Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291..314d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 291, Issue 2, pp. 314-320.
Astronomy and Astrophysics
Astronomy
4
Ism: Molecules, Galaxies: Individual: Ngc 4536, Galaxies: Starburst, Infrared: Galaxies, Infrared: Ism: Lines And Bands
Scientific paper
We present near-infrared images of the 2-μm continuum and H_2 nu=1-0 S(1) 2.12-μm line emission from the starburst galaxy NGC 4536. The morphologies show striking differences: the continuum is strongly peaked at the nucleus, while the molecular hydrogen clearly shows subsidiary peaks. These coincide with emission peaks observed in the radio and 10.8-μm continuum, supporting the hypothesis of an edge-on ring experiencing star formation. Consideration of the possible excitation mechanisms of the 1-0 S(1) line has led us to conclude that both supernovae and OB stars are important. Shocks in cloud collisions may also contribute to the extended H_2 regions. We postulate that the star formation at the nucleus has come to an end, so that supernovae now dominate the emission, while in the ring star formation is still active and OB stars make a significant contribution. The implications of this are that if the nuclear star formation has occurred first, it must also be fuelled first. We show that this is possible by considering bar-induced gas infall: when the bar first forms, gas is channelled in towards the centre; however, when the nuclear mass has built up sufficiently, inner Lindblad resonances form and the inflow will cease in the circumnuclear regions. Thus star formation in the ring is fuelled at a later time than in the nucleus.
Davies Richard I.
Sugai Hajime
Ward Martin J.
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