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Published October 29, 1981 | public
Journal Article

Compact radio source 1413 + 135 is a far-IR extragalactic object


The radio source 1413 + 135 is shown to be one of the strongest known emitters of millimetre radiation. The energy distribution of this object measured between metre and X-ray wavelengths reveals that most of the power emitted by this object comes out at millimetre and far-IR wavelengths. If the emission at 1 mm is due to incoherent synchrotron radiation, then the source must be very compact, with a size around 25 µ arc s, and contain a magnetic field larger than 10 G. The steep spectral index in the near-IR is attributed to a high-energy cutoff in the distribution of synchrotron emitting electrons at a Lorentz factor γ ~ 300.

Additional Information

© 1981 Nature Publishing Group. Received 26 May; accepted 25 August 1981. We thank A. I. Sargent, D. J. Ennis, M. Werner, K. Matthews, L. Rickard and the staffs of the 5-m telescope and the Kuiper Airborne Observatory for assistance. The near-IR dewar used for the 1981 March observations was built by K. Matthews, J. Lacy and S. E. Persson. We thank Drs G. Rieke, H. Aller and J. Bregman for useful discussions and for communicating data before publication. Drs T. Pearson, S. Gull and M. Burkinshaw used some of their telescope time to monitor the 2.8-cm emission from 1413+135 while the Palomar results were obtained. Finally we thank Dr R. Blandford, A. Readhead and S. Pravdo for useful discussions. C.A.B. thanks Dr P. Dewdney and the staff of the Dominion Radio Astrophysical Observatory for their hospitality. Millimetre astronomy at Caltech is supported by a NASA grant. Near-IR observations at Caltech are supported by grants from the NSF and NASA. Far-IR astronomy at the University of Texas is supported by a grant from NASA. A.W. thanks OVRO (NSF grant AST-79-16815) for support during this study.

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