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21-Cm Line Absorption Study of Extended Supernova Remnants

Published online by Cambridge University Press:  14 August 2015

Fumio Sato
Fumio Sato*
Affiliation:
Chiba Prefecture Education Center, Chiba, Japan

Abstract

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By using the Maryland-Green Bank Galactic 21-cm Line Survey, a series of equal-velocity contour diagrams has been constructed for the regions of the extended sources W51 and W44. The non-thermal component of W51 has no absorption features above 53 km s-1, but its thermal components have clear absorption features up to much higher velocities. From this fact, the association of the thermal and nonthermal components of W51 is rejected. Absorption features toward W44 cannot be seen above 50 km s-1. Kinematic distances to the nonthermal component of W51 and to W44 are 4.4 kpc and 3.5 kpc, respectively. From peculiar brightness distributions in the equal-velocity contour diagrams I conclude that a dense Hicloud, as well as clouds of OH and H2CO, is associated with W44.

Type
Part 3: Supernova Remnants
Information
Symposium - International Astronomical Union , Volume 60: Galactic Radio Astronomy , 1974 , pp. 363 - 368
Copyright
Copyright © Reidel 1974 

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