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Astron. Astrophys. 325, 98-108

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10 µm imaging and HI observations
of the Blue Compact Dwarf galaxy He 2-10*

M. Sauvage1, T.X. Thuan2,1, and P.O. Lagage1

1CEA, DSM, DAPNIA, Service d'Astrophysique, C.E. Saclay, F-91191 Gif-sur-Yvette Cedex, France
2Astronomy Department, University of Virginia, P.O. Box 3818, University Station, Charlottesville, VA 22903-0818, USA

Received 24 October 1996 / Accepted 18 March 1997


We have observed the Blue Compact Dwarf (BCD) galaxy He 2-10 in the ~ 10 µm mid-infrared (MIR) atmospheric window using broad-band filters centered at FORMULA µm and FORMULA µm. In both filters, only the galaxy's central regions were detected. One of the UV emitting regions is not detected, implying an older age. The central region contains two resolved components which have the same MIR properties but different HFORMULA fluxes. We interpret these properties in terms of differing star forming histories. Based on its morphology, we show that the MIR emission is unambiguously associated with the young massive stars. We study the spatial variations of the MIR color and conclude that they imply the existence of a hot grain contribution to the 11.65 µm flux in the central regions of the starburst. We also present a new single-dish measurement of the HI content of He 2-10.

Key words: galaxies: individual: He 2-10 - galaxies: general - ISM: dust - infrared: galaxies - stars: formation

*based on data obtained at the Canada-France-Hawaii Telescope, at E.S.O. La Silla, and at NRAO Green Bank

Send offprint requests to: msauvage@cea.fr, or visit: http://dphs10.saclay.cea.fr/Publications/publications.html

© European Southern Observatory (ESO) 1997