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NTT, SPITZER, AND CHANDRA SPECTROSCOPY OF SDSSJ095209.56+214313.3: THE MOST LUMINOUS CORONAL-LINE SUPERNOVA EVER OBSERVED, OR A STELLAR TIDAL DISRUPTION EVENT?
Komossa, S.1; Zhou, H.1,6; Rau, A.2; Dopita, M.3; Gal-Yam, A.4; Greiner, J.1; Zuther, J.5; Salvato, M.2; Xu, D.7; Lu, H.1,6; Saxton, R.8; Ajello, M.9,10
2009-08-10
发表期刊ASTROPHYSICAL JOURNAL
卷号701期号:1页码:105-121
摘要The galaxy SDSSJ095209.56+214313.3 (SDSSJ0952+2143 hereafter) showed remarkable emission-line and continuum properties and strong emission-line variability first reported in 2008 (Paper I). The spectral properties and low-energy variability are the consequence of a powerful high-energy flare which was itself not observed directly. Here we report follow-up optical, near-infrared (NIR), mid-infrared (MIR), and X-ray observations of SDSSJ0952+2143. We discuss outburst scenarios in terms of stellar tidal disruption by a supermassive black hole, peculiar variability of an active galactic nucleus (AGN), and a supernova (SN) explosion, and possible links between these scenarios and mechanisms. The optical spectrum of SDSSJ0952+2143 exhibits several peculiarities: an exceptionally high ratio of [Fe VII] transitions over [O III], a dramatic decrease by a factor of 10 of the highest-ionization coronal lines, a very unusual and variable Balmer line profile including a triple-peaked narrow component with two unresolved horns, and a large Balmer decrement. The MIR emission measured with the Spitzer IRS in the narrow 10-20 mu m band is extraordinarily luminous and amounts to L(10-20) mu m = 3.5 x 10(43) erg s(-1). The IRS spectrum shows a bump around similar to 11 mu m and an increase toward longer wavelengths, reminiscent of silicate emission. The strong MIR excess over the NIR implies the dominance of relatively cold dust. The pre- and post-flare NIR host galaxy colors indicate a nonactive galaxy. The X-ray luminosity of L(x,0.1-10 keV) = 10(41) erg s(-1) measured with Chandra is below that typically observed in AGNs. Similarities of SDSSJ0952+2143 with some extreme SNe suggest the explosion of a SN of Type IIn. However, an extreme accretion event in a low-luminosity AGN or inactive galaxy, especially stellar tidal disruption, remain possibilities, which could potentially produce a very similar emission-line response. If indeed a SN, SDSSJ0952+2143 is one of the most distant X-ray- and MIR-detected SNe known so far, the most MIR luminous, and one of the most X-ray luminous. It is also by far the most luminous (> 10(40) erg s(-1)) in high-ionization coronal lines, exceeding previous SNe by at least a factor of 100.
关键词Circumstellar Matter Galaxies: General Galaxies: Individual (sdssj095209.56+214313.3) Supernovae: General
DOI10.1088/0004-637X/701/1/105
收录类别SCI
语种英语
WOS记录号WOS:000268341800011
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7940
专题光学天文研究部
作者单位1.Max Planck Inst Extraterr Phys, D-85741 Garching, Germany
2.CALTECH, Pasadena, CA 91125 USA
3.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
4.Weizmann Inst Sci, Benoziyo Ctr Astrophys, IL-76100 Rehovot, Israel
5.Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany
6.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China
7.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
8.ESA ESAC, Madrid 28691, Spain
9.SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA
10.KIPAC, Menlo Pk, CA 94025 USA
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Komossa, S.,Zhou, H.,Rau, A.,et al. NTT, SPITZER, AND CHANDRA SPECTROSCOPY OF SDSSJ095209.56+214313.3: THE MOST LUMINOUS CORONAL-LINE SUPERNOVA EVER OBSERVED, OR A STELLAR TIDAL DISRUPTION EVENT?[J]. ASTROPHYSICAL JOURNAL,2009,701(1):105-121.
APA Komossa, S..,Zhou, H..,Rau, A..,Dopita, M..,Gal-Yam, A..,...&Ajello, M..(2009).NTT, SPITZER, AND CHANDRA SPECTROSCOPY OF SDSSJ095209.56+214313.3: THE MOST LUMINOUS CORONAL-LINE SUPERNOVA EVER OBSERVED, OR A STELLAR TIDAL DISRUPTION EVENT?.ASTROPHYSICAL JOURNAL,701(1),105-121.
MLA Komossa, S.,et al."NTT, SPITZER, AND CHANDRA SPECTROSCOPY OF SDSSJ095209.56+214313.3: THE MOST LUMINOUS CORONAL-LINE SUPERNOVA EVER OBSERVED, OR A STELLAR TIDAL DISRUPTION EVENT?".ASTROPHYSICAL JOURNAL 701.1(2009):105-121.
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