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A new age and distance indicator of SNRs with nonthermal X-ray filaments

Published online by Cambridge University Press:  12 May 2006

Aya Bamba ,
Ryo Yamazaki  and
Junko S. Hiraga
Aya Bamba
Affiliation:
RIKEN (The Institute of Physical and Chemical Research) 2-1, Hirosawa, Wako, Saitama 351-0198, Japan email: bamba@crab.riken.jp
Ryo Yamazaki
Affiliation:
Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan email: ryo@vega.ess.sci.osaka-u.ac.jp
Junko S. Hiraga
Affiliation:
Department of High Energy Astrophysics Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA) 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan email: jhiraga@astro.isas.jaxa.jp
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Abstract

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It is discovered that young SNRs have very thin filaments emitting nonthermal X-rays from accelerated electrons. In this paper, a new age and distance indicator is proposed using the spectral and spatial features of nonthermal filaments. We applied this method to the Vela Jr. SNR, for which age and distance are still unknown, and estimated that this SNR is one of the nearest and youngest SNR in our Galaxy: the estimated distance and age are 0.33 (0.26–0.50) kpc and 660 (420–1400) years, respectively.

Keywords

methods: data analysissupernova remnantsX-rays: individual (Vela Jr.)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 29 - 30
Copyright
2006 International Astronomical Union