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Two GeV-TeV Supernova Remnants without Associated Neutral and Molecular Clouds

Published online by Cambridge University Press:  21 February 2014

W. Tian ,
D. Leahy ,
H. Zhu  and
H. Su
W. Tian
Affiliation:
National Astronomical Observatories, CAS, Beijing, China, Email: tww@bao.ac.cn
D. Leahy
Affiliation:
Department of Physics & Astronomy, University of Calgary, Calgary, Canada
H. Zhu
Affiliation:
National Astronomical Observatories, CAS, Beijing, China, Email: tww@bao.ac.cn
H. Su
Affiliation:
National Astronomical Observatories, CAS, Beijing, China, Email: tww@bao.ac.cn
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Abstract

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TeV gamma ray emissions have been detected at the directions of supernova remnants (SNRs) W51C and Tycho SNR. We analyze the Hi absorption spectra towards W51C, Tycho SNR and their nearby compact sources. We conclude that W51C is at a distance of about 4.3 kpc and Tycho SNR has a distance of 2.5 ~ 3.0 kpc. Our study detects high-velocity Hi clouds which coincide with star formation region W51B, but finds that the clouds are behind W51B which argues against previous claims that W51C has shocked the high velocity Hi clouds. We argue that Tycho SNR is naked Ia SNR (lack of evidence of interacting with adjacent neutral and molecular cloud). This gives two examples that the very high gamma ray emission from SNRs does not likely originate from SNR-cloud interaction.

Keywords

ISM: kinematics and dynamicsISM: supernova remnantsISM: cosmic rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 229 - 231
Copyright
Copyright © International Astronomical Union 2014 

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