Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf...18l&link_type=abstract
10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the detection of new optically emitting Supernova Remnants (SNRs) in six nearby galaxies, using deep narrow band Halpha and [S II] images as well as spectroscopic observations. The SNR classification was based on the detected sources that fulfill the well-established emission line flux criterion of [S II]/Halpha > 0.4. This study revealed ~400 photometric SNRs down to a limiting flux of 10-16 erg/sec /cm2, ~350 of which are new identifications. 130 photometric SNRs were spectroscopically observed and 63 outlined their shock-excited nature, verifying that the used photometric method is a robust diagnostic tool for the preliminary identification of SNRs. We compare the derived SNR properties (such as electron density, luminosity, number of SNRs) in different types of galaxies and hence different environments, in order to investigate their interaction with the surrounding interstellar medium. We also cross-correlate parameters of the optically detected SNRs ([S II]/Halpha ratio, luminosity) with parameters (temperature, luminosity) of coincident X- ray emitting SNRs, resulted from our previous studies in the same sample of galaxies, in order to understand their evolution and investigate possible selection effects.
Boumis Panayotis
Leonidaki Ioanna
Zezas Andreas
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