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, T. A., De Looze, I., Driver, S. P., Dunne, L., Dye, S., Eales, S. A., Hughes, T. M., Ivison, R. J., Kelvin, L. S., Maddox, S., Mahajan, S., Pappalardo, C., Robotham, A. S. G., Rowlands, K., Temi, P. and Valiante, E. (2015) H-ATLAS/GAMA and HeViCS -dusty early-type galaxies in different environments. Monthly Notices of the Royal Astronomical Society, 451 4: 3815-3835. doi:10.1093/mnras/stv1191


Author Agius, N. K.
di Serego Alighieri, S.
Viaene, S.
Baes, M.
Sansom, A. E.
Bourne, N.
Bland-Hawthorn, J.
Brough, S.
Davis, T. A.
De Looze, I.
Driver, S. P.
Dunne, L.
Dye, S.
Eales, S. A.
Hughes, T. M.
Ivison, R. J.
Kelvin, L. S.
Maddox, S.
Mahajan, S.
Pappalardo, C.
Robotham, A. S. G.
Rowlands, K.
Temi, P.
Valiante, E.
Title H-ATLAS/GAMA and HeViCS -dusty early-type galaxies in different environments
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 1365-2966
0035-8711
Publication date 2015-08-21
Year available 2015
Sub-type Article (original research)
DOI 10.1093/mnras/stv1191
Open Access Status Not Open Access
Volume 451
Issue 4
Start page 3815
End page 3835
Total pages 21
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2016
Language eng
Formatted 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.
Keyword Methods: statistical
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Submillimetre: galaxies
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
 
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