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X-RAY OBSERVATIONAL SIGNATURE OF A BLACK HOLE ACCRETION DISK IN AN ACTIVE GALACTIC NUCLEUS RX J1633+4718
Yuan, W.1,2,3; Liu, B. F.1,3; Zhou, H.4; Wang, T. G.4
2010-11-01
Source PublicationASTROPHYSICAL JOURNAL
Volume723Issue:1Pages:508-513
AbstractWe 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.
KeywordGalaxies: Active Accretion Galaxies: Individual (Rx j1633+4718) Accretion Disks Galaxies: Jets Galaxies: Seyfert X-rays: Galaxies
DOI10.1088/0004-637X/723/1/508
Indexed BySCI
Language英语
WOS IDWOS:000284090100043
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7693
Collection空间科学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Yunnan Observ, Kunming, Yunnan, Peoples R China
3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming, Yunnan, Peoples R China
4.Univ Sci & Technol China, Ctr Astrophys, Key Lab Res Galaxies & Cosmol, Hefei, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Yuan, W.,Liu, B. F.,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, W.,Liu, B. F.,Zhou, H.,&Wang, T. G..(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, W.,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.
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