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Title:
Mid- to Far-Infrared Emission and Star Formation in Early-Type Galaxies
Authors:
Young, Lisa M.; Bendo, George J.; Lucero, Danielle M.
Affiliation:
AA(Physics Department, New Mexico Tech, Socorro, NM 87801, USA ), AB(Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London, W5 2JN, UK), AC(Physics Department, New Mexico Tech, Socorro, NM 87801, USA )
Publication:
The Astronomical Journal, Volume 137, Issue 2, pp. 3053-3070 (2009). (AJ Homepage)
Publication Date:
02/2009
Origin:
IOP
AJ Keywords:
galaxies: elliptical and lenticular, cD, galaxies: individual: UGC 1503 NGC 0807 NGC 2320 NGC 3032 NGC 3656 NGC 4459 NGC 4476 NGC 4526 NGC 5666, galaxies: ISM
DOI:
10.1088/0004-6256/137/2/3053
Bibliographic Code:
2009AJ....137.3053Y

Abstract

Many early-type galaxies have been detected at wavelengths of 24-160 μm but the emission is usually dominated by heating from an active galactic nucleus or from the evolved stellar population. Here, we present Spitzer MIPS observations of a sample of elliptical and lenticular galaxies that are rich in cold molecular gas, and we investigate whether the mid-IR to far-IR (FIR) emission could be associated with star formation activity. The 24 μm images show a rich variety of structures, including nuclear point sources, rings, disks, and smooth extended emission. Comparisons to matched-resolution CO and radio continuum images suggest that the bulk of the 24 μm emission can be traced to star formation with some notable exceptions. The 24 μm luminosities of the CO-rich galaxies are typically a factor of 15 larger than what would be expected from the dust associated with their evolved stars. In addition, FIR/radio flux density ratios are consistent with star formation. We conclude that the star formation rates in z = 0 elliptical and lenticular galaxies, as inferred by other authors from UV and optical data, are roughly consistent with the molecular gas abundances and that the molecular gas is usually unstable to star formation activity.
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