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Astron. Astrophys. 360, 111-119 (2000)

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A survey of selected areas in the galactic plane with ISOCAM * **

M.J. Burgdorf 1, M. Cohen 2, S.D. Price 3, S. Ott 1, M.P. Egan 3, T. de Graauw 4, R.F. Shipman 3,4, S. Ganesh 5,6, C. Alard 5 and F. Schuller 5

1 ISO Data Centre, Astrophysics Division, Space Science Department of ESA, Villafranca del Castillo, P.O. Box 50727, 28080 Madrid, Spain
2 Radio Astronomy Lab., 601 Campbell Hall, University of California, Berkeley, CA 94720, USA
3 Phillips Lab./GPOB, 29 Randolph Rd., Hanscom AFB, MA 01731-3010, USA
4 SRON, Lab. for Space Research, P. O. Box 8009, 9700 AV Groningen, The Netherlands
5 Institut d'Astrophysique de Paris, CNRS, 98bis Bd Arago, 75014 Paris, France
6 Physical Research Laboratory, Navarangpura, Ahmedabad 380009, India

Received 10 November 1999 / Accepted 11 April 2000


Seven 11.6' [FORMULA] 11.6' fields along the inner Galactic plane were imaged by the Infrared Space Observatory's ISOCAM camera to investigate the large scale properties of the Galaxy. We present results from this GPSURVEY program at wavelengths of 10 and 15 µm as well as some complementary observations from the ISOGAL project at 7 µm. Point source detection is complete to a limiting flux of about 10 mJy. There is generally good agreement between the observed source counts and that predicted by the SKY 5 multiwavelength Galactic structure model. However, some discrepancies were found at certain Galactic longitudes, particularly near the Galactic center. Indications of the nature of the excess sources are inferred from the colour histograms.

Key words: surveys – stars: statistics – Galaxy: stellar content – Galaxy: structure – infrared: general – infrared: stars

* ISO is 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.
** This is paper number 5 partially based on data from the ISOGAL project to appear in a refereed journal.

Send offprint requests to: M.J. Burgdorf (mburgdor@iso.vilspa.ese.es)

© European Southern Observatory (ESO) 2000

Online publication: July 27, 2000