Spatially Resolved PAH Emission in Nearby, Low-Metallicity Galaxies

Details Spatially Resolved PAH Emission in Nearby, Low-Metallicity Galaxies Spatially Resolved PAH Emission in Nearby, Low-Metallicity Galaxies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545720h&link_type=abstract

American Astronomical Society, AAS Meeting #215, #457.20; Bulletin of the American Astronomical Society, Vol. 42, p.482

Astronomy and Astrophysics

Astronomy

Scientific paper

Low-resolution mid-infrared Spitzer spectra are presented for three nearby, low-metallicity dwarf galaxies (NGC 55, IC 5152 and NGC 3109) for the purpose of examining polycyclic aromatic hydrocarbon (PAH) emission on a spatially resolved basis. The sample closely brackets the 12 + log(O/H) 8 transition metallicity below which PAH emission strength empirically drops, allowing examination of the processes which contribute to this shift. Fitting the spectra produced quantitative line strengths and flux values for PAH features and atomic lines. Extensive ancillary data allow us to examine the changes in environment (for example, radiation field intensity) and PAH emission strength over scales from 10 to 50 pc. Comparison of the 8 μm/11.3 μm PAH ratio on a spatial basis indicates that these features scale together, and that this ratio shows only minor scatter across the observed region of the galaxies.

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