A mid-IR study of Hickson Compact Groups I : Probing the Effects of Environment in Galaxy Interactions

Details A mid-IR study of Hickson Compact Groups I : Probing the Effects of Environment in Galaxy Interactions A mid-IR study of Hickson Compact Groups I : Probing the Effects of Environment in Galaxy Interactions

2010-03-08

arxiv.org/abs/1003.1644v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

24 pages, 9 figures, published in A&A

Scientific paper

Hickson Compact Groups (HCGs) are among the densest galaxy environments of the local universe. To examine the effects of the environment on the infrared properties of these systems, we present an analysis of Spitzer and ISO mid-infrared imaging as well as deep ground based near-infrared imaging of 14 HCGs containing a total of 69 galaxies. Based on mid-infrared color diagnostics we identify the galaxies which appear to host an active nucleus, while using a suite of templates, we fit the complete infrared spectral energy distribution for each group member. We compare our estimates of galaxy mass, star formation rate, total infrared luminosities, and specific star formation rates (sSFR) for our HCG sample, to samples of isolated galaxies and interacting pairs and find that overall there is no discernible difference among them. However, HCGs which can be considered as dynamically "old", host late-type galaxies with a slightly lower sSFR than the one found in dynamically "young" groups. This could be attributed to multiple past interactions among the galaxies in old groups, that have led to the build up of their stellar mass. It is also consistent with our prediction for the presence of diffuse cold dust in the intergalactic medium of 9 of the dynamically "old" groups.

Affiliated with

Also associated with

No associations

Rating

A mid-IR study of Hickson Compact Groups I : Probing the Effects of Environment in Galaxy Interactions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A mid-IR study of Hickson Compact Groups I : Probing the Effects of Environment in Galaxy Interactions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A mid-IR study of Hickson Compact Groups I : Probing the Effects of Environment in Galaxy Interactions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-677325