H-ATLAS/GAMA and HeViCS - dusty early-type galaxies in different environments

Agius, N. K., di Serego Alighieri, S., Viaene, S., Baes, M., Sansom, A. E., Bourne, N., Bland-Hawthorn, J., Brough, S., Davis, Timothy ORCID: https://orcid.org/0000-0003-4932-9379, De Looze, I., Driver, S. P., Dunne, Loretta ORCID: https://orcid.org/0000-0001-9880-2543, Dye, S., Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X, Hughes, T. M., Ivison, R. J., Kelvin, L. S., Maddox, Steve ORCID: https://orcid.org/0000-0001-5549-195X, Mahajan, S., Pappalardo, C., Robotham, A. S. G., Rowlands, K., Temi, P. and Valiante, Elisabetta 2015. H-ATLAS/GAMA and HeViCS - dusty early-type galaxies in different environments. Monthly Notices of the Royal Astronomical Society 451 (4) , pp. 3815-3835. 10.1093/mnras/stv1191

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Abstract

The Herschel Space Observatory has had a tremendous impact on the study of extragalactic dust. Specifically, early-type galaxies (ETG) have been the focus of several studies. In this paper, we combine results from two Herschel studies – a Virgo cluster study Herschel Virgo Cluster Survey (HeViCS) and a broader, low-redshift Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS)/Galaxy and Mass Assembly (GAMA) study – and contrast the dust and associated properties for similar mass galaxies. This comparison is motivated by differences in results exhibited between multiple Herschel studies of ETG. A comparison between consistent modified blackbody derived dust mass is carried out, revealing strong differences between the two samples in both dust mass and dust-to-stellar mass ratio. In particular, the HeViCS sample lacks massive ETG with as high a specific dust content as found in H-ATLAS. This is most likely connected with the difference in environment for the two samples. We calculate nearest neighbour environment densities in a consistent way, showing that H-ATLAS ETG occupy sparser regions of the local Universe, whereas HeViCS ETG occupy dense regions. This is also true for ETG that are not Herschel-detected but are in the Virgo and GAMA parent samples. Spectral energy distributions are fit to the panchromatic data. From these, we find that in H-ATLAS the specific star formation rate anticorrelates with stellar mass and reaches values as high as in our Galaxy. On the other hand HeViCS ETG appear to have little star formation. Based on the trends found here, H-ATLAS ETG are thought to have more extended star formation histories and a younger stellar population than HeViCS ETG.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Oxford University Press
ISSN:	0035-8711
Date of Acceptance:	22 May 2015
Last Modified:	28 Oct 2022 10:17
URI:	https://orca.cardiff.ac.uk/id/eprint/77739

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