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Astron. Astrophys. 315, L113-L116 (1996)

ISOCAM view of high energy sources*

I.F. Mirabel1, A. Claret1, C.J. Césarsky1, O. Boulade1, and D.A. Césarsky2

1 Service d'Astrophysique, CEA/DSM/DAPNIA/, Centre d'Etudes de Saclay, F-91191 Gif-sur-Yvette, France
2 Institut d'Astrophysique Spatiale, Université Paris XI, Bât. 121, F-91405 Orsay, France

Received 16 July 1996 / Accepted 7 August 1996

Abstract. We report the discovery of warm dust in the surroundings of the compact high energy sources SS433 and Cygnus X-1. In the jets of SS433 we have observed the infrared counterpart of the brighter X-ray knot at a distance of 50 pc from the compact source. The observation reported here suggests that dust formation takes place in the ejecta, and that their infrared luminosity exceeds their X-ray luminosity. In Cygnus X-1 we find that the compact source is surrounded by an infrared envelope of 0.2 pc radius. We propose that besides a gaseous component, warm dust components contribute to the infrared emission from the extended envelope.

Key words: stars: individual: SS433, Cygnus X-1 - stars: variables: other - ISM: clouds - Gamma rays: observations - infrared: stars - X-rays: stars

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with participation of ISAS and NASA.

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Last change: December 16, 1996
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