended source R magnitude (Petrosian)
(RPETROMAG)
599-610 E12.6 mag e_Rpmag ? Error in extended source R magnitude
(Petrosian) (RPETROMAGERR)
612-618 F7.4 mag Rkmag ? Extended source R magnitude (Kron)
(RKRONMAG)
620-631 E12.6 mag e_Rkmag ? Error in extended source R magnitude (Kron)
(RKRONMAGERR)
633-639 F7.4 mag Rap3 ? Default point source R aperture corrected
magnitude (2.0 arcsec diameter) (RAPERMAG3)
641-652 E12.6 mag e_Rap3 ? Error in default point source r aperture
corrected magnitude (2.0 arcsec diameter)
(RAPERMAG3ERR)
654-660 F7.4 mag Rap6 ? Point source R aperture corrected magnitude
(5.7 arcsec aperture diameter) (RAPERMAG6)
662-673 E12.6 mag e_Rap6 ? Error in point source r aperture corrected
magnitude (5.7 arcsec aperture diameter)
(RAPERMAG6ERR)
675-681 F7.4 --- Rapc3 ? Default extended source R aperture
corrected magnitude (2.0 arcsec diameter)
(RAPERMAGNOAPERCORR3)
683-689 F7.4 mag Rapc6 ? Extended source R aperture magnitude
(5.7 arcsec aperture diameter)
(RAPERMAGNOAPERCORR6)
691-697 F7.4 arcsec Ramaj ? Seeing corrected half-light, semi-major
axis in R band (RHLCORSMJRADAS)
699-703 F5.3 --- Rell ? 1-b/a, where a/b=semi-major/minor axes
in R (RELL)
705-712 F8.3 --- RclassSt ? N(0,1) stellarness-of-profile statistic
in R (RCLASSSTAT)
714-719 F6.3 arcsec Rxi ? Offset of R detection from master position
(+east/-west) (RXI)
721-726 F6.3 arcsec Reta ? Offset of R detection from master position
(+north/-south) (RETA)
728-734 F7.4 mag Ipmag ? Extended source I magnitude (Petrosian)
(IPETROMAG)
736-747 E12.6 mag e_Ipmag ? Error in extended source I magnitude
(Petrosian) (IPETROMAGERR)
749-755 F7.4 mag Ikmag ? Extended source I magnitude (Kron)
(IKRONMAG)
757-768 E12.6 mag e_Ikmag ? Error in extended source I magnitude (Kron)
(IKRONMAGERR)
770-776 F7.4 mag Iap3 ? Default point source I aperture corrected
magnitude (2.0 arcsec diameter) (IAPERMAG3)
778-789 E12.6 mag e_Iap3 ? Error in default point source i aperture
corrected magnitude (2.0 arcsec diameter)
(IAPERMAG3ERR)
791-797 F7.4 mag Iap6 ? Point source I aperture corrected magnitude
(5.7 arcsec aperture diameter) (IAPERMAG6)
799-810 E12.6 mag e_Iap6 ? Error in point source i aperture corrected
magnitude (5.7 arcsec aperture diameter)
(IAPERMAG6ERR)
812-818 F7.4 mag Iapc3 ? Default extended source I aperture
corrected magnitude (2.0 arcsec diameter)
(IAPERMAGNOAPERCORR3)
820-826 F7.4 mag Iapc6 ? Extended source I aperture magnitude
(5.7 arcsec aperture diameter)
(IAPERMAGNOAPERCORR6)
828-834 F7.4 arcsec Iamaj ? Seeing corrected half-light, semi-major
axis in I band (IHLCORSMJRADAS)
836-840 F5.3 --- Iell ? 1-b/a, where a/b=semi-major/minor axes
in I (IELL)
842-849 F8.3 --- IclassSt ? N(0,1) stellarness-of-profile statistic
in I (ICLASSSTAT)
851-856 F6.3 arcsec Ixi ? Offset of I detection from master position
(+east/-west) (IXI)
858-863 F6.3 arcsec Ieta ? Offset of I detection from master position
(+north/-south) (IETA)
865-871 F7.4 mag Zpmag ? Extended source Z magnitude (Petrosian)
(ZPETROMAG)
873-884 E12.6 mag e_Zpmag ? Error in extended source Z magnitude
(Petrosian) (ZPETROMAGERR)
886-892 F7.4 mag Zkmag ? Extended source Z magnitude (Kron)
(ZKRONMAG)
894-905 E12.6 mag e_Zkmag ? Error in extended source Z magnitude (Kron)
(ZKRONMAGERR)
907-913 F7.4 mag Zap3 ? Default point source Z aperture corrected
magnitude (2.0 arcsec diameter) (ZAPERMAG3)
915-926 E12.6 mag e_Zap3 ? Error in default point source z aperture
corrected magnitude (2.0 arcsec diameter)
(ZAPERMAG3ERR)
928-934 F7.4 mag Zap6 ? Point source Z aperture corrected magnitude
(5.7 arcsec aperture diameter) (ZAPERMAG6)
936-947 E12.6 mag e_Zap6 ? Error in point source z aperture corrected
magnitude (5.7 arcsec aperture diameter)
(ZAPERMAG6ERR)
949-955 F7.4 mag Zapc3 ? Default extended source Z aperture
corrected magnitude (2.0 arcsec diameter)
(ZAPERMAGNOAPERCORR3)
957-963 F7.4 --- Zapc6 ? Extended source Z aperture magnitude
(5.7 arcsec aperture diameter)
(ZAPERMAGNOAPERCORR6)
965-971 F7.4 arcsec Zamaj ? Seeing corrected half-light, semi-major
axis in Z band (ZHLCORSMJRADAS)
973-977 F5.3 --- Zell ? 1-b/a, where a/b=semi-major/minor axes
in Z (ZELL)
979-984 F6.3 arcsec Zxi ? Offset of Z detection from master position
(+east/-west) (ZXI)
986-991 F6.3 arcsec Zeta ? Offset of Z detection from master position
(+north/-south) (ZETA)
993 I1 --- Prim [0/1] Primary source 1; secondary source 0
(PRIMARY_SOURCE)
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Note (1): Class flag as follows:
1 = galaxy
0 = noise
-1 = star
-2 = probable star
-3 = probable galaxy
-9 = saturated
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History:
From https://www.eso.org/qi/catalog/show/266
Acknowledgements:
Please include the following acknowledgment in any published material
that makes use of this data product: Based on data obtained from the
ESO Science Archive Facility with DOI:
https://doi.org/10.18727/archive/66
(End) Patricia Vannier [CDS] 02-Apr-2025