Interstellar Medium Disruption in the Centaurus A Group | Zendy

Antoine Bouchard | Zendy; Helmut Jerjen | Zendy; G. S. Da Costa | Zendy; J. Ott | Zendy

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Interstellar Medium Disruption in the Centaurus A Group

Author(s) -

Antoine Bouchard,

Helmut Jerjen,

G. S. Da Costa,

J. Ott

Publication year - 2006

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/509132

Subject(s) - centaurus a , physics , astrophysics , galaxy , luminosity , telescope , hydrogen line , local group , dwarf galaxy , interstellar medium , intergalactic travel , astronomy , radio telescope , radio galaxy , redshift

We present the results of a 21 cm neutral hydrogen (HI) line detectionexperiment in the direction of 18 low luminosity dwarf galaxies of theCentaurus A group, using the Australia Telescope National Facility 64m ParkesRadio Telescope and the Australia Telescope Compact Array. Five dwarfs have HImasses between M_HI=4x10^5 to M_HI=2.1x10^7 Msol and 0.0410^7 Msol or M_HI<10^6 Msol. This gap may be explained by the ram pressurestripping mechanism at work in this dense environment where all galaxies withM_HI<10^7 Msol have been stripped of their gas. The required intergalacticmedium density to achieve this is ~10^-3 cm^-3.Comment: 7 figures, 2 table

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