CAVITY OF MOLECULAR GAS ASSOCIATED WITH SUPERNOVA REMNANT 3C 397
- Department of Astronomy, Nanjing University, Nanjing 210093 (China)
- Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2 (Canada)
- Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA 02139 (United States)
3C 397 is a radio and X-ray bright Galactic supernova remnant (SNR) with an unusual rectangular morphology. Our CO observation obtained with the Purple Mountain Observatory at Delingha, Qinghai Province, China reveals that the remnant is well confined in a cavity of molecular gas and embedded at the edge of a molecular cloud (MC) at the local standard of rest systemic velocity of {approx}32 km s{sup -1}. The cloud has a column density gradient increasing from southeast to northwest, perpendicular to the Galactic plane, in agreement with the elongation direction of the remnant. This systemic velocity places the cloud and SNR 3C 397 at a kinematic distance of {approx}10.3 kpc. The derived mean molecular density ({approx}10-30 cm{sup -3}) explains the high volume emission measure of the X-ray emitting gas. A {sup 12}CO line broadening of the {approx}32 km s{sup -1} component is detected at the westmost boundary of the remnant, which provides direct evidence of the SNR-MC interaction and suggests multi-component gas there with dense ({approx}10{sup 4} cm{sup -3}) molecular clumps. We confirm the previous detection of an MC at {approx}38 km s{sup -1} to the west and south of the SNR and argue, based on H I self-absorption, that the cloud is located in the foreground of the remnant. A list of Galactic SNRs presently known and suggested to be in physical contact with environmental MCs is appended in this paper.
- OSTI ID:
- 21394197
- Journal Information:
- Astrophysical Journal, Vol. 712, Issue 2; Other Information: DOI: 10.1088/0004-637X/712/2/1147; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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