Setting the normalcy level of HI properties in isolated galaxies

Details Setting the normalcy level of HI properties in isolated galaxies Setting the normalcy level of HI properties in isolated galaxies

2009-09-15

arxiv.org/abs/0909.2736v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 2 figures, Conference 'Galaxies in Isolation: Exploring Nature vs. Nurture', Granada, 12-15 May 2009. To be published

Scientific paper

Studying the atomic gas (HI) properties of the most isolated galaxies is essential to quantify the effect that the environment exerts on this sensitive component of the interstellar medium. We observed and compiled HI data for a well defined sample of ~ 800 galaxies in the Catalog of Isolated Galaxies, as part of the AMIGA project (Analysis of the ISM in Isolated GAlaxies, http://amiga.iaa.es), which enlarges considerably previous samples used to quantify the HI deficiency in galaxies located in denser environments. By studying the shape of 182 HI profiles, we revisited the usually accepted result that, independently of the environment, more than half of the galaxies present a perturbed HI disk. In isolated galaxies this would certainly be a striking result if these are supposed to be the most relaxed systems, and has implications in the relaxation time scales of HI disks and the nature of the most frequent perturbing mechanisms in galaxies. Our sample likely exhibits the lowest HI asymmetry level in the local Universe. We found that other field samples present an excess of ~ 20% more asymmetric HI profiles than that in CIG. Still a small percentage of galaxies in our sample present large asymmetries. Follow-up high resolution VLA maps give insight into the origin of such asymmetries.

Affiliated with

Also associated with

No associations

Rating

Setting the normalcy level of HI properties in isolated galaxies 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 Setting the normalcy level of HI properties in isolated galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Setting the normalcy level of HI properties in isolated galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-555560