Interstellar medium disruption in the Centaurus A group

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dc.creatorBouchard, A.
dc.creatorJerjen, H.
dc.creatorDa Costa, G. S.
dc.creatorOtt, J.
dc.date2006-11-14
dc.date.accessioned2026-07-07T11:20:41Z
dc.date.available2026-07-07T11:20:41Z
dc.descriptionWe present the results of a 21 cm neutral hydrogen (HI) line detection experiment in the direction of 18 low luminosity dwarf galaxies of the Centaurus A group, using the Australia Telescope National Facility 64m Parkes Radio Telescope and the Australia Telescope Compact Array. Five dwarfs have HI masses between M_HI=4x10^5 to M_HI=2.1x10^7 Msol and 0.04<M_HI/L_B<1.81 Msol L_{sol, B}^-1. The other 13 have upper-limits between M_HI<5x10^5 and M_HI<4x10^6 Msol (M_HI}/L_B<0.24 Msol L_{sol, B}^-1). Two of the mixed-morphology dwarfs remain undetected in HI, a situation that is in contrast to that of similar Local Group and Sculptor group objects where all contain significant amounts of neutral gas. There is a discontinuity in the HI properties of Centaurus A group low luminosity dwarfs that is unobserved amongst Sculptor group dwarfs. All objects fainter than M_B=-13 have either M_HI>10^7 Msol or M_HI<10^6 Msol. This gap may be explained by the ram pressure stripping mechanism at work in this dense environment where all galaxies with M_HI<10^7 Msol have been stripped of their gas. The required intergalactic medium density to achieve this is ~10^-3 cm^-3.
dc.description7 figures, 2 tables
dc.identifierhttps://arxiv.org/abs/astro-ph/0611423
dc.identifierhttp://arxiv.org/abs/astro-ph/0611423
dc.identifierAstron.J.133:261-269,2007
dc.identifierdoi:10.1086/509132
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194036
dc.subjectAstrophysics
dc.titleInterstellar medium disruption in the Centaurus A group
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