Interaction between the Supernova Remnant HB 21 and Molecular Clouds

Details Interaction between the Supernova Remnant HB 21 and Molecular Clouds Interaction between the Supernova Remnant HB 21 and Molecular Clouds

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...637..283b&link_type=abstract

The Astrophysical Journal, Volume 637, Issue 1, pp. 283-295.

Astronomy and Astrophysics

Astronomy

21

Ism: Individual: Alphanumeric: Hb 21, Ism: Kinematics And Dynamics, Ism: Molecules, Radio Lines: Ism, Ism: Supernova Remnants

Scientific paper

We have carried out 12CO J=1-0 observations toward the mixed-morphology supernova remnant (SNR) HB 21 using the SRAO 6 m telescope. The whole area of the SNR was covered using full-beam grid spacing (2') and partly using half-beam spacing (1'). We discovered shocked clouds with broad (Δv>~10 km s-1) emission lines in the north, northwest, and center of the SNR. The large (~20') cloud in the northwest has a bow-shaped morphology and enhanced radio emission along the cloud boundary. Toward the central, X-ray-bright area of the remnant, sensitive CO observations have revealed small broad-line clouds. They are probable candidates for the evaporating clouds, which may be responsible for the enhanced thermal X-rays in the central area. Shocked clouds have also been discovered in the northern V-shaped radio structure. Our results suggest that the unusual radio features and the central thermal X-ray enhancements of HB 21 might be the result of an interaction with molecular clouds. High-resolution mappings of two shocked, 1' sized clumps were made with the NRO 45 m telescope. For the U-shaped clump in the north, we have found that temperature and density increase near the bottom of the U-shape. The observed features coincide with the theoretical expectation for a cloud swept by a shock wave propagating from the south to the north. For the other shocked clump in the south, the central velocity systematically changes with a gradient of 11 km s-1 pc-1. We suggest 1.7 kpc as the distance to HB 21 by considering all available distance estimates.

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