Computer Science
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3674l&link_type=abstract
Spitzer Proposal ID #3674
Computer Science
Scientific paper
LINERs (Low Ionization Emission Line Regions) are the most common form of activity in the nearby universe, yet the ionization mechanism responsible for the line ratios observed in these objects is still controversial. Many of these galaxies have obscured nuclei, which complicates studies based on optical observations. Previous studies which combined different wavelength regions (Satyapal et al. 2003, Filho et al. 2004) found puzzling results and were not able to construct a consistent picture of what powers the emission lines. We propose IRS spectroscopy of a representative sample of LINERs in the mid-IR, for which we have high-resolution Chandra X-ray data, as well as high-resolution optical data. The X-ray data can reveal the presence of an AGN core, while the optical observations constrain the stellar population that may also be contributing to the gas ionization. The mid-IR penetrates dust, and will give a homogeneous set of strategic emission lines. Combining the X-ray and optical data with the mid-IR, we will be able to constrain photoionization models in a very efficient way, allowing us to understand the nature of LINERs and their significance in the global AGN/starburst context.
Armus Lee
Heckman Tim
Leitherer Claus
Martins Lucimara
Ptak Andrew
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