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03 October 2022
  » arxiv » astro-ph/0310709

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The origin of HI-deficiency in galaxies on the outskirts of the Virgo cluster. I. How far can galaxies bounce out of clusters?
G. A. Mamon ; T. Sanchis ; E. Salvador-Sole’ & J. M. Solanes . ;
Date 24 Oct 2003
Journal Astron.Astrophys. 414 (2004) 445-451 DOI: 10.1051/0004-6361:20034155
Subject astro-ph
Affiliation1,2), T. Sanchis , E. Salvador-Sole’ (3,4) & J. M. Solanes (3,4). ( IAP, Paris; GEPI, Obs. de Paris-Meudon; Dep. de Astronomia i Meteorologia, Univ. de Barcelona; CER on Astrophys., Particle Phys. & Cosmology, Univ. de Barcelona
AbstractSpiral galaxies that are deficient in neutral Hydrogen are observed on the outskirts of the Virgo cluster. If their orbits have crossed the inner parts of the cluster, their interstellar gas may have been lost through ram pressure stripping by the hot X-ray emitting gas of the cluster. We estimate the maximum radius out to which galaxies can bounce out of a virialized system using analytical arguments and cosmological N-body simulations. In particular, we derive an expression for the turnaround radius in a flat cosmology with a cosmological constant that is simpler than previously derived expressions. We find that the maximum radius reached by infalling galaxies as they bounce out of their cluster is roughly between 1 and 2.5 virial radii. Comparing to the virial radius of the Virgo cluster, which we estimate from X-ray observations, these HI-deficient galaxies appear to lie significantly further away from the cluster center. Therefore, if their distances to the cluster core are correct, the HI-deficient spiral galaxies found outside of the Virgo cluster cannot have lost their gas by ram pressure from the hot intracluster gas.
Source arXiv, astro-ph/0310709
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