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Diffuse interstellar clouds associated with dark clouds

1982; IOP Publishing; Volume: 260; Linguagem: Inglês

10.1086/160239

1538-4357

S. R. Federman, R. F. Willson,

Stellar, planetary, and galactic studies

view Abstract Citations (27) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Diffuse interstellar clouds associated with dark clouds. Federman, S. R. ; Willson, R. F. Abstract Measurements of CH emission at 9 cm toward the bright stars Alpha Cam and Kappa Cas and from dark clouds near the stars reveal an association between diffuse clouds and dark clouds. Here the term diffuse clouds refers to clouds seen in optical absorption; the term dark clouds refers to opaque regions on the Palomar Sky Survey observed through radio techniques. The radio emission toward Alpha Cam, and possible emission toward Kappa Cas, occurs at the same velocity as the optical CH absorption. The column densities derived from both techniques are similar. A dark cloud near each star also shows emission at the velocity of absorption. The column density of CH is larger in the dark cloud. From these data, it is concluded that for most lines of sight, diffuse clouds are the outer, relatively transparent portions of dark clouds. Publication: The Astrophysical Journal Pub Date: September 1982 DOI: 10.1086/160239 Bibcode: 1982ApJ...260..124F Keywords: Interstellar Matter; Interstellar Radiation; Nebulae; Centimeter Waves; Electromagnetic Absorption; Radicals; Sky Surveys (Astronomy); Astrophysics full text sources ADS | data products SIMBAD (2)