The Herschel Virgo Cluster Survey XIII. Dust in early-type galaxies

• Published in: Astronomy and astrophysics (Berlin) Vol. 552; p. np
• Main Authors: Alighieri, S di Serego, Bianchi, S, Pappalardo, C, Zibetti, S, Auld, R, Baes, M, Bendo, G, Corbelli, E, Davies, J I, Davis, T
• Format: Journal Article
• Language: English
• Published: 01.04.2013
• Subjects: Astronomy; Astrophysics; Clusters; Dust; Emission; Galaxies; Virgo galactic cluster
• ISSN: 0004-6361; 1432-0746
• DOI: 10.1051/0004-6361/201220551

We study the dust content of a large optical input sample of 910 early-type galaxies (ETG) in the Virgo cluster, also extending to the dwarf ETG, and examine the results in relation to those on the other cold ISM components. We have searched for far-infrared emission in all galaxies in the input sample using the 250 mu m image of the Herschel Virgo Cluster Survey (HeViCS). This image covers a large fraction of the cluster with an area of [similar]55 square degrees. Comparing the dust results with those on Hi there are only eight ETG detected both in dust and in Hi in the HeViCS area; 39 have dust but only an upper limit on Hi, and eight have Hi but only an upper limit on dust. The locations of these galaxies in the cluster are different, with the dusty ETG concentrated in the densest regions, while the Hi rich ETG are at the periphery.