Evidence for Shocked Molecular Gas in the Galactic SNR CTB 109 (G109.1-1.0)

Abstract

We report the detection of molecular clouds around the X-ray bright interior feature in the Galactic supernova remnant (SNR) CTB 109 (G109.1-1.0). This feature, called the Lobe, has been previously suggested to be the result of an interaction of the SNR shock wave with a molecular cloud complex. We present new high resolution X-ray data from the Chandra X-ray Observatory and new high resolution CO data from the Five College Radio Observatory which show the interaction region with the cloud complex in greater detail. The CO data reveal three clouds around the Lobe in the velocity interval -57 < v < -52 km s^-1. The velocity profiles of 12CO at various parts of the east cloud are well fit with a Gaussian; however, at the position where the CO cloud and the Lobe overlap, the velocity profile has an additional component towards higher negative velocities. The molecular hydrogen density in this part of the cloud is relatively high (N_H2 = 1.9 x 10^20 cm^-2), whereas the foreground absorption in X-rays (N_H = 4.5 x 10^21 cm^-2), obtained from Chandra data, is lower than in other parts of the cloud and in the north and south cloud. These results indicate that this cloud has been hit by the SNR blast wave on the western side, forming the bright X-ray Lobe.

arXiv commentAccepted for publication in ApJL. 3 figures

References in corpus (5)

• ASCA Observations of the Supernova Remnant IC 443: Thermal Structure and Detection of Overionized Plasma
• OH (1720 MHz) Masers and Mixed-Morphology Supernova Remnants
• XMM-Newton observations of the Galactic Supernova Remnant CTB 109 (G109.1-1.0)
• Infrared Spectroscopy of Molecular Supernova Remnants
• The distance to the SNR CTB109 deduced from its environment

Cited by in corpus (22)

• Cavity of Molecular Gas Associated with Supernova Remnant 3C 397
• Comparing Neutron Star Kicks to Supernova Remnant Asymmetries
• Radio and X-ray images of SNR G18.8+0.3 interacting with molecular clouds
• Discovery of molecular shells associated with supernova remnants. (II) Kesteven 75
• Fermi-LAT Observations and A Broadband Study of Supernova Remnant CTB 109
• Enhanced Cosmic Ray Flux and Ionization for Star Formation in Molecular Clouds Interacting with Supernova Remnants
• Discovery of Molecular Shells Associated with Supernova Remnants. I. Kesteven 69
• A young SNR illuminating nearby Molecular Clouds with cosmic rays
• Wind nebulae and supernova remnants of very massive stars
• Chandra observation of the Galactic supernova remnant CTB 109 (G109.1-1.0)
• Kinematics of the Galactic SNR G109.1-1.0 (CTB 109)
• Distance to the SNR CTB 109/AXP 1E 2259+586 by HI absorption and self-absorption
• Suzaku Studies of the Supernova Remnant CTB~109 Hosting the Magnetar 1E~2259+586
• ALMA CO Observations of Gamma-Ray Supernova Remnant N132D in the Large Magellanic Cloud: Possible Evidence for Shocked Molecular Clouds Illuminated by Cosmic-Ray Protons
• High resolution CO observations towards the Bright Eastern Knot of the SNR Puppis A
• SRAO CO Observation of 11 Supernova Remnants in l = 70 to 190 deg
• The Age Evolution of the Radio Morphology of Supernova Remnants
• CO J=1-0 and J=2-1 Line Observations of the Molecular Cloud - Blocked Supernova Remnant 3C434.1
• 3D Hydrodynamic Simulations of the Galactic Supernova Remnant CTB 109
• Is the SNR HESS J1731-347 colliding with molecular clouds?
• Molecular Clouds Associated with {H \small{II}} regions and Candidates within l = 106.65${}^{\circ }$ to 109.50${}^{\circ }$ and b = $-$1.85${}^{\circ }$ to 0.95${}^{\circ }$
• 3D MHD simulations of the supernova remnant CTB 109