Shocked molecular hydrogen towards the Tornado nebula

Abstract

We present near-infrared and millimetre-line observations of the Tornado nebula (G357.7-0.1). We detected 2.12 micron_m H2 1-0 S(1) line emission towards the suspected site of interaction with a molecular cloud revealed by the presence of an OH(1720 MHz) maser. The distribution of the H2 emission is well correlated with the nonthermal radio continuum emission from the Tornado, and the velocity of the H2 emission spans over 100 km/s, which both imply that the H2 emission is shock excited. We also detected millimetre-lines from 12CO and 13CO transitions at the velocity of the maser, and mapped the distribution of the molecular cloud in a 2 x 2 arcmin^2 region around the maser. The peak of the molecular cloud aligns well with an indentation in the nebula's radio continuum distribution, suggesting that the nebula's shock is being decelerated at this location, which is consistent with the presence of the OH(1720 MHz) maser and shocked H2 emission at that location.

10 pages, 8 figures, minor changes, accepted to MNRAS

References in corpus (9)

• OH 1720 MHz Masers in Supernova Remnants --- C-Shock Indicators
• OH (1720 MHz) Masers and Mixed-Morphology Supernova Remnants
• OH Zeeman Magnetic Field Detections Toward Five Supernova Remnants Using the VLA
• Three New Supernova Remnant OH Masers Near the Galactic Center: Evidence for Large Scale Maser Emission from Supernova Remnants
• High Spectral and Spatial Resolution Observations of Shocked Molecular Hydrogen at the Galactic Center
• Molecular and Ionic shocks in the Supernova Remnant 3C391
• VLA Observations of the "Eye of the Tornado"- the High Velocity \HII Region G357.63-0.06
• Shocked molecular gas towards the SNR G359.1-0.5 and the Snake
• UNSWIRF: A Tunable Imaging Spectrometer for the Near-Infrared

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• The 1st Fermi Lat Supernova Remnant Catalog
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• Cavity of Molecular Gas Associated with Supernova Remnant 3C 397
• Enhanced abundances in three large-diameter mixed-morphology supernova remnants
• A Systematic Survey for Broadened CO Emission Toward Galactic Supernova Remnants
• A Survey of Hydroxyl Toward Supernova Remnants: Evidence for Extended 1720 MHz Maser Emission
• The OH (1720 MHz) Supernova Remnant Masers in W44: MERLIN and VLBA Polarization Observations
• Multiwavelength observations of the supernova remnant G349.7+02 interacting with a molecular cloud
• Spatially Resolved Low Frequency VLA observations of the Supernova Remnant 3C 391
• A Galactic Dust Devil: far-infrared observations of the Tornado Supernova Remnant candidate
• Suzaku Discovery of Twin Thermal Plasma from the Tornado Nebula