Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20549j&link_type=abstract
Spitzer Proposal ID #20549
Astronomy and Astrophysics
Astrophysics
Scientific paper
We propose to address two long-standing astrophysical questions. The first is whether it is AGNs or starbursts that are the dominant energy generation process in luminous infrared galaxies. The second is whether there is evidence for a connection between starbursts and AGNs. Investigation of these ideas for the past 20 years has been pursued chiefly using optical spectroscopy, but since both these processes are deeply buried in dust, the results of such studies have never been conclusive. Mid-infrared IRS spectroscopy with the SST offers the opportunity to make a significant advance in addressing these two astrophysical issues by probing astrophysical processes much more deeply into the dust. We now have mid-infrared diagnostics which have been shown to clearly distinguish starbursts and AGNs. The SST and IRS provide the highest sensitivity that has ever been available for such measurements, thereby offering the opportunity to make a significant advance in addressing these two astrophysical issues.
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