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CO J=2-1 observations toward the OH 1720 MHz maser in Kes 69

Published online by Cambridge University Press:  03 August 2017

Estela M. Reynoso  and
Jeffrey G. Mangum
Estela M. Reynoso
Affiliation:
Instituto de Astronomía y Física del Espacio, CC 67 Suc 28, (1428) Buenos Aires, Argentina
Jeffrey G. Mangum
Affiliation:
National Radio Astronomy Observatory, 949 North Cherry Avenue, Tucson, AZ 85721-0655, USA

Abstract

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We present CO J=2-1 observations made with the 12 Meter Telescope of NRAO using the On-The-Fly technique, towards the OH 1720 MHz maser detected in direction to the supernova remnant (SNR) Kes 69. OH 1720 MHz masers associated to SNRs are strong evidence of shocked molecular gas, and are proposed to be tracers of SNRs kinematical distances. In our images, the most conspicuous feature positionally coincident with the maser is a cloud at ∼ +41 km s−1. The difference between the velocity of the OH 1720 MHz maser and this cloud is ∼ 30 km s−1. At the systemic velocity of the OH 1720 MHz maser, we detected a weak, small clump with the maser lying at its edge, in agreement with previous findings in other SNRs. We suggest that this small clump has been shocked by the expanding SNR, and the ∼ +41 km s−1 component probably corresponds to gas accelerated by the shock front. We do not discard, however, that the ∼ +41 km s−1 component be just a quiescent, foreground cloud unrelated to Kes 69.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 221 - 224
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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