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Early Type Galaxies in the Mid Infrared: a new flavor to their stellar populations†

Published online by Cambridge University Press:  01 December 2006

A. Bressan ,
P. Panuzzo ,
O. Vega ,
L. Buson ,
M. Clemens ,
G.L. Granato ,
R. Rampazzo ,
L. Silva  and
J.R. Valdes
A. Bressan
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy email: alessandro.bressan@oapd.inaf.it SISSA, via Beirut 4, 34014, Trieste, Italy INAOE, Luis Enrique Erro 1, 72840, Tonantzintla, Puebla, Mexico
P. Panuzzo
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy email: alessandro.bressan@oapd.inaf.it
O. Vega
Affiliation:
INAOE, Luis Enrique Erro 1, 72840, Tonantzintla, Puebla, Mexico
L. Buson
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy email: alessandro.bressan@oapd.inaf.it
M. Clemens
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy email: alessandro.bressan@oapd.inaf.it
G.L. Granato
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy email: alessandro.bressan@oapd.inaf.it SISSA, via Beirut 4, 34014, Trieste, Italy
R. Rampazzo
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy email: alessandro.bressan@oapd.inaf.it
L. Silva
Affiliation:
INAF Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34131 Trieste, Italy
J.R. Valdes
Affiliation:
INAOE, Luis Enrique Erro 1, 72840, Tonantzintla, Puebla, Mexico
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Abstract

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The mid infrared emission of early type galaxies traces the presence of intermediate age stellar populations as well as even tiny amounts of ongoing star formation. Here we discuss high S/N Spitzer IRS spectra of a sample of Virgo early type galaxies, with particular reference to NGC 4435. We show that, by combining mid infrared spectroscopic observations with existing broad band fluxes, it is possible to obtain a very clean picture of the nuclear activity in this galaxy.

Keywords

galaxies: elliptical and lenticularcDgalaxies: ISMinfrared: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 395 - 398
Copyright
Copyright © International Astronomical Union 2007

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