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Omont, A; Gilmore, G; Alard, C; Aracil, B; August, T; Baliyan, K; Blommaert, J; Borsenberger, J; Burgdorf, M; Cesarsky, C; de Batz, B; Egan, M; Egret, D; Epchtein, N; Felli, M; Fouque, P; Ganesh, S; Glass, I; Gredel, R; Groenewegen, M; Habing, H. J; Hennebelle, P; Jiang, B; Joshi, U; Messineo, M; Miville-Deschenes, M. A; Moneti, A; Ojha, D; Ortiz, R; Ott, S; Perault, M; Price, S; Robin, A; Schultheis, M; Schuller, F; Simon, G; Testi, L; Teyssier, D; van Loon, J; Wyse, R; 13-other-authors-of-the-ISOGAL-Collaboration
04/2003Journal Article
Astron.Astrophys. 403 (2003) 975-992 The ISOGAL project is an infrared survey of specific regions sampling the Galactic Plane selected to provide information on Galactic structure,stellar populations,stellar mass-loss and the recent star formation history of the inner disk and Bulge of the Galaxy. ISOGAL combines 7 and 15 micron ISOCAM observations - with a resolution of 6'' at worst - with DENIS IJKs data to determine the nature of the sources and theinterstellar extinction. We have observed about 16 square degrees with a sensitivity approaching 10-20mJy, detecting ~10^5 sources,mostly AGB stars,red giants and young stars. The main features of the ISOGAL survey and the observations are summarized in this paper,together with a brief discussion of data processing and quality. The primary ISOGAL products are described briefly (a full description is given in Schuller et al. 2003, astro-ph/0304309): viz. the images and theISOGAL-DENIS five-wavelength point source catalogue. The main scientific results already derived or in progress are summarized. These include astrometrically calibrated 7 and 15um images,determining structures of resolved sources; identification and properties of interstellar dark clouds; quantification of the infrared extinction law and source dereddening; analysis of red giant and (especially) AGB stellar populations in the central Bulge,determining luminosity,presence of circumstellar dust and mass--loss rate,and source classification,supplemented in some cases by ISO/CVF spectroscopy; detection of young stellar objects of diverse types,especially in the inner Bulge with information about the present and recent star formation rate; identification of foreground sources with mid-IR excess. These results are the subject of about 25 refereed papers published or in preparation.
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