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IC 630: Piercing the Veil of the Nuclear Gas
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Paper
IC 630: Piercing the Veil of the Nuclear Gas
2017
Overview
IC 630 is a nearby early-type galaxy with a mass of \\(6 \\times 10^{10} M_{\\odot}\\) with an intense burst of recent (6 Myr) star formation. It shows strong nebular emission lines, with radio and X-ray emission, which classifies it as an 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 indicate that a super-massive black hole (if one is present) is small (\\(M_{\\bullet} = 2.25 \\times 10^{5}~M_{\\odot}\\)). The luminosity at all wavelengths is consistent with star formation at a rate of about \\(1-2 M_{\\odot}\\)/yr. We measure gas outflows driven by star formation at a rate of \\(0.18 M_{\\odot}\\)/yr in a face-on truncated cone geometry. We also observe a nuclear cluster or disk and other clusters. Photo-ionization 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 star formation, peaking after about 30 Myr and possibly cycling with a period of about 200 Myr.
Publisher
Cornell University Library, arXiv.org
Subject
