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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2227
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dc.contributor.authorWills, K.A.-
dc.contributor.authorDas, Mousumi-
dc.contributor.authorPedlar, A.-
dc.contributor.authorMuxlow, T.W.B.-
dc.contributor.authorRobinson, T.G.-
dc.date.accessioned2007-04-03T10:35:13Z-
dc.date.available2007-04-03T10:35:13Z-
dc.date.issued2000-07-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2000, Vol.316, p33-48.en
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/2289/2227-
dc.descriptionRestricted Access. An open access version is available at NASA ADS (alternative location).en
dc.description.abstractWe present VLA A-array 21-cm atomic hydrogen (Hi) absorption observed against the central region of the starburst galaxy M82 with an angular resolution of ~1.3arcsec (~=20pc). These observations, together with MERLIN Hi absorption measurements, are compared with the molecular (CO) and ionized ([Neii]) gas distributions and are used to constrain the dynamics and structure of the ionized, neutral and molecular gas in this starburst. A position-velocity diagram of the Hi distribution reveals an unusual `hole' feature which, when previously observed in CO, has been interpreted as an expanding superbubble contained within a ring of gas in solid body rotation. However, we interpret this feature as a signature of a nearly edge-on barred galaxy. In addition, we note that the CO, Hi and [Neii] position-velocity diagrams reveal two main velocity gradients, and we interpret these as gas moving on x1- and x2-orbits within a bar potential. We find the best fit to the data to be produced using a bar potential with a flat rotation curve velocity vb=140kms-1 and a total length of 1kpc, a non-axisymmetry parameter q=0.9, an angular velocity of the bar Ωb=217kms-1arcsec-1, a core radius Rc=25pc, an inclination angle i=80° and a projected angle between the bar and the major axis of the galaxy φ'=4°. We also discuss the orientation of the disc and bar in M82.en
dc.format.extent8338 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?2000MNRAS.316...33Wen
dc.relation.urihttp://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000MNRAS.316...33W&link_type=ARTICLE&db_key=ASTen
dc.rights(2000) Blackwell Publishing for the Royal Astronomical Societyen
dc.subjectGALAXIES: INDIVIDUAL: M82en
dc.subjectGALAXIES: KINEMATICS AND DYNAMICSen
dc.subjectGALAXIES: STARBURSTen
dc.titleModelling the bar in the centre of the starburst galaxy M82en
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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