Home > Seminars > Study of Extragalactic Supernova Remnants

Study of Extragalactic Supernova Remnants

Sala de Titulación, Facultad de Ingeniería y Ciencias UDP | October 22 11:00

Maria Kopsacheili
University of Crete


Studies of populations of supernova remnants (SNRs) in different
galaxies provide a more representative picture of their importance for
feedback and metal enrichment in a wide variety of galactic
environments. We present our results on the SNRs populations
in a sample of nearby spiral galaxies (NGC 7793, NGC 55 ,NGC 45, NGC
1313), based on deep narrow-band Hα and [S II] images. We find a total
of ~180 candidate SNRs. We derive the Hα and excitation distributions of
the SNRs, both of which are proxies of the energy deposition on the
galactic interstellar medium (ISM). In our analysis we develop methods
to account for selection effects
that allow us to directly compare results between different galaxies. We
also present a new, efficient, diagnostic tool for identifying SNRs and
measuring their shock velocities based on narrow-band imaging. Through
the effective differentiation from H II regions this diagnostic provides
more complete samples of SNRs including those in later evolutionary
phases with slower shocks.