Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530204t&link_type=abstract
American Astronomical Society, AAS Meeting #215, #302.04; Bulletin of the American Astronomical Society, Vol. 42, p.299
Mathematics
Logic
Scientific paper
We study the environmentally-driven evolution of galaxies using a combination of cosmological and idealized simulations at high resolution. It is well known that spiral galaxies dominate the population of field galaxies, and early type galaxies dominate the cluster population. There are a number of environmental mechanisms at work in clusters, including galaxy-galaxy, galaxy-cluster, and galaxy-intracluster medium (ICM) interactions. To study whether and how galaxies evolve in a dense environment, we first examined a cluster in a cosmological simulation. We found that ram pressure stripping was the most frequent and most effective mechanism for gas loss, an important part of morphological evolution, at a large range of cluster radii.
This raised the question of how ram pressure can be an effective stripping mechanism in the low density environment at large cluster radii. By examining the ICM, we discovered that variations in ram pressure are driven equally by substructure in ICM density and variations in the ICM-galaxy velocity.
We have also run a set of high resolution (40 pc) galaxy simulations to investigate how ram pressure affects a galaxy with a multiphase ISM, and whether this interaction can be recognized by characteristics of the resulting tail of gas. We find that gas at large galactic radii is stripped and that dense clouds anywhere in the disk can be slowly stripped and destroyed by the wind. The resulting gas tails can survive for hundreds of megayears (and kpc) and be observable in HI, Hα, and X-ray emission (depending on the ICM conditions).
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