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Title:
Early Type Galaxies in the Mid Infrared
Authors:
Bressan, A.; Panuzzo, P.; Silva, L.; Buson, L.; Clemens, M.; Granato, G. L.; Rampazzo, R.; Valdes, J. R.; Vega, O.
Publication:
From Stars to Galaxies: Building the Pieces to Build Up the Universe. ASP Conference Series, Vol. 374, proceedings of the conference held 16-20 October 2006 at Istituto Veneto di Scienze, Lettere ed Arti, Venice, Italy. Edited by Antonella Vallenari, Rosaria Tantalo, Laura Portinari, and Alessia Moretti., p.333
Publication Date:
12/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..374..333B

Abstract

We are performing a systematic study of the properties of early-type galaxies in the mid infrared spectral region with the Spitzer Space Telescope. We present here high S/N Spitzer IRS spectra of 17 Virgo early-type galaxies. Thirteen objects of the sample (76%) show a pronounced broad feature (above 10μm) which is spatially extended and likely of stellar origin. We argue that this feature is (mostly) due to silicate emission from circumstellar envelopes of asymptotic giant branch (AGB) stars. The remaining 4 objects, namely NGC 4486, NGC 4636, NGC 4550 and NGC 4435, are characterized by different levels and type of activity.
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