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Grootes, MW, Tuffs, RJ, Popescu, CC, Norberg, P, Robotham, ASG, Liske, J, Andrae, E, Baldry, IK, Gunawardhana, M, Kelvin, LS, Madore, BF, Seibert, M, Taylor, EN, Alpaslan, M, Brown, MJI, Cluver, ME, Driver, SP, Bland-Hawthorn, J, Holwerda, BW, Hopkins, AM , Lopez-Sanchez, AR, 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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Abstract
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 |
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| 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: | 04 Sep 2021 12:06 |
| DOI or ID number: | 10.3847/1538-3881/153/3/111 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/5249 |
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