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Astron. Astrophys. 315, L329-L332 (1996)

ISOCAM mapping of the img1.gif Ophiuchi main cloud

A. Abergel1, J.P. Bernard1, F. Boulanger1, C. Cesarsky4, F.X. Désert1, E. Falgarone2, G. Lagache1, M. Perault2, J.-L. Puget1, W.T. Reach1, L. Nordh3, G. Olofsson3, M. Huldtgren3, A.A. Kaas3, P. André4, S. Bontemps3,4, M. Burgdorf5, E. Copet6, J. Davies7, T. Montmerle4, P. Persi8, and F. Sibille9

1 Institut d'Astrophysique Spatiale, Université Paris-Sud, Bât.121, F-91405 Orsay, France
2 Radioastronomie Millimétrique, Ecole Normale Supérieure, 24 rue Lhomond, F-75005 Paris, France
3 Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden
4 Service d'Astrophysique, Centre d'Etudes de Saclay, F-91191 Gif-Sur-Yvette Cedex, France
5 ISO, Villafranco del Castillo, ESA Satellie tracking station, POB 50727, E-28080 Madrid, Spain
6 DESPA, Observatoire de Paris-Meudon, 5 place Jules Janssen, F-92195 Meudon Cedex, France
7 Joint Astronomy Center, 660 N. A'Ohoku Place, University Park, Hilo, HI 96720, USA
8 Instituto Astrofisica Spaziale, CNR, v. E. Fermi 21, I-00044 Frascati, Italy
9 Observatoire de Lyon, F-69230 Saint Genis Laval, France

Received 16 July 1996 / Accepted 1 September 1996

Abstract. We present preliminary results of the ISOCAM survey of the img1.gif Ophiuchi main cloud L1688 (0.5 square degrees) conducted in the two broad-band filters LW2 (5-8.5 img2.gifm) and LW3 (12-18 img2.gifm). This letter focuses on the properties of the extended emission. ISOCAM observations have revealed several previously unknown characteristics of the mid-IR diffuse emission: the small scale filamentary structure (thickness img3.gif 0.03 pc) of the emission at the illuminated edge of the molecular cloud, the sharpness of color variations at cloud edges, the barely resolved filamentary structure of the dust emission surrounding a bright embedded source, and several dense cores seen as sharp and deep absorption structures against the diffuse cloud background.

Key words: - ISM: individual objects: img1.gif Ophiuchus - ISM: dust, extinction - ISM: clouds - infrared: ISM: clouds

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Last change: December 16, 1996
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