Zobrazeno 1 - 10
of 629
pro vyhledávání: '"WILLS, D"'
Publikováno v:
Astron.J.134:294-313,2007
We have obtained quasi-simultaneous ultraviolet-optical spectra for 22 out of 23 quasars in the complete PG-X-ray sample with redshift, z<0.4, and M_B<-23. The spectra cover rest-frame wavelengths from at least Lyman-alpha to H-alpha. Here we provide
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703690
Autor:
Shang, Zhaohui, Wills, Beverley J., Robinson, Edward L., Wills, D., Laor, Ari, Xie, Bingrong, Yuan, Juntao
Publikováno v:
Astrophys.J.586:52-71,2003
A unique set of UV-optical spectrograms of 22 low redshift QSOs are investigated using principal component analysis. We find three significant principal components over the broad wavelength range from Ly\alpha to H\alpha. They together account for ab
Externí odkaz:
http://arxiv.org/abs/astro-ph/0211641
For a sample of 51 blazars with extensive optical polarization data, we used circular statistics to calculate the scatter among the polarization position angles for each object. We found that this scatter is correlated with the radio core dominance.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0010215
The Physics of Blazar Optical Emission Regions I: Alignment of Optical Polarization and the VLBI Jet
We collected optical and near IR linear polarization data obtained over 20--30 years for a sample of 51 blazars. For each object, we calculated the probability that the distribution of position angles was isotropic. The distribution of these probabil
Externí odkaz:
http://arxiv.org/abs/astro-ph/0010214
Autor:
Wills, Beverley J., Brotherton, M. S., Laor, A., Wills, D., Wilkes, B. J., Ferland, G. J., Shang, Zhaohui
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 relation
Externí odkaz:
http://arxiv.org/abs/astro-ph/9905091
We have surveyed the optical linear polarimetric properties of 65 soft X-ray selected ROSAT Active Galactic Nuclei (AGN). Most of these sources show low polarization (<1%) and no optical reddening. This is in agreement with the X-ray results suggesti
Externí odkaz:
http://arxiv.org/abs/astro-ph/9810082
A unique, essentially complete sample of 22 QSOs, with high quality soft X-ray spectra from ROSAT, as well as HST and optical spectrophotometry from below Ly-alpha to above H-alpha, is being used to investigate the relationships among the ionizing co
Externí odkaz:
http://arxiv.org/abs/astro-ph/9808059
We have surveyed the optical linear polarization of a completely identified sample of 43 bright soft-X-ray-selected ROSAT AGN. Most (40) of these AGN show low polarization (<1%), and no clear optical reddening. This supports the suggestion from rapid
Externí odkaz:
http://arxiv.org/abs/astro-ph/9712149
We report the detection of ionized absorption in the ASCA spectrum of the narrow-line Seyfert 1 galaxy IRAS 17020+4544. Subsequent optical spectropolarimetry revealed high polarization increasing from 3% in the red to 5% in the blue, indicating elect
Externí odkaz:
http://arxiv.org/abs/astro-ph/9709097
Akademický článek
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