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arXiv 2005.06656astro-ph.GA
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I型超亮超新星SN 2017 egm宿主星系的空间分辨分子气体性质

Spatially Resolved Molecular Gas Properties of Host Galaxy of Type I Superluminous Supernova SN 2017egm

Bunyo Hatsukade, Kana Morokuma-Matsui, Masao Hayashi, Nozomu Tominaga, Yoichi Tamura, Kotaro Niinuma, Kazuhiro Motogi, Tomoki Morokuma, Yuichi Matsuda

摘要:

利用阿塔卡玛大型毫米/亚毫米波射电望远镜阵对一颗I型超亮超新星SN-I(SN 2017 egm)的主星系进行了CO(1-0)观测。SN 2017 egm是最近的一颗Z = 0.03063的SLSNe-I。主星系的分子气体质量为$M_{\rm gas} = (4.8 \pm 0.3) \times 10^9$ $M_{\odot}$,将其置于$M_{\rm gas}$ -恒星形成速率(SFR)平面中的正常恒星形成星系序列上。SN 2017 egm位置的分子氢柱密度高于同样位于同一宿主星系的II型SN PTF 10 bgl,以及位于不同星系的其他II型和Ia型SNe,表明SLSNe-I偏好于致密的分子气体环境。另一方面,SN 2017 egm位置处的柱密度与Ibc型SNe的柱密度相当。SN 2017 egm位置的分子气体表面密度和SFR与空间分辨的本地恒星形成星系的表面密度和SFR是一致的,并遵循Schmidt-Kennicutt关系。这些事实表明,SLSNe-I可以发生在与正常恒星形成星系相同的恒星形成机制的环境中。

英文摘要:

We present the results of CO(1-0) observations of the host galaxy of a Type I superluminous supernova (SLSN-I), SN2017egm, one of the closest SLSNe-I at z = 0.03063, by using the Atacama Large Millimeter/submillimeter Array. The molecular gas mass of the host galaxy is $M_{\rm gas} = (4.8 \pm 0.3) \times 10^9$ $M_{\odot}$, placing it on the sequence of normal star-forming galaxies in an $M_{\rm gas}$-star-formation rate (SFR) plane. The molecular hydrogen column density at the location of SN2017egm is higher than that of the Type II SN PTF10bgl, which is also located in the same host galaxy, and those of other Type II and Ia SNe located in different galaxies, suggesting that SLSNe-I have a preference for a dense molecular gas environment. On the other hand, the column density at the location of SN2017egm is comparable to those of Type Ibc SNe. The surface densities of molecular gas and the SFR at the location of SN2017egm are consistent with those of spatially resolved local star-forming galaxies and follow the Schmidt-Kennicutt relation. These facts suggest that SLSNe-I can occur in environments with the same star-formation mechanism as in normal star-forming galaxies.

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