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

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

H.-P. Reuter ¹ and C. Kramer <sup>2

1</sup> 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

Abstract

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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Contents

• 1. Introduction
• 2. Observations and calibration
• 3. Data from the submm-range
• 4. The continuum spectra of the sources
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: September 30, 1998
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