Molecular Environments of Three Large Supernova Remnants in the Third Galactic Quadrant: G205.5+0.5, G206.9+2.3, and G213.0-0.6

Abstract

We present CO observations toward three large supernova remnants (SNRs) in the third Galactic quadrant using the Purple Mountain Observatory Delingha 13.7m radio telescope. The observations are part of the high-resolution CO survey of the Galactic plane between Galactic longitudes l=-10deg to 250deg and latitudes b=-5deg to 5d. CO emission was detected toward the three SNRs: G205.5+0.5 (Monoceros Nebula), G206.9+2.3 (PKS 0646+06), and G213.0-0.6. Both of SNRs G205.5+0.5 and G213.0-0.6 exhibit the morphological agreement (or spatial correspondences) between the remnant and the surrounding molecular clouds (MCs), as well as kinematic signatures of shock perturbation in the molecular gas. We confirm that the two SNRs are physically associated with their ambient MCs and the shock of SNRs is interacting with the dense, clumpy molecular gas. SNR G206.9+2.3, which is close to the northeastern edge of the Monoceros Nebula, displays the spatial coincidence with molecular partial shell structures at VLSR~15km/s. While no significant line broadening has been detected within or near the remnant, the strong morphological correspondence between the SNR and the molecular cavity implies that SNR G206.9+2.3 is probably associated with these CO gas and is evolving in the low-density environment. The physical features of individual SNRs, together with the relationship between SNRs and their nearby objects, are also discussed.

29 pages, 20 figures. Accepted for publication in the ApJ

References in corpus (12)

• Discovery of a point-like very-high-energy gamma-ray source in Monoceros
• A revised catalogue of EGRET gamma-ray sources
• Supernova Remnants Interacting with Molecular Clouds: X-ray and Gamma-ray Signatures
• Updated radio $\Sigma -D$ relation for Galactic supernova remnants
• A large-scale CO survey of the Rosette Molecular Cloud: assessing the effects of O stars on surrounding molecular gas
• APEX observations of supernova remnants - I. Non-stationary MHD-shocks in W44
• Interaction between Cassiopeia A and Nearby Molecular Clouds
• Interaction Between Supernova Remnant G22.7-0.2 And The Ambient Molecular Clouds
• Interaction between the Supernova Remnant HB 3 and the Nearby Star-Forming Region W3
• Discovery of a pre-existing molecular filament associated with supernova remnant G127.1+0.5
• Discovery of Broad Molecular lines and of Shocked Molecular Hydrogen from the Supernova Remnant G357.7+0.3: HHSMT, APEX, Spitzer and SOFIA Observations
• Fermi Large Area Telescope Observations of the Monoceros Loop Supernova Remnant

Cited by in corpus (5)

• The Milky Way Imaging Scroll Painting (MWISP): Project Details and Initial Results from the Galactic Longitude of 25.8deg to 49.7deg
• Local Molecular Gas toward the Aquila Rift Region
• Is HESS J1912+101 associated with an old Supernova Remnant?
• Atlas of CO-Line Shells and Cavities around Galactic Supernova Remnants with FUGIN
• A Large-field J=1-0 Survey of CO and Its Isotopologues Toward the Cassiopeia A Supernova Remnant