CHANDRA ACIS SURVEY OF X-RAY POINT SOURCES IN NEARBY GALAXIES. II. X-RAY LUMINOSITY FUNCTIONS AND ULTRALUMINOUS X-RAY SOURCES
文献类型：期刊论文
| 作者 | Wang, Song1 ; Qiu, Yanli1,2; Liu, Jifeng1,3; Bregman, Joel N.4; Wang,Song; Liu,Jifeng
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-09-20 |
| 卷号 | 829期号:1 |
| 关键词 | catalogs galaxies: general X-rays: binaries X-rays: galaxies |
| 英文摘要 | Based on the recently completed Chandra/ACIS survey of X-ray point sources in nearby galaxies, we study the X-ray luminosity functions (XLFs) for X-ray point sources in different types of galaxies and the statistical properties of ultraluminous X-ray sources (ULXs). Uniform procedures are developed to compute the detection threshold, to estimate the foreground/background contamination, and to calculate the XLFs for individual galaxies and groups of galaxies, resulting in an XLF library of 343 galaxies of different types. With the large number of surveyed galaxies, we have studied the XLFs and ULX properties across different host galaxy types, and confirm with good statistics that the XLF slope flattens from lenticular (alpha similar to 1.50 +/- 0.07) to elliptical (similar to 1.21 +/- 0.02), to spirals (similar to 0.80 +/- 0.02), to peculiars (similar to 0.55 +/- 0.30), and to irregulars (similar to 0.26 +/- 0.10). The XLF break dividing the neutron star and black hole binaries is also confirmed, albeit at quite different break luminosities for different types of galaxies. A radial dependency is found for ellipticals, with a flatter XLF slope for sources located between D25 and 2D(25), suggesting the XLF slopes in the outer region of early-type galaxies are dominated by low-mass X-ray binaries in globular clusters. This study shows that the ULX rate in early-type galaxies is 0.24 +/- 0.05 ULXs per surveyed galaxy, on a 5 sigma confidence level. The XLF for ULXs in late-type galaxies extends smoothly until it drops abruptly around 4 x 10(40) erg s(-1), and this break may suggest a mild boundary between the stellar black hole population possibly including 30 M-circle dot black holes with super-Eddington radiation and intermediate mass black holes. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STAR-FORMATION RATE ; FORMATION RATE INDICATOR ; HUBBLE-SPACE-TELESCOPE ; MASS BLACK-HOLES ; ELLIPTIC GALAXIES ; GLOBULAR-CLUSTERS ; SOURCE CATALOG ; STELLAR MASS ; FORMING GALAXIES ; DEEP CHANDRA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000385374500020 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6907]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Chinese Acad Sci, Coll Astron & Space Sci, Beijing 100049, Peoples R China 4.Univ Michigan, Ann Arbor, MI 48109 USA |
| 推荐引用方式 GB/T 7714 | Wang, Song,Qiu, Yanli,Liu, Jifeng,et al. CHANDRA ACIS SURVEY OF X-RAY POINT SOURCES IN NEARBY GALAXIES. II. X-RAY LUMINOSITY FUNCTIONS AND ULTRALUMINOUS X-RAY SOURCES[J]. ASTROPHYSICAL JOURNAL,2016,829(1). |
| APA | Wang, Song,Qiu, Yanli,Liu, Jifeng,Bregman, Joel N.,Wang,Song,&Liu,Jifeng.(2016).CHANDRA ACIS SURVEY OF X-RAY POINT SOURCES IN NEARBY GALAXIES. II. X-RAY LUMINOSITY FUNCTIONS AND ULTRALUMINOUS X-RAY SOURCES.ASTROPHYSICAL JOURNAL,829(1). |
| MLA | Wang, Song,et al."CHANDRA ACIS SURVEY OF X-RAY POINT SOURCES IN NEARBY GALAXIES. II. X-RAY LUMINOSITY FUNCTIONS AND ULTRALUMINOUS X-RAY SOURCES".ASTROPHYSICAL JOURNAL 829.1(2016). |
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来源：国家天文台
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