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题名: IC 630: Piercing the Veil of the Nuclear Gas
作者: Durre, Mark; Mould, Jeremy; Schartmann, Marc; Uddin, Syed Ashraf; Cotter, Garrett
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 838, 期号:2, 页码:102-
英文摘要: IC 630 is a nearby early-type galaxy with a mass of 6 x 10(10) M-circle dot with an intense burst of recent (6Myr) star formation (SF). It shows strong nebular emission lines, with radio and X-ray emission, which classifies it as an active galactic nucleus (AGN). With VLT-SINFONI and Gemini North-NIFS adaptive optics observations (plus supplementary ANU 2.3m WiFeS optical IFU observations), the excitation diagnostics of the nebular emission species show no sign of standard AGN engine excitation; the stellar velocity dispersion also indicates that a supermassive black hole (if one is present) is small (M. = 2.25 x 10(5)M(circle dot)). The luminosity at all wavelengths is consistent with SF at a rate of about 1-2M(circle dot) yr(-1). We measure gas outflows driven by SF at a rate of 0.18M(circle dot) yr(-1) in a face-on truncated cone geometry. We also observe a nuclear cluster or disk and other clusters. Photoionization from young, hot stars is the main excitation mechanism for [Fe II] and hydrogen, whereas shocks are responsible for the H-2 excitation. Our observations are broadly comparable with simulations where a Toomre-unstable, self-gravitating gas disk triggers a burst of SF, peaking after about 30 Myr and possibly cycling with a period of about 200 Myr.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17419
Appears in Collections:南极天文中心_期刊论文

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