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

N.K. Agius, S. Di Serego Alighieri, S. Viaene, M. Baes, A.E. Sansom, N. Bourne, J. Bland-Hawthorn, S. Brough, T.A. Davis, I. De Looze, Simon Driver, L. Dunne, S. Dye, S.A. Eales, T.M. Hughes, R.J. Ivison, L.S. Kelvin, S. Maddox, S. Mahajan, C. PappalardoAaron Robotham, K. Rowlands, P. Temi, E. Valiante

Research output: Contribution to journalArticle

13 Citations (Scopus)
152 Downloads (Pure)

Abstract

© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. 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.
Original languageEnglish
Pages (from-to)3815-3835
JournalMonthly Notices of the Royal Astronomical Society
Volume451
Issue number4
Early online date29 Jun 2015
DOIs
Publication statusPublished - 21 Aug 2015

Fingerprint Dive into the research topics of 'H-ATLAS/GAMA and HeViCS -dusty early-type galaxies in different environments'. Together they form a unique fingerprint.

  • Projects

    Cite this

    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., Dunne, L., Dye, S., Eales, S. A., Hughes, T. M., Ivison, R. J., Kelvin, L. S., Maddox, S., Mahajan, S., ... 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. https://doi.org/10.1093/mnras/stv1191