A Closer Look at Irregular Galaxies in the Infrared

Details A Closer Look at Irregular Galaxies in the Infrared A Closer Look at Irregular Galaxies in the Infrared

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.6323m&link_type=abstract

American Astronomical Society Meeting 207, #63.23; Bulletin of the American Astronomical Society, Vol. 37, p.1250

Astronomy and Astrophysics

Astronomy

Scientific paper

Irregular (Im) galaxies have received limited attention with infrared satellites because of the difficulty in studying objects of such low surface brightness. The Spitzer Space Telescope allows us a deeper and higher resolution view into the infrared emission of the Im galaxies than has been possible before. Archival data obtained with the Infrared Array Camera (IRAC) was used to examine a sample of Im galaxies in four passbands: 3.6μm, 4.5μm, 5.8μm and 8.0μm. The [3.6] image is primarily starlight, which was compared to optical images. The [4.5] passband emission was separated into stars and hot dust. The [5.8] and [8.0] images are dominated by PAHs (polycyclic aromatic hydrocarbons). The distributions of hot dust and PAHs are compared to Halpha images that map the star-forming regions. Analysis also includes surface photometry of each galaxy and integrated emission.
Support to this project is from the NSF for the REU program at NAU with grant 9988007, as well as NSF grant AST-0204922 to DAH.

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