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TRANSIENT SUPERSTRONG CORONAL LINES AND BROAD BUMPS IN THE GALAXY SDSS J074820.67+471214.3
Wang, Ting-Gui1,2; Zhou, Hong-Yan1,2,3; Wang, Li-Fan4; Lu, Hong-Lin1,5; Xu, Dawei6
2011-10-20
发表期刊ASTROPHYSICAL JOURNAL
卷号740期号:2
摘要Variable superstrong coronal emission lines were observed in the spectrum of one galaxy, SDSS J095209.56+214313.3, and their enigmatic origin remains controversial. In this paper, we report the detection of variable broad emission bumps reminiscent of a supernova (SN) II-Plateau spectra taken a few days after the shock breakout in a second galaxy with variable superstrong coronal lines, SDSS J074820.67+471214.3. The coronal line spectrum shows unprecedentedly high ionization with superstrong [Fe X]lambda 6376, [Fe XI]lambda 7894, [Fe XIV]lambda 5304, [S XII]lambda 7612, and [Ar XIV]lambda 4414, but without detectable optical [Fe VII] line emission. The coronal line luminosities are similar to those observed in bright Seyfert galaxies and 20 times more luminous than those reported in the hottest Type IIn SN 2005ip inferred from its strong coronal lines. The coronal lines (sigma similar to 120-240 km s(-1)) are much broader than the narrow emission lines (sigma similar to 40 km s(-1)) from the star-forming regions in the galaxy, but are nearly at the same systematic redshift. We also detected a variable non-stellar continuum emission from its Sloan Digital Sky Survey spectroscopy and Galaxy Evolution Explorer photometry. In the follow-up spectra taken 4-5 years later, the coronal lines, SN-like feature, and non-stellar continuum disappeared, while the [O III]lambda 5007 intensity increased by a factor of about 10. Our analysis suggests that the coronal line region should be at least 10 light days in size and should be powered either by a steady ionizing source with a soft X-ray luminosity of at least a few 10(42) erg s(-1) or by a very luminous soft X-ray outburst. These findings can be more naturally explained by a star tidally disrupted by the central black hole than by an SN explosion. The similarity of the coronal line variability trend observed in the two galaxies suggests that the two transient events have the same origin, with SDSS J074820.67+471214.3 being caught at an earlier stage by the spectroscopic observation.
关键词Galaxies: Nuclei Line: Formation Supernovae: General
DOI10.1088/0004-637X/740/2/85
收录类别SCI
语种英语
WOS记录号WOS:000296762900035
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8097
专题空间科学研究部
作者单位1.Chinese Acad Sci, Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
2.USTC, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China
3.Polar Res Inst China, Shanghai 200136, Peoples R China
4.Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA
5.USTC, Phys Expt Teaching Ctr, Hefei 230026, Anhui, Peoples R China
6.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Wang, Ting-Gui,Zhou, Hong-Yan,Wang, Li-Fan,et al. TRANSIENT SUPERSTRONG CORONAL LINES AND BROAD BUMPS IN THE GALAXY SDSS J074820.67+471214.3[J]. ASTROPHYSICAL JOURNAL,2011,740(2).
APA Wang, Ting-Gui,Zhou, Hong-Yan,Wang, Li-Fan,Lu, Hong-Lin,&Xu, Dawei.(2011).TRANSIENT SUPERSTRONG CORONAL LINES AND BROAD BUMPS IN THE GALAXY SDSS J074820.67+471214.3.ASTROPHYSICAL JOURNAL,740(2).
MLA Wang, Ting-Gui,et al."TRANSIENT SUPERSTRONG CORONAL LINES AND BROAD BUMPS IN THE GALAXY SDSS J074820.67+471214.3".ASTROPHYSICAL JOURNAL 740.2(2011).
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