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| Paper: |
New X-ray and Optical SNRs in Six Nearby Galaxies |
| Volume: |
424, Proceedings of the 9th International Conference of the Hellenic Astronomical Society |
| Page: |
223 |
| Authors: |
Leonidaki, I.; Zezas, A.; Boumis, P. |
| Abstract: |
We present the results from a study of the SNR populations in six nearby galaxies (NGC 2403, NGC 3077, NGC 4214, NGC 4395, NGC 4449 and NGC 5204) based on Chandra archival data. We have detected a sample of 244 discrete X-ray sources with fluxes down to 10-17 erg s-1 cm-2. A total number of 37 X-ray detected SNRs are identified, 30 of which are new, based on their X-ray colors and spectroscopy. We discuss the SNR properties (luminosity, temperature, density) of the X-ray detected SNRs in order to obtain information on their interaction with their environment. We also compare the luminosity distributions of X-ray SNRs in different types of galaxies with the number of our X-ray detected SNRs and we indicate differences between the SNR populations in spiral and irregular galaxies. On the basis of a multi-wavelength study of SNRs, we obtained deep images in the [S II] and Hα emission lines and we initially classified a large number of optical candidate SNRs based on their [S II] / Hα ratio. Follow-up spectro-photometric observations for a number of the candidate SNRs have also been obtained and their spectral signatures suggest that the detected emission originates from shock-heated gas. |
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