J/ApJS/194/10 NIR properties of YSO in the CCCP (Preibisch+, 2011)
Near-infrared properties of the X-ray-emitting young stellar objects in the
Carina nebula.
Preibisch T., Hodgkin S., Irwin M., Lewis J.R., King R.R.,
McCaughrean M.J., Zinnecker H., Townsley L., Broos P.
<Astrophys. J. Suppl. Ser., 194, 10 (2011)>
=2011ApJS..194...10P 2011ApJS..194...10P
ADC_Keywords: X-ray sources ; YSOs ; Photometry, infrared
Keywords: circumstellar matter - infrared: stars - stars: pre-main sequence -
ISM: individual objects (NGC 3372) - stars: formation - X-rays: stars
Abstract:
The Great Nebula in Carina (NGC 3372) is the best target to study in
detail the process of violent massive star formation and the resulting
feedback effects of cloud dispersal and triggered star formation.
While the population of massive stars is rather well studied, the
associated low-mass stellar population was largely unknown up to now.
The near-infrared study in this paper builds on the results of the
Chandra Carina Complex Project, that detected 14368 X-ray sources in
the 1.4deg2 survey region, an automatic source classification study
that classified 10714 of these X-ray sources as very likely young
stars in Carina, and an analysis of the clustering properties of the
X-ray-selected Carina members. In order to determine physical
properties of the X-ray-selected stars, most of which were previously
unstudied, we used HAWK-I at the ESO Very Large Telescope to conduct a
very deep near-IR survey with subarcsecond angular resolution,
covering an area of about 1280arcmin2. The HAWK-I images reveal more
than 600000 individual infrared sources, whereby objects as faint as
J∼23, H∼22, and Ks∼21 are detected at signal-to-noise ratio (S/N)≥3.
While less than half of the Chandra X-ray sources have counterparts in
the Two Micron All Sky Survey catalog, the ∼5mag deeper HAWK-I data
reveal infrared counterparts to 6636 (=88.8%) of the 7472 Chandra
X-ray sources in the HAWK-I field. We analyze near-infrared
color-color and color-magnitude diagrams to derive information about
the extinctions, infrared excesses (as tracers for circumstellar
disks), ages, and masses of the X-ray-selected objects.
Description:
HAWK-I is the new near-infrared imager at the ESO 8m Very Large
Telescope, available since the year 2008. The data discussed in this
paper are derived from images taken through the standard broadband J,
H, and Ks filters.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 38 7472 Near-infrared magnitudes for the 7472 Chandra
X-ray sources in the area of the HAWK-I mosaic
--------------------------------------------------------------------------------
See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011)
J/ApJS/194/14 : A Pan-Carina YSO catalog (Broos+, 2011)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- CCCP CCCP X-ray source number
7- 11 F5.2 mag Jmag ?=-9.99 The HAWK-I J band magnitude
13- 16 F4.2 mag e_Jmag ?=0 The one sigma error in the Jmag (1)
18- 22 F5.2 mag Hmag ?=-9.99 The HAWK-I H band magnitude
24- 27 F4.2 mag e_Hmag ?=0 The one sigma error in the Hmag (1)
29- 33 F5.2 mag Ksmag ?=-9.99 The HAWK-I Ks band magnitude
35- 38 F4.2 mag e_Ksmag ?=0 The one sigma error in the Ksmag (1)
--------------------------------------------------------------------------------
Note (1): The given errors are the statistical errors reported from
photometry routine and do not include possible systematic
uncertainties (see discussion in the paper).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Townsley et al. CCCP introduction 2011ApJS..194....1T 2011ApJS..194....1T
Broos et al. CCCP catalog Cat. J/ApJS/194/2
Getman et al. Contamination in X-ray studies 2011ApJS..194....3G 2011ApJS..194....3G
Broos et al. Source classifier Cat. J/ApJS/194/4
Gagne et al. O and B stars Cat. J/ApJS/194/5
Povich et al. Cand. X-ray emitting OB stars Cat. J/ApJS/194/6
Naze et al. O and B stars X-ray properties Cat. J/ApJS/194/7
Parkin et al. QZ Car (HD 93206) 2011ApJS..194....8P 2011ApJS..194....8P
Feigelson et al. X-ray star clusters Cat. J/ApJS/194/9
Preibisch et al. NIR properties of YSO Cat. J/ApJS/194/10
Wang et al. Trumpler 15 Cat. J/ApJS/194/11
Wolk et al. Trumpler 16 Cat. J/ApJS/194/12
Povich et al. Pan-Carina YSO catalog Cat. J/ApJS/194/14
Evans et al. Companions of B stars in Tr 16 2011ApJS..194...13E 2011ApJS..194...13E
Townsley et al. Diffuse X-ray emission Cat. J/ApJS/194/15
Townsley et al. Comparison of diffuse emission 2011ApJS..194...16T 2011ApJS..194...16T
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-May-2011