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J/ApJS/194/14              A Pan-Carina YSO catalog              (Povich+, 2011)

A Pan-Carina young stellar object catalog: intermediate-mass young stellar objects in the Carina nebula identified via mid-infrared excess emission. Povich M.S., Smith N., Majewski S.R., Getman K.V., Townsley L.K., Babler B.L., Broos P.S., Indebetouw R., Meade M.R., Robitaille T.P., Stassun K.G., Whitney B.A., Yonekura Y., Fukui Y. <Astrophys. J. Suppl. Ser., 194, 14 (2011)> =2011ApJS..194...14P
ADC_Keywords: YSOs ; X-ray sources ; Photometry, infrared ; Stars, masses ; Surveys Keywords: circumstellar matter - ISM: individual objects (NGC 3372) - stars: formation - stars: luminosity function, mass function - stars: pre-main sequence - X-rays: stars Abstract: We present a catalog of 1439 young stellar objects (YSOs) spanning the 1.42deg2 field surveyed by the Chandra Carina Complex Project (CCCP), which includes the major ionizing clusters and the most active sites of ongoing star formation within the Great Nebula in Carina. Candidate YSOs were identified via infrared (IR) excess emission from dusty circumstellar disks and envelopes, using data from the Spitzer Space Telescope (the Vela-Carina survey) and the Two-Micron All Sky Survey. We model the 1-24um IR spectral energy distributions of the YSOs to constrain physical properties. Our Pan-Carina YSO Catalog (PCYC) is dominated by intermediate-mass (2M<m≲10M) objects with disks, including Herbig Ae/Be stars and their less evolved progenitors. The PCYC provides a valuable complementary data set to the CCCP X-ray source catalogs, identifying 1029 YSOs in Carina with no X-ray detection. We also catalog 410 YSOs with X-ray counterparts, including 62 candidate protostars. Extrapolating over the stellar initial mass function scaled to the PCYC population, we predict a total population of >2x104 YSOs and a present-day star formation rate (SFR) of >0.008M/yr. The global SFR in the Carina Nebula, averaged over the past ∼5Myr, has been approximately constant. Description: The CCCP catalog (Broos et al., 2011, Cat. J/ApJS/194/2) contains over 14000 point sources detected by the Advanced CCD Imaging Spectrometer (ACIS) of the Chandra X-ray Observatory. Broos et al. matched the Vela-Carina Archive to the CCCP X-ray catalog and found 6543 counterparts to CCCP sources. The Vela-Carina Catalog is a subset of the Archive and provides mid-IR counterparts for 4664 CCCP sources. The Carina Nebula was observed with Spitzer/MIPS during 2007 July as part of program GO-30848 (MIPSCAR; PI: N. Smith). The Vela-Carina survey (Spitzer Proposal ID 40791, PI: S. R. Majewski) was modeled after the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE; Benjamin et al. 2003PASP..115..953B). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 114 1439 Pan-Carina YSO catalog: basic IR observational data table3.dat 70 1439 Pan-Carina YSO catalog: modeled properties and CCCP matches table4.dat 77 61 Candidate X-ray-emitting stage 0/I YSOs
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003) J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011) J/ApJS/194/9 : X-ray star clusters in the Carina complex (Feigelson+, 2011) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- PCYC Pan-Carina YSO Catalog number 6- 7 I2 h RAh Hour of Right Ascension (J2000) 9- 10 I2 min RAm Minute of Right Ascension (J2000) 12- 16 F5.2 s RAs Second of Right Ascension (J2000) 18 A1 --- DE- Sign of the Declination (J2000) 19- 20 I2 deg DEd Degree of Declination (J2000) 22- 23 I2 arcmin DEm Arcminute of Declination (J2000) 25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000) 30 A1 --- n_PCYC [AC] Origin (Archive or Catalog) (1) 32- 48 A17 --- SSTGLMA Source SSTGLM identifier (GLLL.llll+BB.bbbb) 50- 54 F5.1 mag Jmag ?=-99.9 2MASS J band magnitude (2) 56- 60 F5.1 mag Hmag ?=-99.9 2MASS H band magnitude (2) 62- 66 F5.1 mag Ksmag ?=-99.9 2MASS K_S_ band magnitude (2) 68- 72 F5.1 mag [3.6] ?=-99.9 Spitzer/IRAC 3.6um band magnitude (2) 74- 78 F5.1 mag [4.5] ?=-99.9 Spitzer/IRAC 4.5um band magnitude (2) 80- 84 F5.1 mag [5.8] ?=-99.9 Spitzer/IRAC 5.8um band magnitude (2) 86- 90 F5.1 mag [8.0] ?=-99.9 Spitzer/IRAC 8.0um band magnitude (2) 92- 96 F5.1 mag [24] ?=-99.9 Spitzer/MIPS 24um band magnitude (2) 98 I1 --- q_Jmag [0,3] Quality flag for Jmag (3) 100 I1 --- q_Hmag [0,3] Quality flag for Hmag (3) 102 I1 --- q_Ksmag [0,3] Quality flag for Ksmag (3) 104 I1 --- q_[3.6] [0,3] Quality flag for 3.6mag (3) 106 I1 --- q_[4.5] [0,3] Quality flag for 4.5mag (3) 108 I1 --- q_[5.8] [0,3] Quality flag for 5.8mag (3) 110 I1 --- q_[8.0] [0,3] Quality flag for 8.0mag (3) 112 I1 --- q_[24] [0,3] Quality flag for 24mag (3) 114 A1 --- MSX? [X] Detected by Midcourse Space Experiment? (Cat. V/114)
Note (1): Flag as follows: C = highly-reliable Vela-Carina Catalog A = more-complete Archive. Note (2): The typical photometric uncertainty is 0.1 mag. Note (3): Quality flag as follows: 0 = non-detection; 1 = detection; 2 = flux density lower limit (magnitude upper limit); 3 = flux density upper limit (magnitude lower limit).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- PCYC Pan-Carina YSO Catalog number 6- 9 F4.1 [Lsun] Lbol Mean log bolometric luminosity 11- 13 F3.1 [Lsun] e_Lbol The 1σ uncertainty in logLbol 15- 18 F4.1 Msun Mass Mean stellar mass 20- 22 F3.1 Msun e_Mass The 1σ uncertainty in Mass 24- 28 F5.1 [Msun/yr] Menv ?=-99.9 Mean envelope mass loss rate 30- 34 F5.1 [Msun/yr] e_Menv ?=-99.9 The 1σ uncertainty in logMenv 36- 38 A3 --- Stage Evolutionary stage (4) 40- 57 A18 --- CXOGNC Match with CCCP source (Cat. J/ApJS/194/2; 59- 61 A3 --- Cl Cluster/Group membership (5) 63 A1 --- Reg [A-D] Region/Cluster/Group membership (5) 65- 70 A6 --- Notes Additional note(s) (6)
Note (4): Evolutionary stage as follows: 0/I = YSOs are still embedded in their infalling, natal envelopes II = YSOs have optically thick circumstellar disks III = YSOs have optically thin disks A = "Ambiguous" See section 3 for further details. Note (5): The Membership columns follow Feigelson et al. 2011, Cat. J/ApJS/194/9 (G1-31 are X-ray groups of table 2, C1-20 are X-ray clusters of table 1 and A-D are large-scale X-ray regions of table 1). Note (6): O, P, Q, R, or Cr 232 refer to membership in the groups discussed in Section 6.2; 2X or 3X indicates that the Spitzer source was matched to 2 or 3 CCCP X-ray sources; and MSX means that the YSO is also an Midcourse Space Experiment source (Egan et al., 2003, Cat. V/114).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1 A1 --- C [HS] Hard (Emed>2keV) or Soft (Emed≤2keV) X-ray counterpart 3- 6 I4 --- PCYC Pan-Carina YSO Catalog number 8 A1 --- f_PCYC [c] Flag on PCYC 1025 (1) 10- 13 F4.1 Msun Mass Model mean stellar mass 15- 17 F3.1 Msun e_Mass The 1σ uncertainty in Mass 19- 21 F3.1 [K] logT Model mean stellar temperature 23- 25 F3.1 [K] e_logT The 1σ uncertainty in logT 27- 30 F4.1 [yr-1] logMenv/M ? Model mean envelope mass loss rate divided by Mass 32- 36 E5.2 mag Av Model mean extinction 38- 42 E5.2 mag e_Av ? The 1sigma uncertainty in Av (2) 44- 61 A18 --- CXOGNC Match with CCCP source (3) 63- 67 F5.1 ct NCts Observed net counts at 0.5-8keV (3) 69- 71 F3.1 keV Emed Observed median energy at 0.5-8keV (3) 73- 77 F5.1 [mW/m2] logFx Observed flux at total-band 0.5-8keV (3)
Note (1): c = PCYC 1025 is located in the very crowded center of the Treasure Chest, hence it is very likely a combination of multiple confused sources in the IRAC beam, and the physical association of the CCCP source with the IRAC source is highly questionable. Note (2): The probability distributions of AV,t can be strongly skewed, with long tails to high values. This often yields very large values for σ(AV,t), hence in cases where σ(AV,t)\gl<AV,t> we define Max(AV,t)=σ(AV,t). Note (3): From Table 1 of Broos et al. 2001, Cat. J/ApJS/194/2, <CXOGNC> in Simbad
History: From electronic version of the journal References: Townsley et al. CCCP introduction 2011ApJS..194....1T Broos et al. CCCP catalog Cat. J/ApJS/194/2 Getman et al. Contamination in X-ray studies 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 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 Townsley et al. Diffuse X-ray emission Cat. J/ApJS/194/15 Townsley et al. Comparison of diffuse emission 2011ApJS..194...16T
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-May-2011
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