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Astron. Astrophys. 315, L205-L208 (1996)

ISOCAM CVF observations of the Quintuplet and Object#17 clusters near the Galactic Center*

T. Nagata1, K. Kawara2, 3, T. Onaka4, Y. Kitamura2, and H. Okuda2

1 Department of Physics, Nagoya University, Nagoya 464-01, Japan (nagata@zlab.phys.nagoya-u.ac.jp)
2 Institute of Space and Astronautical Science, Yoshinodai, Sagamihara 229, Japan
3 ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca, E-28080 Madrid, Spain
4 Department of Astronomy, University of Tokyo, Tokyo 113, Japan

Received 17 July 1996 / Accepted 27 August 1996

Abstract. Two fields near the Galactic Center, containing the Quintuplet and Object #17 star-clusters, have been imaged with the ISOCAM circular variable filters (CVFs) in the wavelength range of 2.47 - 3.08 img1.gifm and 3.99 - 9.09 img1.gifm. Emission of [Ar II] 6.99 img1.gifm is detected in the ``pistol-shaped'' H II region (G0.15-0.05) to the south of the Quintuplet cluster. Absorption probably due to O-H stretching vibration (2.8 img1.gifm) is evident in the Quintuplet spectra. In addition, Quintuplet members and the central part of Object #17 have CO2 (4.3 img1.gifm) and CO (4.7 img1.gifm) absorption. Abundant CO2 might be present in these lines of sight.

Key words: dust, extinction - HII regions - ISM: molecules - Galaxy: center - infrared: interstellar: lines

* 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.

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