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Mid-Infrared Enhanced Lenticulars caught in the dusty midst of transformation in the Coma Cluster

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Laurie Riguccini ,
Pasquale Temi ,
Alexandre Amblard  and
Michael Fanelli
Laurie Riguccini
Affiliation:
Observatório do Valongo, UFRJ, Ladeira do Pedro Antônio 43, Saúde, Rio de Janeiro, RJ 20080-090, Brazil ([email protected]) CAPES/BJT Science Without Borders Postdoctoral Fellow, Brazil
Pasquale Temi
Affiliation:
NASA Ames Research Center, Moffett Field, CA, United States.
Alexandre Amblard
Affiliation:
NASA Ames Research Center, Moffett Field, CA, United States.
Michael Fanelli
Affiliation:
NASA Ames Research Center, Moffett Field, CA, United States.
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Abstract

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We explore the properties of early-type galaxies (ETGs) in rich environments such as clusters of galaxies. The L24/LK distribution of ETGs in both Virgo and Coma clusters shows that some lenticulars (S0, 10 in Coma and 3 in Virgo) have a much larger L24/LK ratio (0.5 to ~2 dex) than the bulk of the ETG population. We call these sources Mid-Infrared Enhanced Galaxies (MIEGs). In Coma, they are mostly located in the South-West part of the cluster where a substructure is falling onto the main cluster. MIEGs present lower g-r color than the rest of the ETGs, because of a blue continuum. We interpret the excess L24/LK ratio as evidence for an enhanced star-formation induced as a consequence of their infall into the main cluster.

Keywords

galaxies: elliptical and lenticularcDgalaxies: clusters: individual (Virgo, Coma)
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E69
Copyright
Copyright © International Astronomical Union 2016 

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