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Galaxy And Mass Assembly (GAMA): Gas Fuelling of Spiral Galaxies in the Local Universe I. - The Effect of the Group Environment on Star Formation in Spiral Galaxies

Grootes, MW and Tuffs, RJ and Popescu, CC and Norberg, P and Robotham, ASG and Liske, J and Andrae, E and Baldry, IK and Gunawardhana, M and Kelvin, LS and Madore, BF and Seibert, M and Taylor, EN and Alpaslan, M and Brown, MJI and Cluver, ME and Driver, SP and Bland-Hawthorn, J and Holwerda, BW and Hopkins, AM and Lopez-Sanchez, AR and Loveday, J and Rushton, M (2017) Galaxy And Mass Assembly (GAMA): Gas Fuelling of Spiral Galaxies in the Local Universe I. - The Effect of the Group Environment on Star Formation in Spiral Galaxies. The Astronomical Journal, 153 (3). ISSN 0004-6256

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Abridged - We quantify the effect of the galaxy group environment (for 12.5 < log(M_group/Msun) < 14.0) on the star formation rates of the (morphologically-selected) population of disk-dominated local Universe spiral galaxies (z < 0.13) with stellar masses log(M*/Msun) > 9.5. Within this population, we find that, while a small minority of group satellites are strongly quenched, the group centrals, and the large majority of satellites exhibit levels of SFR indistinguishable from ungrouped "field" galaxies of the same M*, albeit with a higher scatter, and for all M*. Modelling these results, we deduce that disk-dominated satellites continue to be characterized by a rapid cycling of gas into and out of their ISM at rates similar to those operating prior to infall, with the on-going fuelling likely sourced from the group intrahalo medium (IHM) on Mpc scales, rather than from the circum-galactic medium on 100kpc scales. Consequently, the color-density relation of the galaxy population as a whole would appear to be primarily due to a change in the mix of disk- and spheroid-dominated morphologies in the denser group environment compared to the field, rather than to a reduced propensity of the IHM in higher mass structures to cool and accrete onto galaxies. We also suggest that the inferred substantial accretion of IHM gas by satellite disk-dominated galaxies will lead to a progressive reduction in their specific angular momentum, thereby representing an efficient secular mechanism to transform morphology from star-forming disk-dominated types to more passive spheroid-dominated types.

Item Type: Article
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA; astro-ph.CO
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society IOP Publishing
Related URLs:
Date Deposited: 12 Jan 2017 12:00
Last Modified: 06 Sep 2017 21:20
DOI or Identification number: 10.3847/1538-3881/153/3/111
URI: http://researchonline.ljmu.ac.uk/id/eprint/5249

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