AAS 207th Meeting, 8-12 January 2006
Session 172 Supernovae Remnants
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

Previous   |   Session 172   |   Next  |   Author Index   |   Block Schedule

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

C. K. Lacey (U. of South Carolina), W.M. Goss (NRAO), L. K. Mizouni (U. of South Carolina)

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.

Previous   |   Session 172   |   Next

Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.