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J/ApJS/194/4      Classification of CCCP X-ray sources           (Broos+, 2011)

A Naive Bayes source classifier for X-ray sources. Broos P.S., Getman K.V., Povich M.S., Townsley L.K., Feigelson E.D., Garmire G.P. <Astrophys. J. Suppl. Ser., 194, 4 (2011)> =2011ApJS..194....4B
ADC_Keywords: X-ray sources ; Surveys ; Nebulae ; Associations, stellar Keywords: methods: data analysis - methods: statistical - stars: pre-main sequence - X-rays: general - X-rays: stars Abstract: The Chandra Carina Complex Project (CCCP) provides a sensitive X-ray survey of a nearby starburst region over >1deg2 in extent. Thousands of faint X-ray sources are found, many concentrated into rich young stellar clusters. However, significant contamination from unrelated Galactic and extragalactic sources is present in the X-ray catalog. We describe the use of a Naive Bayes classifier to assign membership probabilities to individual sources, based on source location, X-ray properties, and visual/infrared properties. For the particular membership decision rule adopted, 75% of CCCP sources are classified as members, 11% are classified as contaminants, and 14% remain unclassified. The resulting sample of stars likely to be Carina members is used in several other studies, which appear in this special issue devoted to the CCCP. Description: Broos et al. (2011, Cat. J/ApJS/194/2) and citations therein describe the X-ray, visual, NIR, and MIR measurements available for CCCP sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 94 14368 Classification quantities for CCCP sources
See also: J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011) : Naive Bayes classifier definition : about Chandra PSF Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 18 A18 --- CXOGNC CCCP name ( format) (1) 20- 23 F4.2 --- H1-Pr H1 (foreground*) prior class probability 25- 28 F4.2 --- H2-Pr H2 (Car YSO) prior class probability 30- 33 F4.2 --- H3-Pr H3 (background*) prior class probability 35- 38 F4.2 --- H4-Pr H4 (extragalactic) prior class probability 40- 44 F5.2 --- H1-Pst ?=-9.9 H1 (foreground*) posterior probability 46- 50 F5.2 --- H2-Pst ?=-9.9 H2 (Car YSO) posterior probability 52- 56 F5.2 --- H3-Pst ?=-9.9 H3 (background*) posterior probability 58- 62 F5.2 --- H4-Pst ?=-9.9 H4 (extragalactic) posterior probability 64 I1 --- Class [0,4] Assigned classification (2) 66- 69 F4.1 keV Emed ?=-9.9 Median energy 71- 74 F4.1 [cm-2/s] logF Log of total X-ray photon flux 76- 79 F4.1 [cm-2] logNH ?=-9.9 log(H column density) for YSOs (H2 class) 81- 84 F4.1 [10-7W] logL ?=-9.9 log(total X-ray luminosity) for YSOs (H2) 86- 89 F4.1 [cm-2] logNHo ?=-9.9 log(H column density) for non-YSO sources 91- 94 F4.1 [10-7W] logLo ?=-9.9 log(total X-ray luminosity) for non-YSOs.
Note (1): The first 14368 sources of the CCCP catalog (Broos et al., 2011, Cat. J/ApJS/194/2), sorted by RA; the 14369th source in the CCCP catalog was identified too late in the data analysis process to be included. Names are <CXOGNC> in Simbad. Note (2): Classification as follows: 1 = class H1 (foreground Galactic field star): Prob(H1|F)>2*max{Prob(H2|F),Prob(H3|F),Prob(H4|F)}; 716 sources 2 = class H2 (Carina young star): Prob(H2|F)>2*max{Prob(H1|F),Prob(H3|F),Prob(H4|F)}; 10714 sources 3 = class H3 (background Galactic field star): Prob(H3|F)>2*max{Prob(H1|F),Prob(H2|F),Prob(H4|F)}; 16 sources 4 = Class H4 (extragalactic): Prob(H4|F)>2*max{Prob(H1|F),Prob(H2|F),Prob(H3|F)}; 877 sources 0 = Unclassified; 2045 sources See section 4.4 for further details.
History: * 24-May-2011: From electronic version of the journal * 17-Jun-2011: corrected CXOGNC names supplied by the author on request (original CXOGNC names missed their 3 last characters corresponding to seconds and tenths of seconds) 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] 24-May-2011
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