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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1337

Title: Kinematics of molecular gas in the nucleus of barred galaxies: NGC 253 and M82
Authors: Das, Mousumi
Keywords: Galaxies
Individual (NGC 253, M82)
Kinematics and dynamics
Issue Date: 2000
Publisher: The Astronomical Society of India
Citation: Bulletin of the Astronomical Society of India, 2000, Vol.28, p357-361
Abstract: In more than half of all observed spiral galaxies, the central molecular gas is distributed in a bar. Since gas is a dissipative fluid, it will tend to settle along closed orbits in the plane of a galaxy. Simulations of bar orbits have shown that there are mainly two types of closed orbits in a bar potential the x1 orbits lying along the length of the bar and the x2 orbits lying perpendicular to the length of the bar. We have used a simple form of a bar potential to model the bar in two nearby starburst galaxies, NGC 253 and M82. Using parameters taken from the observed rotation curves, we have constructed the position velocity diagram and velocity contour plot for the bar in these galaxies. These plots help us understand the observed distribution and velocity field of the gas in these galaxies. We find that in NGC 253, the nuclear star formation is concentrated mainly along the x2 orbits and the nuclear velocity field shows signs of a past merger event in the galaxy. In M82, we find that the supernova remnants and HI gas lies along the x1 orbits whereas the ionized gas is mainly along the inner x2 orbits.
URI: http://hdl.handle.net/2289/1337
ISSN: 0304-9523
Alternative Location: http://adsabs.harvard.edu/cgi-bin/nph-bib_query?2000BASI...28..357D
Copyright: (2000) by the Astronomical Society of India. Scanned images provided by the NASA ADS Data System.
Appears in Collections:Research Papers (A&A)

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