Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

Astron. Astrophys. 334, 1056-1059 (1998)

Next Section Table of Contents

Solid CO2 towards NGC7538 IRS1 *

G. Strazzulla 1, B. Nisini 2, G. Leto 3, M.E. Palumbo 1 and P. Saraceno 2

1 Osservatorio Astrofisico di Catania, V.le A. Doria 6, I-95125 Catania, Italy
2 CNR Istituto di Fisica dello Spazio Interplanetario, CP27, I-00044 Frascati, Italy
3 CNR Istituto di Radioastronomia, Stazione di Noto, Siracusa, Italy

Received 22 October 1997 / Accepted 19 February 1998


We report the observation of the young infrared source NGC7538 IRS1 with the Short Wavelength Spectrometer (SWS) onboard the ISO satellite in the 2.4-45 µm range. The spectrum exhibits several absorption features due to silicates and to molecular species frozen on the refractory dust. In particular the stretching and bending mode of solid CO2 have been identified. In this paper we present a comparison of the observed absorption band at about 15.1 µm (660 cm-1) attributed to the bending mode of solid CO2 with laboratory spectra of ion irradiated ice mixtures.

Key words: ISM: molecules – dust, extinction – infrared: ISM: lines and bands – ISM: individual objects: NGC7538 IRS1

* 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) with the participation of ISAS and NASA.

Send offprint requests to: M.E. Palumbo

SIMBAD Objects


Next Section Table of Contents

© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998