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Astron. Astrophys. 339, 183-186 (1998)

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The mm-to-submm continuum spectra of W 3(OH) and K 3-50A

H.-P. Reuter 1 and C. Kramer 2

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53151 Bonn, Germany
2 1. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany

Received 3 June 1998 / Accepted 26 June 1998


We present a model for the integrated flux density of W 3(OH) and K 3-50A allowing these sources to be used as reliable secondary calibrators between 80 and 800 GHz. Using new narrow-band continuum measurements between 86-245 GHz with the 30m telescope and reasonable assumptions about the source sizes, we construct continuum spectra from the mm-to-submm range which are in very good agreement with previously published data. With the fit parameters given in this paper, observers at any single-dish telescope will be able to calculate the expected flux densities of the two sources at any given aperture and frequency.

Key words: (ISM:) H ii regions – ISM: individual objects: K 3-50A – ISM: individual objects: W 3(OH) – radio continuum: ISM

Send offprint requests to: H.-P. Reuter, MPIfR, Bonn

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© European Southern Observatory (ESO) 1998

Online publication: September 30, 1998