We report the detection of faint emission in the high-excitation [OIV] 25.90um line in a number of starburst galaxies, from observations obtained with the Short Wavelength Spectrometer (SWS) on board ISO. Further observations of M82 spatially resolve the [OIV] emitting region. Detection of this line in starbursts is surprising since it is not produced in measurable quantities in HII regions around hot main-sequence stars, the dominant energy source of starburst galaxies. We discuss various models for the formation of this line. [OIV] that is spatially resolved by ISO cannot originate in a weak AGN and must be due to very hot stars or ionizing shocks related to the starburst activity. For low-excitation starbursts like M82, shocks are the most plausible source of [OIV] emission.
@article{arxiv.astro-ph/9803314,
title = {Faint [O IV] emission from starburst galaxies},
author = {D. Lutz and D. Kunze and H. W. W. Spoon and M. D. Thornley},
journal= {arXiv preprint arXiv:astro-ph/9803314},
year = {2007}
}
Comments
5 pages Latex (A&A Macros 4), 5 eps figures. Accepted for publication as an A&A Letter. See also http://www.mpe.mpg.de/ISO/preprint/MPE-IR-98001.html