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Title:
a Dark Galaxy in the Virgo Cluster Imaged at 21-CM
Authors:
Minchin, R.; Disney, M. J.; Davies, J. I.; Marble, A. R.; Impey, C. D.; Boyce, P. J.; Garcia, D. A.; Grossi, M.; Jordan, C. A.; Lang, R. H.; Roberts, S.; Sabatini, S.; van Driel, W.
Affiliation:
AA(Arecibo Observatory; School of Physics and Astronomy, Cardiff University), AB(School of Physics and Astronomy, Cardiff University), AC(School of Physics and Astronomy, Cardiff University), AD(Steward Observatory, University of Arizona), AE(Steward Observatory, University of Arizona), AF(School of Physics and Astronomy, Cardiff University), AG(School of Physics and Astronomy, Cardiff University), AH(School of Physics and Astronomy, Cardiff University), AI(Jodrell Bank Observatory, University of Manchester), AJ(School of Physics and Astronomy, Cardiff University), AK(School of Physics and Astronomy, Cardiff University), AL(Osservatorio Astronomico di Roma), AM(Observatoire de Paris)
Publication:
ISLAND UNIVERSES, Astrophysics and Space Science Proceedings. ISBN 978-1-4020-5572-0. Springer, 2007, p. 101
Publication Date:
00/2007
Origin:
SPRINGER
Bibliographic Code:
2007iuse.book..101M

Abstract

Dark Matter supposedly dominates the extragalactic Universe (Peebles 1993; Peacock 1998; Moore et al. 1999; D'Onghi & Lake 2004), yet no dark structure of galactic proportions has ever been convincingly identified. Earlier (Minchin et al. 2005) we suggested that VIRGOHI 21, a 21-cm source we found in the Virgo Cluster at Jodrell Bank using single-dish observations (Davies et al. 2004), was probably such a dark galaxy because of its broad line-width (~200 km s-1) unaccompanied by any visible gravitational source to account for it. We have now imaged VIRGOHI 21 in the neutral-hydrogen line, and have found what appears to be a dark, edge-on, spinning disc with the mass and diameter of a typical spiral galaxy. Moreover the disc has unquestionably interacted with NGC 4254, a luminous spiral with an odd one-armed morphology, but lacking the massive interactor normally linked with such a feature. Published numerical models (Vollmer et al. 2005) of NGC 4254 call for a close interaction ~108 years ago with a perturber of ~1011 solar masses. This we take as further, independent evidence for the massive nature of VIRGOHI 21.
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