X-ray outbursts from a new transient in NGC 55
文献类型：期刊论文
| 作者 | Jithesh, V.; Wang, Zhongxiang
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-04-01 |
| 卷号 | 448期号:2页码:1973-1978 |
| 关键词 | X-rays: binaries X-rays: bursts X-rays: galaxies X-rays: general X-rays: individual: XMMU J001446.81-391123.48 |
| 英文摘要 | We report the outbursts from a newly discovered X-ray transient in the Magellanic-type, SB(s) m galaxy NGC 55. The transient source, XMMU J001446.81-391123.48, was undetectable in the 2001 XMM-Newton and 2004 Chandra observations, but detected in a 2010 XMM-Newton observation at a significance level of 9 sigma in the 0.3-8 keV energy band. The XMM-Newton spectrum is consistent with a power law with photon index Gamma = 3.17(-0.20)(+0.22), but is better fitted with a kT(in) = 0.70 +/- 0.06 keV disc blackbody. The luminosity was similar to 10(38) erg s(-1), and the source displayed strong short-term X-ray variability. These results, combined with the hardness ratios of its emission, strongly suggest an X-ray binary nature for the source. The follow-up studies with Swift XRT (X-ray Telescope) observations revealed that the source exhibited recurrent outbursts with period about a month. The XRT spectra can be described by a power law (Gamma similar to 2.5-2.9) or a disc blackbody (kT(in) similar to 0.8-1.0 keV), and the luminosity was in a range of 10(38)-10(39) erg s(-1), with no evidence showing any significant changes of the spectral parameters in the observations. Based on the X-ray spectral and temporal properties, we conclude that XMMU J001446.81-391123.48 is a new transient X-ray binary in NGC 55, which possibly contains a black hole primary. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RAPID BURSTER ; SPACED DATA ; XMM-NEWTON ; ROSAT PSPC ; CANDIDATE ; GALAXIES ; NOVAE ; TIME |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000350274500074 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/18212]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jithesh, V.,Wang, Zhongxiang. X-ray outbursts from a new transient in NGC 55[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,448(2):1973-1978. |
| APA | Jithesh, V.,&Wang, Zhongxiang.(2015).X-ray outbursts from a new transient in NGC 55.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,448(2),1973-1978. |
| MLA | Jithesh, V.,et al."X-ray outbursts from a new transient in NGC 55".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 448.2(2015):1973-1978. |
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来源：上海天文台
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