II/270 TCS-CAIN: NIR Survey of the Galactic plane (Cabrera-Lavers+, 2006)
TCS-CAIN: A deep multicolor NIR survey of the Galactic plane.
Cabrera-Lavers A., Garzon F., Hammersley P.L., Vicente B.,
Gonzalez-Fernandez C.
<Astron. Astrophys. 453, 371 (2006)>
=2006A&A...453..371C 2006A&A...453..371C
ADC_Keywords: Infrared sources ; Galactic plane ; Surveys
Keywords: Galaxy: structure - infrared: stars
Abstract:
We describe a deep multi-colour NIR survey (TCS-CAIN) that has been
recently completed at the Instituto de Astrofisica de Canarias
(Spain). The survey is of selected areas distributed along the
Galactic plane and it goes deeper than 2MASS or DENIS. Its aim was to
explore the large-scale structure of the Milky Way and the Galactic
components, in particular the Galactic bar. This survey has about
10 million point-source detections in J, H, and Ks filters with a
photometric accuracy of about 0.1mag in the three bands and a
positional accuracy of about 0.2" (based on the 2MASS catalogue as
the astrometric reference).
Description:
Point sources detections in J, H and K obtained along the TCS-CAIN
survey in the 530 recorded Galactic fields. Individual magnitudes for
each point source in the three bands, their coordinates (both
equatorial and galactic ones), and cross-matching with 2MASS sources
is provided in each catalogue file. Each file corresponds to a single
field observed along the survey and it is named using the central
galactic coordinates as reference (see Section 6 in the paper for
details). At the beginning of each field astrometric transformation
coefficients, photometric zero-points, extinction coefficients, and
photometric uncertainties are enumerated (as they are obtained for
each single catalogue field as a whole).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
files.dat 147 530 Main characteristics of the catalogue files
and quality flags associated to them
catal/* . 530 *Catalogue files (530 individual files)
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Note on catal/* : At the beginning of each file is described all the
information concerning to the field as a whole (zero-points, astrometric
coefficients, date, etc...). All this information is preceded by a "#"
symbol for format convenience when reading the file.
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
B/denis : The DENIS database (DENIS Consortium, 2005)
Byte-by-byte Description of file: files.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- File Catalogue filename, in "catal" subdirectory
13- 15 I3 deg GLON Central Galactic longitude of the field
17- 21 F5.1 deg GLAT Central Galactic latitude of the field
24- 30 F7.3 deg RAdeg Right Ascension J2000
33- 39 F7.3 deg DEdeg Right Ascension J2000
41- 48 A8 "DD/MM/YY" Date Date of observation
50- 55 F6.4 deg+2 Area Area in the sky covered by the field
57- 58 I2 --- Nfr Number of frames observed in the field
61- 65 I5 --- N Total number of detections
68- 72 I5 --- Nj Point sources detections in J filter
75- 79 I5 --- Nh Point sources detections in H filter
82- 86 I5 --- Nk Point sources detections in K filter
89- 93 I5 --- Njh Simultaneous detections in J and H bands
96-100 I5 --- Njk Simultaneous detections in J and K bands
103-107 I5 --- Nhk Simultaneous detections in H and K bands
109-110 I2 --- Qf Image quality flag (1)
112-113 I2 --- A1f Astrometric flag A (2)
116 I1 --- A2f Astrometric flag B (3)
119 I1 --- A3f Astrometric flag C (4)
121-123 I3 --- Pf Photometric flag (5)
125-131 F7.4 mag DJmag Mean J photometric difference (2MASS-TCS)
133-139 F7.4 mag DHmag Mean H photometric difference (2MASS-TCS)
141-147 F7.4 mag DKmag Mean K photometric difference (2MASS-TCS)
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Note (1): This gives the number of frames which fall outside the quality
criteria defined from the overall shape of the images in each
available band ('0' means a high quality field).
Note (2): This gives the number of frames with mean astrometric differences
between 0.25" and 0.5" with respect to 2MASS either in RA or DE.
Note (3): This gives the number of frames with mean astrometric differences
larger than 0.5" with respect to 2MASS either in RA or DE.
Note (4): This gives the number of frames with a pointing offset larger
than 100" respect to the nominal pointing of the telescope.
Note (5): This shows any significant mean photometric offset in the field
with respect to 2MASS photometry. A symbol per filter in such a
way as a '0' means no difference larger than 0.25mag. A '1' means
an offset between 0.25 and 0.4mag in the corresponding filter
and finally, a '2' means an extremely large offset (>0.4mag).
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Byte-by-byte Description of file (#): catal/*
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [cain]
5- 18 A14 --- ID Source identification: LLL+BBb-frNNNN (1)
21- 30 F10.6 deg RAdeg Right ascension (J2000.0)
33- 42 F10.6 deg DEdeg Declination (J2000.0)
45- 54 F10.6 deg GLON [0/360] Galactic longitude
57- 66 F10.6 deg GLAT Galactic latitude
69- 74 F6.2 pix xpos X position in the image frame (1)
77- 82 F6.2 pix ypos Y position in the image frame (1)
85- 90 F6.3 mag Jmag ?=99.999 J magnitude (3)
93- 98 F6.3 mag Hmag ?=99.999 H magnitude (3)
101-106 F6.3 mag Kmag ?=99.999 K magnitude (3)
108-109 I2 --- Nima Number of contributing overlapping images
112-127 A16 --- 2MASS Cross-number with 2MASS catalogue (II/246)
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Note (1): Each frame is identified in the ID as the first two numbers of
the last part of the name (e.g. cainLLL-BBb-11xxxx corresponds
to the detections in the frame 11 of the field l=LLL b=-BB.b).
See Section 6 in the paper for details.
Note (3): Zero-points, extinction coefficients, and photometric errors
are showed at the beginning of each file.
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Acknowledgements: Antonio Cabrera-Lavers, antonio.cabrera(at)gtc.iac.es
(End) A.Cabrera-Lavers [IAC, Spain], Patricia Vannier [CDS] 27-Mar-2006