Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50038s&link_type=abstract
Spitzer Proposal ID #50038
Other
Scientific paper
IRAS F00183-7111 is one of the most luminous ULIRGs discovered by IRAS. Follow-up ISO spectroscopy revealed the central power sources to be deeply buried in thick layers of gas and dust. While rare at the time, Spitzer spectroscopy has since identified many ULIRGs to have very strongly obscured nuclei. And as is the case for most of them, the nature of the dominant central power source is hard to constrain, and evidence for both a powerful active galactic nucleus (AGN) and a massive starburst exist, with high margins of uncertainty. What sets apart IRAS F00183-7111 from other ULIRGs observed with Spitzer is its very unusual combination of 6.2 micron PAH equivalent width and depth of the 10 micron silicate feature. In the diagnostic diagram based on these two observables 95% of the ULIRGs are found on either of two `forks' (or branches): one connecting starburst-dominated sources at the base of the fork with AGN-dominated sources at the tip; the other connecting starburst-dominated sources with deeply obscured central sources at its tips. IRAS F00183-7111 seems to be transitioning between the extreme ends of these tips, away from the deeply obscured branch to the AGN-dominated branch. Recently, we found evidence in support of such an evolutionary scenario, based on the discovery of a uniquely broad, very strong, blue-asymmetric emission line of [Ne II] in the Spitzer IRS spectrum. This emission traces optically obscured highly disturbed gas at the base of a nuclear outflow, possibly disrupting the obscuring medium and exposing the central AGN. We propose to reobserve IRAS F00183-7111 at 3-10 times higher S/N to find further spectroscopic evidence in support of this evolutionary scenario.
Farrah Duncan
Houck James
Spoon Henrick
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