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X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS
Ai, Y. L.1,4; Yuan, W.2,4; Zhou, H. Y.3; Wang, T. G.3; Zhang, S. H.3
2011-01-20
Source PublicationASTROPHYSICAL JOURNAL
Volume727Issue:1
AbstractNarrow-line Seyfert 1 galaxies (NLS1s) with very small broadline widths (say, FWHM(H beta) less than or similar to 1200 km s(-1)) represent the extreme type of Seyfert 1 galaxies that have small black hole masses (M-BH) and/or high Eddington ratios (L/L-Edd). Here, we study the X-ray properties of a homogeneously and optically selected sample of 13 such objects, termed as very narrow line Seyfert 1 galaxies, using archival XMM-Newton data. It is found that the Fe K alpha emission line is at most weak in these objects. A soft X-ray excess is ubiquitous, with the thermal temperatures falling within a strict range of 0.1-0.2 keV. Our result highlights the puzzling independence of the thermal temperature by extending the relations to even smaller FWHM(H beta), i.e., smaller M-BH (similar to 10(6) M-circle dot) and/or higher L/L-Edd. The excess emission can be modeled by a range of viable models, though the disk reflection and Comptonization models generally give somewhat better fits over the smeared absorption and the p-free models. At the Eddington ratios around unity and above, the X-ray spectral slopes in the 2-10 keV band are systematically flatter than the predictions of the relationship with L/L-Edd suggested previously. Short timescale (1-2 hr) X-ray variability is common, which, together with the variability amplitude computed for some of the objects, is supportive of the scenario that NLS1s are indeed active galactic nuclei with relatively small M-BH.
KeywordGalaxies: Active Galaxies: Seyfert X-rays: Galaxies
DOI10.1088/0004-637X/727/1/31
Indexed BySCI
Language英语
WOS IDWOS:000285992000031
Citation statistics
Cited Times:33[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8050
Collection空间科学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming, Yunnan, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Ctr Astrophys, Hefei, Anhui, Peoples R China
4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Ai, Y. L.,Yuan, W.,Zhou, H. Y.,et al. X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS[J]. ASTROPHYSICAL JOURNAL,2011,727(1).
APA Ai, Y. L.,Yuan, W.,Zhou, H. Y.,Wang, T. G.,&Zhang, S. H..(2011).X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS.ASTROPHYSICAL JOURNAL,727(1).
MLA Ai, Y. L.,et al."X-RAY PROPERTIES OF NARROW-LINE SEYFERT 1 GALAXIES WITH VERY SMALL BROADLINE WIDTHS".ASTROPHYSICAL JOURNAL 727.1(2011).
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