J/A+A/632/A85 PSF photometric catalog of VVV survey data (Zhang+, 2019)
Deep point spread function photometric catalog of the VVV survey data.
Zhang M., Kainulainen J.
<Astron. Astrophys. 632, A85 (2019)>
=2019A&A...632A..85Z 2019A&A...632A..85Z (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galactic plane ; Photometry, infrared
Keywords: techniques: photometric - infrared: stars - surveys - catalogs
Abstract:
The Vista Variables in the Via Lactea (VVV) survey has performed a
multi-epoch near-infrared imaging of the inner Galactic plane.
High-fidelity photometric catalogs are needed to utilize the data. We
aim at producing a deep, point-spread-function (PSF) photometric
catalog for the VVV survey J, H, and Ks band data. Specifically, we
aim at taking advantage of all the epochs of the survey to reach high
limiting magnitudes. We develop an automatic PSF-fitting pipeline
based on the DaoPHOT algorithm and perform photometry on the stacked
VVV images in J, H, and Ks bands. We present a PSF photometric catalog
in the Vega system that contains about 926 million sources in the J,
H, and Ks filters. About 10% of the sources are flagged as possible
spurious detections. The 5 sigma limiting magnitudes of the sources
with high reliability are about 20.8, 19.5, and 18.7mag in the J, H,
and Ks band, respectively, depending on the local crowding condition.
Our photometric catalog reaches on average about one magnitude deeper
than the previously released PSF DoPHOT photometric catalog. It also
includes less spurious detections. There are significant differences
in the brightnesses of faint sources between our catalog and the
previously released one. The likely origin of these differences is in
the different photometric algorithms that are utilized; it is not
straightforward to assess which catalog is more accurate in which
situations. Our new catalog is beneficial especially for science goals
that require high limiting magnitudes; our catalog reaches such in
fields that have a relatively uniform source number density. Overall,
the limiting magnitudes and completeness are different in the fields
with different crowding conditions.
Description:
The VVV survey maps the Galactic bulge (-10°<l<10°,
-10°<b<5°) and part of the adjacent Galactic plane
(-65°<l←10°, -2°<b<2°). The whole survey area is
splited into 348 about 1.5x1.1deg2 tiles. The released PSF
photometric catalogs are comprised of 348 FITS binary tables and each
FITS binary table corresponds to a tile.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 66 348 List of released tables (FITS and ascii formats)
tab/* . 348 Complete catalog as ascii tables
fitstab/* . 348 Individual FITS tables
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See also:
http://horus.roe.ac.uk/vsa : VSA - VISTA Science Archive Home Page
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg Right ascension (J2000)
13- 23 F11.7 deg DEdeg Declination (J2000)
25- 32 F8.4 deg GLON Galactic longitude
34- 40 F7.4 deg GLAT Galactic latitude
42- 48 I7 --- NRows Number of sources in the FITS table
50- 57 A8 --- FitsName Name of the FITS file in subdirectory fitstab
59- 66 A8 --- DataName Name of the ascii file in subdirectory tab
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Byte-by-byte Description of file: tab/*
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Bytes Format Units Label Explanations
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1- 7 F7.3 deg RAdeg [0/360] Right ascension (J2000) (RA)
9- 16 F8.4 deg DEdeg Declination (J2000) (DEC)
18- 23 F6.3 mag J2mag J band magnitude in 2MASS system (JMAG_2MASS)
25- 32 F8.4 mag JVmag J band magnitude in VISTA system (JMAG_VISTA)
34- 38 F5.3 mag e_Jmag J band photometric error (JERR)
40- 51 E12.6 --- Jsky ?=-99 J band sky value (in ADU units) (JSKY)
53- 55 I3 --- Jniter ?=-99 Number of PSF-fitting iterations for
object in J band (JNITER)
57- 66 F10.6 --- JSharp ?=-99 Roundness of object in J band
(JSHARPNESS)
68- 74 F7.3 --- Jchi ?=-99 Goodness of PSF fit for object in J band
(JCHI)
76- 85 F10.6 --- Jpier [0/1]?=-99 integer error code for J band
(0 means no error) (JPIER)
87- 92 F6.3 mag H2mag H band magnitude in 2MASS system (HMAG_2MASS)
94-101 F8.4 mag HVmag ?=-99 H band magnitude in VISTA system
(HMAG_VISTA)
103-107 F5.3 mag e_Hmag H band photometric error (HERR)
109-120 E12.6 --- Hsky ?=-99 H band sky value (in ADU units) (HSKY)
122-124 I3 --- Hniter ?=-99 Number of PSF-fitting iterations for
object in H band (HNITER)
126-135 F10.6 --- HSharp ?=-99 Roundness of object in H band
(HSHARPNESS)
137-143 F7.3 --- Hchi ?=-99 Goodness of PSF fit for object in H band
(HCHI)
145-154 F10.6 --- Hpier [0/1]?=-99 Integer error code for H band
(0 means no error) (HPIER)
156-161 F6.3 mag K2mag K band magnitude in 2MASS system (KMAG_2MASS)
163-170 F8.4 mag KVmag ?=-99 K band magnitude in VISTA system
(KMAG_VISTA)
172-176 F5.3 mag e_Kmag K band photometric error (KERR)
178-189 E12.6 --- Ksky ?=-99 K band sky value (in ADU units) (KSKY)
191-193 I3 --- Kniter ?=-99 Number of PSF-fitting iterations for
object in K band (KNITER)
195-204 F10.6 --- KSharp ?=-99 Roundness of object in K band
(KSHARPNESS)
206-212 F7.3 --- Kchi ?=-99 Goodness of PSF fit for object in K band
(KCHI)
214-223 F10.6 --- Kpier [0/1]?=-99 Integer error code for K band
(0 means no error) (KPIER)
225-233 F9.5 deg GLON [0/360] Galactic longitude (GLON)
235-243 F9.5 deg GLAT Galactic latitude (GLAT)
245 I1 --- JFlag [0/1] 1 marks possible spurious detection
based on JERR-JMAG relation (FLAG_J)
247 I1 --- HFlag [0/1] 1 marks possible spurious detection
based on HERR-HMAG relation (FLAG_H)
249 I1 --- KFlag [0/1] 1 marks possible spurious detection
based on KERR-KMAG relation (FLAG_K)
251 I1 --- KJFlag [0/1] 1 marks possible spurious detection
based on KERR-JMAG relation (FLAG_KJ)
253 I1 --- KHFlag [0/1] 1 marks possible spurious detection
based on KERR-HMAG relation (FLAG_KH)
255 I1 --- HJFlag [0/1] 1 marks possible spurious detection
based on HERR-JMAG relation (FLAG_HJ)
257 I1 --- HKFlag [0/1] 1 marks possible spurious detection
based on HERR-KMAG relation (FLAG_HK)
259 I1 --- JHFlag [0/1] 1 marks possible spurious detection
based on JERR-HMAG relation (FLAG_JH)
261 I1 --- JKFlag [0/1] 1 marks possible spurious detection
based on JERR-KMAG relation (FLAG_JK)
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Acknowledgements:
Miaomiao Zhang, miaomiao(at)pmo.ac.cn
(End) Patricia Vannier [CDS] 26-Nov-2019