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J/ApJS/194/9     X-ray star clusters in the Carina complex    (Feigelson+, 2011)

X-ray star clusters in the Carina complex. Feigelson E.D., Getman K.V., Townsley L.K., Broos P.S., Povich M.S., Garmire G.P., King R.R., Montmerle T., Preibisch T., Smith N., Stassun K.G., Wang J., Wolk S., Zinnecker H. <Astrophys. J. Suppl. Ser., 194, 9 (2011)> =2011ApJS..194....9F
ADC_Keywords: Clusters, open ; Associations, stellar ; X-ray sources ; Surveys Keywords: ISM: individual objects (Carina Nebula) - open clusters and associations: individual (Trumpler 14, Trumpler 15, Trumpler 16, Collinder 228, C) - stars: formation - stars: pre-main sequence - X-rays: stars Abstract: The distribution of young stars found in the Chandra Carina Complex Project (CCCP) is examined for clustering structure. X-ray surveys are advantageous for identifying young stellar populations compared to optical and infrared surveys in suffering less contamination from nebular emission and Galactic field stars. The analysis is based on smoothed maps of a spatially complete subsample of ∼3000 brighter X-ray sources classified as Carina members and ∼10000 stars from the full CCCP sample. The principal known clusters are recovered, and some additional smaller groups are identified. No rich embedded clusters are present, although a number of sparse groups are found. The CCCP reveals considerable complexity in clustering properties. Description: The CCCP observations and their analysis are described in detail by Townsley et al. (2011ApJS..194....1T) and Broos et al. (2011, Cat. J/ApJS/194/2). Twenty-two overlapping pointings with the Chandra Advanced CCD Imaging Spectrometer (ACIS), each subtending 17'x17', were observed. They cover a 1.4deg2 region. The X-ray data are aligned to the Two Micron All Sky Survey (2MASS)/Hipparcos frame and, in most cases, source positions have accuracies better than 0.5". Infrared counterparts are found by positional coincidences with 2MASS, VLT HAWK-I (Preibisch et al. 2011, Cat. J/ApJS/194/10), and other published catalogs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 145 24 Principal clusters of X-ray stars in the Carina star-forming complex (see section 3.1) table2.dat 47 31 Small groups of X-ray stars outside of major clusters table3.dat 87 14368 Carina cluster membership
See also: J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011) J/ApJS/194/4 : Source classifier for X-ray sources (Broos+, 2011) J/ApJS/194/5 : Carina OB stars in the CCCP catalog (Gagne+, 2011) J/ApJS/194/10 : NIR properties of YSO in the CCCP (Preibisch+, 2011) J/ApJS/194/14 : A Pan-Carina YSO catalog (Povich+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 A2 --- ClReg CCCP-Cl source identification (1) 4 A1 --- f_ClReg [d] Flag on CCCP-Cl D (1) 6- 7 I2 h RAh ? X-ray Hour of right ascension (J2000) (2) 9- 10 I2 min RAm ? X-ray Minute of right ascension (J2000) 12- 15 F4.1 s RAs ? X-ray Second of right ascension (J2000) 17 A1 --- DE- ? X-ray Sign of the declination (J2000) (2) 18- 19 I2 deg DEd ? X-ray Degree of declination (J2000) 21- 22 I2 arcmin DEm ? X-ray Arcminute of declination (J2000) 24- 25 I2 arcsec DEs ? X-ray Arcsecond of declination (J2000) 27- 28 A2 --- Cntr Contour (3) 30- 33 I4 --- N Star population of the cluster 35- 38 I4 --- Nmed Cluster members for wich Emed is available 40- 43 F4.2 keV Emed Average of the observed median X-ray event energy statistic 45- 48 F4.2 keV e_Emed Standard deviation of Emed 50- 51 I2 mag AV Visual absorption (4) 53- 74 A22 --- OName Opt/IR cluster identification(s) (5) 76 A1 --- f_OName [s] s: Cluster within the Collinder 228 and South Pillars region (see section 5.2) 78- 89 A12 --- Star1 First optical dominant star 91-115 A25 --- SpType1 MK spectral type for Star1 (6) 117 A1 --- Fig1 [a-y] Letter which identify Star1 in figure 2 119-130 A12 --- Star2 Second optical dominant star 132-143 A12 --- SpType2 MK spectral type for Star2 (6) 145 A1 --- Fig2 [b-t] Letter which identify Star2 in figure 2
Note (1): Clusters are numbered 1-20; regions are A, B, C or D, and have no position. The region D contains stars not assigned to clusters 1-20 nor regions A-C. Note (2): The cluster positions represent the surface density peaks; due to non-spherical distributions, these may not correspond to mean or median positions of the member stars. Note (3): Contour counted from the lowest contour in figure 1(b)). For example, contour "2m" represents the second lowest contour where "m" is appended when the contour was modified to produce a closed boundary. Note (4): Visual absorption, AV, can be estimated from the gas column densities, NH, inferred from <Emed> assuming standard gas-to-dust ratios (Vuong et al. 2003A&A...408..581V). These AV estimates, ranging from AV∼2 to 10mag, are reported with low precision. Note (5): Correspondences to previously known optical and near-infrared star clusters are established visually from maps given by Feinstein (1995RMxAC...2...57F) and Smith & Brooks (2008hsf2.book..138S). Note that Trumpler 16 is divided into seven clusters in our analysis. Associations with mid-infrared clusters in the South Pillars region are based on the Spitzer IRAC study of Smith et al. (2010MNRAS.406..952S). Note (6): Spectral type from Gagne et al. (2011, Cat. J/ApJS/194/5) or Simbad.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Gp [1/31] CCCP-Gp source identification 4- 5 I2 h RAh X-ray Hour of right ascension (J2000) 7- 8 I2 min RAm X-ray Minute of right ascension (J2000) 10- 13 F4.1 s RAs X-ray Second of right ascension (J2000) 15 A1 --- DE- X-ray Sign of the declination (J2000) 16- 17 I2 deg DEd X-ray Degree of declination (J2000) 19- 20 I2 arcmin DEm X-ray Arcminute of declination (J2000) 22- 23 I2 arcsec DEs X-ray Arcsecond of declination (J2000) 25- 26 I2 --- N Star population of the cluster 28- 29 I2 --- Nmed Cluster members for which Emed is available 31- 34 F4.2 keV Emed ? Average of the observed median X-ray event energy statistic 36- 39 F4.2 keV e_Emed ? Standard deviation of Emed 41- 43 I3 mag AV ? Visual absorption 45 A1 --- Cluster [ABJLMN] Spitzer cluster identification 47 A1 --- f_Cluster [s] s: Cluster within the Collinder 228 and South Pillars region (see section 5.2)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- CCCP CCCP source number (<[BTF2011] CCCP NNNNN> in Simbad) 7- 16 A10 --- Label CCCP source label (1) 18- 35 A18 --- CXOGNC IAU designation (HHMMSS.ss+DDMMSS.s) 37- 46 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 48- 57 F10.6 deg DEdeg Declination in decimal degrees (J2000) 59- 65 F7.1 ct Ncts Net counts 67- 71 F5.2 [ct/s/cm2] Flux2 Log photometric flux in the "total" 0.5-8keV Chandra band; photons/s/cm2 73- 78 F6.2 keV Emed ?=-99 Median X-ray energy 80- 81 A2 --- Class Source membership class (2) 83- 85 A3 --- ClGp Cluster/Group membership (3) 87 A1 --- Reg [A-D] Large-scale region membership (4)
Note (1): Source labels identify a CCCP pointing; they do not convey membership in astrophysical clusters. Note (2): Class from Broos et al., 2011, Cat. J/ApJS/194/4, as follows: H0 = ambiguous source; H1 = probable foreground star; H2 = probable Carina member; H3 = probable background star; H4 = probable extragalactic contaminant. Note (3): Designations "C1","C2", ..., "C20" refer to the 20 X-ray clusters in Table 1. Designations "G1", "G2", ..., "G31" refer to the 31 X-ray groups in Table 2. Note (4): Designations "A", "B", "C", and "D" refer to the large-scale X-ray regions in Table 1.
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] 26-May-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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