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A statistical analysis of point-like sources in the Chandra Galactic Center Survey
Wu, JF; Zhang SN(张双南); Lu FJ(卢方军); Zhang, SN; Lu, FJ; Jin, YK
Corresponding AuthorWu, JF (reprint author), Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA.
AbstractThe Chandra Galactic Center Survey detected similar to 800 X-ray point-like sources in the 2 degrees x 0.8 degrees sky region around the Galactic Center. We study the spatial and luminosity distributions of these sources according to their spectral properties. Fourteen bright sources detected are used to fit jointly an absorbed power-law model, from which the power-law photon index is determined to be similar to 2.5. Assuming that all other sources have the same power-law form, the relation between hardness ratio and HI column density N-H is used to estimate the NH values for all sources. Monte Carlo simulations show that these sources are more likely concentrated in the Galactic center region, rather than distributed throughout the Galactic disk. We also find that the luminosities of the sources are positively correlated with their HI column densities, i.e., a more luminous source has a higher HI column density. From this relation, we suggest that the X-ray luminosity comes from the interaction between an isolated old neutron star and interstellar medium (mainly dense molecular clouds). Using the standard Bondi accretion theory and the statistical information of molecular clouds in the Galactic center, we confirm this positive correlation and calculate the luminosity range in this scenario, which is consistent with the observation (10(32)-10(35) erg s(-1)).
Keywordmethods : data analysis Galaxy : center X-ray : stars
Subject AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000244675200005
ADS Bibcode2007ChJAA...7...81W
ADS URLhttps://ui.adsabs.harvard.edu/abs/2007ChJAA...7...81W
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2007ChJAA...7...81W/citations
Citation statistics
Cited Times:2 [INSPIRE]
Cited Times:5 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Wu, JF,Zhang SN,Lu FJ,et al. A statistical analysis of point-like sources in the Chandra Galactic Center Survey[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2007,7(1):#REF!.
APA Wu, JF,张双南,卢方军,Zhang, SN,Lu, FJ,&Jin, YK.(2007).A statistical analysis of point-like sources in the Chandra Galactic Center Survey.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,7(1),#REF!.
MLA Wu, JF,et al."A statistical analysis of point-like sources in the Chandra Galactic Center Survey".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 7.1(2007):#REF!.
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