Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40398p&link_type=abstract
Spitzer Proposal ID #40398
Other
Scientific paper
SW104409 is a remarkable and peculiar type 2 QSO. It is extremely luminous and absorbed by Compton-thick gas in the X-rays, shows a deep silicate feature in absorption in the mid-infrared, and narrow emission lines in the optical, and it falls in the category of Extremely Red Object. On the other hand, its optical spectrum shows a blue continuum, faint broad and asymmetric emission lines and its near-infrared spectrum is dominated by extremely hot dust emission. In order to explain these apparently contradicting properties, we suggest a scenario in which the inner walls of the obscuring torus are visible, an external dust component in the host galaxy produces the observed absorption signatures, and the optical continuum and broad lines are from scattered light. The probe that the observed absorption signatures are produced by dust in the host, will imply that there are even less real type 2 AGNs than it appears and the fraction of type 2 AGNs at high luminosities is even smaller as originally inferred, supporting the 'receding torus' scenario. In order to test this scenario, we propose to obtain a high (>30) S/N IRS low-resolution spectrum of SW1044009. Such a high quality spectrum will allow us to better characterize the near-infrared continuum and spectral features. The most recent clumpy torus models for highly obscured systems will be tested by comparing their predictions with the observed spectrum. There are few known sources in the literature with similar mid-infrared properties, but SW104409 is the brightest among all of them and benefits from a much richer multi-wavelength data set, from X-ray to radio. SW104409 is the only source of this kind to be bright enough to study in detail with a reasonable request of time (3 hours).
Farrah Duncan
Hoenig Sebastian
Lonsdale Carol
Owen Frazer
Polletta Mari
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