X-RAY OBSERVATIONAL SIGNATURE OF A BLACK HOLE ACCRETION DISK IN AN ACTIVE GALACTIC NUCLEUS RX J1633+4718

	X-RAY OBSERVATIONAL SIGNATURE OF A BLACK HOLE ACCRETION DISK IN AN ACTIVE GALACTIC NUCLEUS RX J1633+4718
	Yuan WM(袁为民)1,2,3 ; Liu, BF1,3 ; Zhou, H 4; Wang, TG 4
刊名	ASTROPHYSICAL JOURNAL
	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
通讯作者	Yuan, W (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
产权排序	第二完成单位
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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
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
内容类型	期刊论文
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.