VLA Observations of the Luminous Supernova Remnant, J1228+441, in NGC 4449

Details VLA Observations of the Luminous Supernova Remnant, J1228+441, in NGC 4449 VLA Observations of the Luminous Supernova Remnant, J1228+441, in NGC 4449

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717217l&link_type=abstract

American Astronomical Society Meeting 207, #172.17; Bulletin of the American Astronomical Society, Vol. 37, p.1438

Astronomy and Astrophysics

Astronomy

Scientific paper

The luminous supernova remnant (SNR) J1228+441 is the brightest radio source in the irregular galaxy NGC 4449. J1228+441 has an age of less than 200 years based on previous optical and UV observations making J1228+441 one of the few known intermediate-age SNRs and a link between the young (age < 30 years) extragalactic SNe and the older SNRs found in the Milky Way. We present current VLA observations combined with VLA archive and previously published observations that reveal a definite decline in the radio emission at 1.4 and 5.8 GHz over a period of almost 30 years. We discuss the light curve of J1228+441 and present analysis and fitting of the light curve including the decline rate of the radio emission.

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