Physics – Optics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10408h&link_type=abstract
HST Proposal ID #10408
Physics
Optics
Hst Proposal Id #10408 Agn/Quasars
Scientific paper
The polarimetry capability of the ACS will be used to image the extended emission in the most extreme Hyperluminous Infrared Galaxy and Type-2 QSO: IRAS F15307+3252. Ground-based imaging polarimetry reveals high polarization, but does not have sufficient spatial resolution to resolve the source of the polarization, much less elucidate its structure. Previous WFPC2 and ACS observations without polarimetry optics reveal at least two companions and extended emission near the QSO. However, the nature of this structure is unknown. It could be powered by starburst light from an interaction, or it may be debris lit by the central misdirected QSO. Our proposed observations will completely remove this uncertainty. If the extended emission is the source of polarized light, the observations will highly constrain its physical structure and enable detailed modeling of this prototypical Type-2 QSO. If it is not the source of polarized light, then the observations combined with previous HST images will place very tight constraints on the stellar population {or line emission} responsible for the emssion. Either way, as the most extreme object of its class, the results will have a fundamental impact on our understanding of the Hyperluminous Infrared Galaxy phenomenon which may be a dominant phase of galaxies and QSOs in the high redshift universe.
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