Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005seraj.170..101v&link_type=abstract
Serbian Astronomical Journal, Vol. 170, p. 101-110 (http://saj.matf.bg.ac.yu/)
Other
3
Galaxies: Individual (Ngc 4214, Ngc 4395), Galaxies: Ism, Galaxies: Spiral, Galaxies: Starburst, Radio Continuum: Galaxies, Ism: Supernova Remnants
Scientific paper
We present the results of a search for new candidate radio supernova remnants (SNRs) in the nearby starburst irregular galaxies NGC 4214 and NGC 4395 using archived radio observations made with the Very Large Array (VLA) at the wavelengths of 3.5 cm, 6 cm and 20 cm for NGC 4214 and 6 cm and 20 cm for NGC 4395. These observations were analyzed as part of our ongoing search for candidate radio SNRs in nearby galaxies: the goal of this search is to prepare a large sample of candidate radio SNRs for the purpose of a robust statistical study of the properties of these sources. Based on our analysis, we have confirmed the non-thermal nature of the discrete radio sources alpha and beta in NGC 4214 and classify these sources as candidate radio SNRs based on their positional coincidences with HII regions in that galaxy. We have measured the flux densities of the two candidate radio SNRs at each wavelength and calculated corresponding spectral indices: we have also measured flux densities of two other discrete radio sources in these galaxies - rho in NGC 4214 and #3 in NGC 4395 - which we suspect to be additional candidate radio SNRs based on their positional coincidences with other HII regions in these galaxies. However, the radio data presently available for these sources cannot confirm such a classification and additional observations are needed. We have also calculated the radio luminosities Lradio at the wavelength of 20 cm for these two candidate radio SNRs as well as the corresponding values for the minimum total energy Emin required to power these radio sources via synchrotron emission and the corresponding magnetic field strength Bmin. We have compared our mean calculated values for these properties with the mean values for populations of candidate radio SNRs in other starburst galaxies: while the values for Lradio and Bmin are roughly comparable to the values seen in other starburst galaxies, the mean value for Emin is higher than the mean value of any other starburst galaxy. Finally, we include these two candidate radio SNRs in a discussion of the Sigma-D relation for extragalactic candidate radio SNRs and find that these sources are located on the shallower end of the master Sigma-D relation for all extragalactic SNRs as derived by Urosevic et al. (2005).
Bojicic Ivan
Pannuti Thomas G.
Urosević Dejan
Vukotic Branislav
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