Astron. Astrophys. 315, L165-L168 (1996)
First ISOCAM images of the Milky Way*
M. Pérault1,2, A. Omont3, G. Simon4, P. S'eguin1, D. Ojha3, J. Blommaert5, M. Felli6, G. Gilmore7, F. Guglielmo3, H. Habing8, S. Price9, A. Robin10, B. de Batz4, C. Cesarsky11, D. Elbaz11, N. Epchtein4, P. Fouqué12, S. Guest5, D. Levine5, A. Pollock5, T. Prusti5, R. Siebenmorgen5, L. Testi6, and D. Tiphène4
1 Laboratoire de Radioastronomie Millimétrique, ENS and CNRS, Paris, France
Received 16 September 1996 / Accepted 20 September 1996
Abstract. ISOGAL is a 15 m ISOCAM survey of deg2 in the Galactic Plane interior to . In combination with IJK data from the near-infrared southern sky survey DENIS, the ISO images allow the first detailed study of stellar populations throughout the inner Galaxy. We present preliminary results from a test observation at with 6" pixels and completeness limit 8mJy. Of the sources deg-2 detected, about half are KM giants, seen through extinction of up to A , while most of the remainder are probably dusty young stars. Although away from bright IRAS regions, the field displays spectacular emission features, and, unexpectedly, a number of regions which are optically thick at 15 m. The dark regions are presumably dense filaments with A .
Key words: Galaxy: stellar content - interstellar medium: general - interstellar medium: dust, extinction - infrared: galaxies - infrared: 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 the participation of ISAS and NASA; and on DENIS observations collected at the European Southern Observatory.
Last change: December 16, 1996