X-RAY MEASURED DYNAMICS OF TYCHO'S SUPERNOVA REMNANT
- Code 662, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
- Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019 (United States)
- RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
- Faculty of Engineering, Department of Applied Physics, University of Miyazaki, 1-1 Gakuen Kibana-dai Nishi, Miyazaki 889-2192 (Japan)
- Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043 (Japan)
We present X-ray proper-motion measurements of the forward shock and reverse-shocked ejecta in Tycho's supernova remnant, based on three sets of archival Chandra data taken in 2000, 2003, and 2007. We find that the proper motion of the edge of the remnant (i.e., the forward shock and protruding ejecta knots) varies from 0.''20 yr{sup -1} (expansion index m = 0.33, where R = t{sup m} ) to 0.''40 yr{sup -1} (m = 0.65) with azimuthal angle in 2000-2007 measurements, and 0.''14 yr{sup -1} (m = 0.26) to 0.''40 yr{sup -1} (m = 0.65) in 2003-2007 measurements. The azimuthal variation of the proper motion and the average expansion index of approx0.5 are consistent with those derived from radio observations. We also find proper motion and expansion index of the reverse-shocked ejecta to be 0.''21-0.''31 yr{sup -1} and 0.43-0.64, respectively. From a comparison of the measured m-value with Type Ia supernova evolutionary models, we find a pre-shock ambient density around the remnant of approx<0.2 cm{sup -3}.
- OSTI ID:
- 21392264
- Journal Information:
- Astrophysical Journal, Vol. 709, Issue 2; Other Information: DOI: 10.1088/0004-637X/709/2/1387; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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