X-RAY OBSERVATIONAL SIGNATURE OF A BLACK HOLE ACCRETION DISK IN AN ACTIVE GALACTIC NUCLEUS RX J1633+4718
文献类型:期刊论文
作者 | Yuan WM(袁为民)1,2,3![]() ![]() |
刊名 | ASTROPHYSICAL JOURNAL
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出版日期 | 2010-11-01 |
卷号 | 723期号:1页码:508-513 |
关键词 | accretion, accretion disks galaxies: active galaxies: individual (RX J1633+4718) galaxies: jets galaxies: Seyfert X-rays: galaxies |
ISSN号 | 0004-637X |
产权排序 | 第二完成单位 |
通讯作者 | Yuan, W (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China. |
英文摘要 | We report the discovery of a luminous ultra-soft X-ray excess in a radio-loud narrow-line Seyfert 1 galaxy, RX J1633+4718, from archival ROSAT observations. The thermal temperature of this emission, when fitted with a blackbody, is as low as 32.5(-6.0)(+8.0) eV. This is in remarkable contrast to the canonical temperatures of similar to 0.1-0.2 keV found hitherto for the soft X-ray excess in active galactic nuclei (AGNs) and is interestingly close to the maximum temperature predicted for a postulated accretion disk in this object. If this emission is indeed blackbody in nature, the derived luminosity (3.5(-1.5)(+3.3) x 10(44) erg s(-1)) infers a compact emitting area with a size (similar to 5 x 10(12) cm or 0.33 AU in radius) that is comparable to several times the Schwarzschild radius of a black hole (BH) at the mass estimated for this AGN (similar to 3 x 10(6) M(circle dot)). In fact, this ultra-steep X-ray emission can be well fitted as the (Compton scattered) Wien tail of the multi-temperature blackbody emission from an optically thick accretion disk, whose inferred parameters (BH mass and accretion rate) are in good agreement with independent estimates using the optical emission-line spectrum. We thus consider this feature as a signature of the long-sought X-ray radiation directly from a disk around a supermassive BH, presenting observational evidence for a BH accretion disk in the AGN. Future observations with better data quality, together with improved independent measurements of the BH mass, may constrain the spin of the BH. |
WOS标题词 | Science & Technology ; Physical Sciences |
学科主题 | Astronomy & Astrophysics |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | LINE SEYFERT-1 GALAXIES ; ALL-SKY SURVEY ; EMISSION-LINE ; SOFT EXCESS ; QUASARS ; SPECTRA ; ROSAT ; MASS ; AGN ; REFLECTION |
收录类别 | SCI |
原文出处 | http://iopscience.iop.org/0004-637X/723/1/508/ |
语种 | 英语 |
WOS记录号 | WOS:000284090100043 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/4993] ![]() |
专题 | 云南天文台_高能天体物理研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
作者单位 | 1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 2.Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan, P.O. BOX 110, China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China 4.Key Laboratory for Research in Galaxies and Cosmology, Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, China |
推荐引用方式 GB/T 7714 | Yuan WM,Liu, BF,Zhou, H,et al. X-RAY OBSERVATIONAL SIGNATURE OF A BLACK HOLE ACCRETION DISK IN AN ACTIVE GALACTIC NUCLEUS RX J1633+4718[J]. ASTROPHYSICAL JOURNAL,2010,723(1):508-513. |
APA | Yuan WM,Liu, BF,Zhou, H,&Wang, TG.(2010).X-RAY OBSERVATIONAL SIGNATURE OF A BLACK HOLE ACCRETION DISK IN AN ACTIVE GALACTIC NUCLEUS RX J1633+4718.ASTROPHYSICAL JOURNAL,723(1),508-513. |
MLA | Yuan WM,et al."X-RAY OBSERVATIONAL SIGNATURE OF A BLACK HOLE ACCRETION DISK IN AN ACTIVE GALACTIC NUCLEUS RX J1633+4718".ASTROPHYSICAL JOURNAL 723.1(2010):508-513. |
入库方式: OAI收割
来源:云南天文台
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