J/A+A/585/A49 VCNS II. The IR-excess-selected population (Zeidler+, 2016)
The VISTA Carina Nebula Survey. II.
Spatial distribution of the infrared excess-selected young stellar population.
Zeidler P., Preibisch T., Ratzka T., Roccatagliata V., Petr-Gotzens M.G.
<Astron. Astrophys. 585, A49 (2016)>
=2016A&A...585A..49Z 2016A&A...585A..49Z (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, pre-main sequence; YSOs ; Photometry, infrared
Keywords: stars: formation - stars: low-mass -
ISM: individual objects: NGC 3372 - stars: pre-main sequence -
infrared: stars
Abstract:
We performed a deep wide-field (6.76 square-degrees) near-infrared
survey with the VISTA telescope that covers the entire extent of the
Carina nebula complex. Complementing the VISTA near-infrared catalog
with Spitzer IRAC mid-infrared photometry improves the situation of
the background contamination considerably. We find that a (J-H)
versus (Ks-[4.5]) color-color diagram is well suited to tracing the
population of YSO-candidates (cYSOs) by their infrared excess. We
identify 8781 sources with strong infrared excess, which we consider
as cYSOs. This sample is used to investigate the spatial distribution
of the cYSOs with a nearest-neighbor analysis. The surface density
distribution of cYSOs agrees well with the shape of the clouds as seen
in our Herschel far-infrared survey. The strong decline in the surface
density of excess sources outside the area of the clouds supports the
hypothesis that our excess-selected sample consists predominantly of
cYSOs with a low level of background contamination.
Description:
The combined VISTA ViRCAM and Spitzer-IRAC catalog of infrared-excess
selected sources. We selected all sources under the criteria of
S/N>10, (Ks-[4.5])>0.49, and (J-H)<[(Ks-[4.5])-0.49]x2.27+0.7.
All these sources are located well outside the reddening band for
stellar photospheres.
This catalog gives all selected sources including: their J2000
equatorial coordinates the magnitudes in the J, H, Ks, and IRAC 1-4
filters, as well as the signal-to-noise ration of the photometric flux
measurements.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 116 8781 Infrared excess sources for the Vista Carina
Nebula Survey with combined Spitzer data
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See also:
J/A+A/572/A116 : The VISTA Carina Nebula Survey (Preibisch+, 2014)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name IAU designation of the source
(HHMMSS.ss+DDMMSS.s, J2000)
20- 24 F5.2 mag Jmag [9/20]?=-9.99 J-band magnitude
26- 30 F5.2 mag Hmag [8/19]?=-9.99 H-band magnitude
32- 36 F5.2 mag Ksmag [7/18]?=-9.99 Ks-band magnitude
38- 42 F5.2 mag [3.6]mag [6/16]?=-9.99 [3.6]-band magnitude
44- 48 F5.2 mag [4.5]mag [6/15]?=-9.99 [4.5]-band magnitude
50- 54 F5.2 mag [5.8]mag [5/14]?=-9.99 [5.8]-band magnitude
56- 60 F5.2 mag [8.0]mag [4/14]?=-9.99 [8.0]-band magnitude
62- 68 F7.1 mag S/N(J) [10/3965]?=-9.9 Signal-to-noise ratio of the
photometric flux measurement in J-band
70- 76 F7.1 --- S/N(H) [10/6760]?=-9.9 Signal-to-noise ratio of the
photometric flux measurement in H-band
78- 84 F7.1 --- S/N(Ks) [10/8257]?=-9.9 Signal-to-noise ratio of the
the photometric flux measurement in Ks-band
86- 92 F7.1 --- S/N(3.6) [2/17872]?=-9.9 Signal-to-noise ratio of the
photometric flux measurement in [3.6]-band
94-100 F7.1 --- S/N(4.5) [10/18288]?=-9.9 Signal-to-noise ratio of the
photometric flux measurement in [4.5]-band
102-108 F7.1 --- S/N(5.8) [2/4342]?=-9.9 Signal-to-noise ratio of the
photometric flux measurement in [5.8]-band
110-116 F7.1 --- S/N(8.0) [1/5844]?=-9.9 Signal-to-noise ratio of the
photometric flux measurement in [8.0]-band
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Acknowledgements:
Peter Zeidler, pzeidler(at)ari.uni-heidelberg.de
(End) Peter Zeidler [ARI, ZAH Heidelberg], Patricia Vannier [CDS] 15-Oct-2015