2017ApJ...838..102D -
Astrophys. J., 838, 102-102 (2017/April-1)
IC 630: piercing the veil of the nuclear gas.
DURRE M., MOULD J., SCHARTMANN M., UDDIN S.A. and COTTER G.
Abstract (from CDS):
IC 630 is a nearby early-type galaxy with a mass of 6×1010M☉ with an intense burst of recent (6 Myr) 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 2.3 m 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•=2.25×105 M☉). The luminosity at all wavelengths is consistent with SF at a rate of about 1-2 M☉ yr–1. We measure gas outflows driven by SF at a rate of 0.18 M☉ 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 H2 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.
Abstract Copyright:
© 2017. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: active - galaxies: individual: IC 630 - galaxies: ISM - galaxies: nuclei - galaxies: starburst - galaxies: star formation - galaxies: star formation
Simbad objects:
16
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