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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3283
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dc.contributor.authorAngiras, R.A.-
dc.contributor.authorJog, C.J.-
dc.contributor.authorDwarakanath, K.S.-
dc.contributor.authorVerheijen, M.A.W.-
dc.date.accessioned2007-07-24T05:45:00Z-
dc.date.available2007-07-24T05:45:00Z-
dc.date.issued2007-06-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2007, Vol.378, p276-284en
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/2289/3283-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractWe have carried out the harmonic analysis of the atomic hydrogen (HI) surface density maps and the velocity fields for 11 galaxies belonging to the Ursa Major group, over a radial range of 4-6 disc scalelengths in each galaxy. This analysis gives the radial variation of spatial lopsidedness, quantified by the Fourier amplitude A1 of the m = 1 component normalized to the average value. The kinematical analysis gives a value for the elongation of the potential to be ~10 per cent. The mean amplitude of spatial lopsidedness is found to be ~0.14 in the inner disc, similar to the field galaxies, and is smaller by a factor of ~2 compared to the Eridanus group galaxies. It is also shown that the average value of A1 does not increase with the Hubble type, contrary to what is seen in field galaxies. We argue that the physical origin of lopsidedness in the Ursa Major group of galaxies is tidal interactions, albeit weaker and less frequent than in Eridanus. Thus systematic studies of lopsidedness in groups of galaxies can provide dynamical clues regarding the interactions and evolution of galaxies in a group environment.en
dc.format.extent382729 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherBlackwell Publishing for the Royal Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/cgi-bin/bib_query?2007MNRAS.378..276Aen
dc.relation.urihttp://arxiv.org/abs/astro-ph/0703709en
dc.relation.urihttp://dx.doi.org/10.1111/j.1365-2966.2007.11779.xen
dc.rights2007 Royal Astronomical Societyen
dc.subjectgalaxies: evolutionen
dc.subjectgalaxies: ISMen
dc.subjectgalaxies: kinematics and dynamicsen
dc.subjectgalaxies: spiralen
dc.subjectgalaxies: structureen
dc.titleSpatial and kinematical lopsidedness of atomic hydrogen in the Ursa Major group of galaxiesen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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