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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) http://en.wikipedia.org/wiki/Naive_Bayes_classifier : Naive Bayes classifier definition http://cxc.harvard.edu/ciao/caveats/psf_artifact.html : about Chandra PSF Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 18 A18 --- CXOGNC CCCP name (HHMMSS.ss+DDMMSS.s 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 JHHMMSS.ss+DDMMSS.s> 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
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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