The molecular clump towards the eastern border of SNR G18.8+0.3

Abstract

The eastern border of the SNR G18.8+0.3, close to an HII regions complex, is a very interesting region to study the molecular gas that it is probably in contact with the SNR shock front. We observed the aforementioned region using the Atacama Submillimeter Telescope Experiment (ASTE) in the 12CO J=3-2, 13CO J=3-2, HCO+ J=4-3, and CS J=7-6 lines with an angular resolution of 22". To complement these observations, we analyzed IR, submillimeter and radio continuum archival data. In this work, we clearly show that the radio continuum "protrusion" that was early thought to belong to the SNR is an HII regions complex deeply embedded in a molecular clump. The new molecular observations reveal that this dense clump, belonging to an extended molecular cloud that surrounds the SNR southeast border, is not physically in contact with SNR G18.8+0.3, suggesting that the SNR shock front have not yet reached it or maybe they are located at different distances. We found some young stellar objects embedded in the molecular clump, suggesting that their formation should be approximately coeval with the SN explosion.

Accepted for publication in A&A (Sept. 7, 2012)

References in corpus (2)

• The Bolocam Galactic Plane Survey IV: 1.1 and 0.35 mm Dust Continuum Emission in the Galactic Center Region
• Radio and X-ray images of SNR G18.8+0.3 interacting with molecular clouds

Cited by in corpus (7)

• Radio emission from Supernova Remnants
• Radio Evolution of Supernova Remnants Including Non-linear Particle Acceleration: Insights from Hydrodynamic Simulations
• On the supernova remnants with flat radio spectra
• Thermal radio absorption as a tracer of the interaction of SNRs with their environments
• Atlas of CO-Line Shells and Cavities around Galactic Supernova Remnants with FUGIN
• An X-ray study of the supernova remnant G20.0-0.2 and its surroundings
• The southern molecular environment of SNR G18.8+0.3