Astronomy and Astrophysics – Astronomy
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.359..827r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 359, Issue 3, pp. 827-834.
Astronomy and Astrophysics
Astronomy
21
Supernovae: General, Galaxies: Active, Galaxies: Individual: Arp 220, Galaxies: Starburst, Radio Continuum: Galaxies
Scientific paper
We present multi-epoch observations of Arp 220 with the VLBA and focus on the continuum emission from the luminous radio supernovae (RSNe) whose 1.6-GHz light curves are shown. The supernovae seem to be generally stable or only slowly decaying in flux with time, a result which deviates from the model of Type IIn RSNe. Hints of new eruptions confirm that they are indeed new sources and not supernova remnants, which could be several hundred years old. The slow decay of the sources for which monitoring data were available forces us to reconsider the starburst model for Arp 220 and adopt a more modest value of 0.7yr-1 for the supernova rate based on these new eruptions. The starburst efficiency should also be modified accordingly which gives rise to the issue of an active nucleus once more. The question is raised whether it is the starburst which creates this active nucleus, something which could affect the evolution of starburst galaxies as a group.
Diamond Phil J.
Lonsdale Colin J.
Rovilos Emmanouel
Smith Harding E.
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