The Lyman Continuum Polarization Rise in the QSO PG 1222+228
نویسندگان
چکیده
منابع مشابه
The Puzzle of the Lyman Continuum Polarization of Qsos
Recent spectropolarimetry of QSOs has revealed a surprising rise in polarization in the Lyman continuum of several objects. We discuss several recent attempts to interpret this feature, including the role of Lyman limit absorption in PG 1222+228. We present new theoretical results involving electron scattering in a hot corona or wind above an accretion disk, and polarization resulting from the ...
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The UV to soft X-rays of luminous AGNs dominate their bolometric luminosity, driven by an accretion-powered dynamo at the center. These photons ionize the surrounding gas, thereby providing clues to fueling and exhaust. Two sets of important relationships – neither of them understood – link the continuum and gas properties. (i) Boroson & Green’s ‘eigenvector 1’ relationships: Steeper soft X-ray...
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The Hα luminosity density of galaxies is used to calculate the local diffuse radiation field at the Lyman limit as resulting from star formation in the universe. The fraction of Lyman continuum radiation leaking out from galaxies through their neutral hydrogen is the most uncertain parameter of the calculation. A comparison of the diffuse radiation predicted from galaxies with that measured fro...
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چکیده ندارد.
15 صفحه اولEssential observations of the Lyman continuum
Concurrent observations of Lyman continuum (LyC) and Lyman α (Lyα) emission escaping from star-forming systems at low redshift are essential to understanding the physics of reionization at high redshift (z & 6). Some have suggested reionization is dominated by numerous small galaxies with LyC escape fractions fe ∼ 10%, while others suggest mini-quasars with higher fe might also play a role. At ...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 2000
ISSN: 0004-6280,1538-3873
DOI: 10.1086/316567