Modelling the bar in the centre of the starburst galaxy M82

Details Modelling the bar in the centre of the starburst galaxy M82 Modelling the bar in the centre of the starburst galaxy M82

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.316...33w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 316, Issue 1, pp. 33-48.

Astronomy and Astrophysics

Astronomy

35

Galaxies: Individual: M82, Galaxies: Kinematics And Dynamics, Galaxies: Starburst

Scientific paper

We 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.

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