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A large molecular cloud toward the SNR W50 and SS 433
Huang, Y.-L.; Dame, T. M.; Thaddeus, P.
AA(NASA, Goddard Institute for Space Studies; Columbia University, New York, NY), AB(NASA, Goddard Institute for Space Studies; Columbia University, New York, NY), AC(NASA, Goddard Institute for Space Studies; Columbia University, New York, NY)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 15, 1983, p. 609-614. (ApJ Homepage)
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NASA/STI Keywords:
Molecular Clouds, Nebulae, Radio Astronomy, Supernova Remnants, Carbon Monoxide, Sky Surveys (Astronomy), Stellar Evolution
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The CO 1 yields 0 transition at 115 GHz has been mapped over an area of more than 6 deg sq toward W50, the extended SNR surrounding the peculiar object SS 433. W50 is found to lie at the end of a filamentary molecular cloud 4 deg long and 1 deg wide that closely matches a conspicuous dust lane on the Palomar Sky Survey; the cloud's kinematic distance is within 0.7 of 2.2 kpc, in agreement with the distance 2-3.3 kpc estimated for the SNR, and its mass is about 120,000 solar masses. Though there is little evidence of star formation in the molecular filament, or evidence of an interaction between the filament and W50 (or SS 433), the positional coincidence of the two, their similar distance, and their displacement nearly two molecular scale heights from the plane all suggest a physical relationship or common origin. One possibility is that both the molecular filament and the stellar progenitor of W50 were ejected from a large active molecular complex lying in the plane at l = 40 deg.

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