The Interstellar Medium around the Supernova Remnant G320.4-1.2

Abstract

Using the Australia Telescope Compact Array, we have carried out a survey of the HI emission in the direction of the ``barrel-shaped'' supernova remnant (SNR) G320.4-1.2 (MSH 15-52) and its associated young pulsar B1509-58. The angular resolution of the data is 4.0x2.7 arcmin, and the rms noise of the order of 30 mJy/beam (~0.5 K). The HI observations indicate that the N-NW radio limb has encountered a dense HI filament (density ~12 cm^-3) at the same LSR velocity than that of the SNR (V_LSR ~ -68 km/s). This HI concentration would be responsible for the flattened shape of the NW lobe of G320.4-1.2, and for the formation of the radio/optical/X-ray nebula RCW 89. The emission associated with the bright knots in the interior of RCW 89 can be explained as arising from the interaction between the collimated relativistic outflow from the pulsar and the denser part of this HI filament (density ~15 cm^-3). The S-SE half of the SNR, on the other hand, seems to have rapidly expanded across a lower density enviroment (density ~0.4 cm^-3). The HI data also reveal an unusual HI feature aligned with a collimated outflow generated by the pulsar, suggestive of association with the SNR. The anomalous kinematical velocity of this feature (V_LSR ~ 15 km/s), however, is difficult to explain.

7 pages, including 3 embedded PS figures + 4 separate JPEG images. Uses emulateapj.sty. Accepted to AJ

References in corpus (1)

• The Southern Galactic Plane Survey: The Test Region

Cited by in corpus (13)

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• Extracting Rotational Energy in Supernova Progenitors: Transient Poynting Flux Growth vs. Turbulent Dissipation
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• High-resolution Radio Study of Pulsar Wind Nebula MSH 15-52 and Supernova Remnant RCW 89
• High Velocity HI Jet-like Feature Towards the SNR Candidate G351.7-1.2