THE VIRUS-P EXPLORATION OF NEARBY GALAXIES (VENGA): RADIAL GAS INFLOW AND SHOCK EXCITATION IN NGC 1042

ABSTRACT NGC 1042 is a late-type bulgeless disk galaxy that hosts low-luminosity active galactic nuclei (AGNs) coincident with a massive nuclear star cluster. In this paper, we present the integral field spectroscopy studies of this galaxy, based on the data obtained with the Mitchell spectrograph o...

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Bibliographic Details
Published in:	The Astrophysical journal 2016-06, Vol.823 (2), p.85-85
Main Authors:	Luo(罗荣欣), Rongxin, Hao, Lei, Blanc, Guillermo A., Jogee, Shardha, Bosch, Remco C. E. van den, Weinzirl, Tim
Format:	Article
Language:	eng
Subjects:	Active galactic nuclei Disk galaxies Exploration Galaxies galaxies: active galaxies: individual (NGC 1042) galaxies: ISM galaxies: kinematics and dynamics galaxies: nuclei Inflow Integral field spectroscopy ISM: kinematics and dynamics Star clusters Star formation
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Summary:	ABSTRACT NGC 1042 is a late-type bulgeless disk galaxy that hosts low-luminosity active galactic nuclei (AGNs) coincident with a massive nuclear star cluster. In this paper, we present the integral field spectroscopy studies of this galaxy, based on the data obtained with the Mitchell spectrograph on the 2.7 m Harlan J. Smith telescope. In the central 100-300 pc region of NGC 1042, we find a circumnuclear ring structure of gas with enhanced ionization, which we suggest is mainly induced by shocks. Combining this with the harmonic decomposition analysis of the velocity field of the ionized gas, we propose that the shocked gas is the result of gas inflow driven by the inner spiral arms. The inflow velocity is , and the estimated mass-inflow rate is . The mass-inflow rate is about one hundred times the black hole's mass-accretion rate ( ) and slightly larger than the star-formation rate in the nuclear star cluster ( ), implying that the inflow material is enough to feed both the AGN activity and star formation in the nuclear star cluster. Our study highlights that secular evolution can be important in late-type unbarred galaxies like NGC 1042.
ISSN:	0004-637X 1538-4357