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Optical polarization of quasars and the Balmer edge feature revealed by ultraviolet and polarized visible to near-infrared emissions
Hu, RY; 张双南;Zhang, SN
2012
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号426期号:4页码:2847-2858
摘要Polarized emission from a quasar is produced by wavelength-independent electron scattering that surrounds its accretion disc. Thus, contamination from the host galaxy is avoided and the intrinsic emission spectrum of its accretion disc is revealed. Ultraviolet (UV) emission from a quasar is normally free of contamination from its host galaxy. Therefore, the polarization fraction of the quasar's disc emission can be determined by comparing the total UV emission with the polarized visible to near-infrared (NIR) emission. The resulting continuum spectrum from UV to infrared can reveal the theoretically expected Balmer edge absorption feature. We fit the polarized spectra in the visible and NIR bands, together with the total UV spectra of two type 1 quasars (3C 95 and 4C 09.72), to an extended geometrically thin and optically thick accretion disc model. In addition to the standard model, we include the Balmer edge absorption that results from corotational neutral gas on a narrow annulus of the accretion disc. We find that the extended thin accretion disc model provides an adequate description of the continuum spectra of the two quasars from UV to NIR wavelengths. A Monte CarloMarkov chain fitting to the continuum spectra is able to constrain well the true polarization fraction of the disc emission, which allows the Balmer edge feature to be completely revealed from polarized visible to UV continua. The Balmer edge feature is prominent in the spectra of both quasars, and it is significantly broadened because of the orbital motion of the gas in the accretion disc. Therefore, the broadening of the Balmer edge feature is related to the quasar's inclination. In this paper, we prove the concept of determining a quasar's inclination from the Balmer edge feature in its continuum spectra.
关键词methods: data analysis techniques: polarimetric techniques: spectroscopic galaxies: active quasars: general
学科领域Astronomy & Astrophysics
DOI10.1111/j.1365-2966.2012.21515.x
收录类别SCI
WOS记录号WOS:000310064400018
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224212
专题粒子天体物理中心
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Hu, RY,张双南;Zhang, SN. Optical polarization of quasars and the Balmer edge feature revealed by ultraviolet and polarized visible to near-infrared emissions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,426(4):2847-2858.
APA Hu, RY,&张双南;Zhang, SN.(2012).Optical polarization of quasars and the Balmer edge feature revealed by ultraviolet and polarized visible to near-infrared emissions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,426(4),2847-2858.
MLA Hu, RY,et al."Optical polarization of quasars and the Balmer edge feature revealed by ultraviolet and polarized visible to near-infrared emissions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 426.4(2012):2847-2858.
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