The Interstellar Medium of Star-forming Irregular Galaxies: The View with ISO

Details The Interstellar Medium of Star-forming Irregular Galaxies: The View with ISO The Interstellar Medium of Star-forming Irregular Galaxies: The View with ISO

2000-12-15

arxiv.org/abs/astro-ph/0012354v1

Astrophys.J.553:121-145,2001

Astronomy and Astrophysics

Astrophysics

To be published in ApJ, Apr 10, 2001; higher resolution figures available from ftp.lowell.edu, cd pub/dah/isopaper/

Scientific paper

10.1086/320654

We present mid-infrared imaging and far-infrared (FIR) spectroscopy of 5 IBm galaxies observed by ISO as part of our larger study of the inter- stellar medium of galaxies. Most of the irregulars in our sample are very actively forming stars. The mid-infrared imaging was in a band centered at 6.75 microns that is dominated by polycyclic aromatic hydrocarbons (PAHs) and in a band centered at 15 microns that is dominated by small dust grains. The spectroscopy of 3 of the galaxies includes [CII]158 microns and [OI]63 microns, important coolants of photodissociation regions (PDRs), and [OIII]88 microns and [NII]122 microns, which come from ionized gas. [OI]145 microns and [OIII]52 microns were measured in one galaxy as well. These data are combined with PDR and HII region models to deduce properties of the interstellar medium of these galaxies.

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