Results 31 to 40 of about 2,405 (218)

On the Continuum Shape of Broad Absorption Line Quasars [PDF]

Publications of the Astronomical Society of Japan, 1999
The continuum shape of 26 broad absorption line (BAL) QSOs is shown to be virtually identical to that of non-BAL QSOs when the spectra of the former are dereddened. A procedure for dereddening of BAL QSO spectra is introduced, based on measurement of the flux in three bands and determination of the colour excess in comparison with an unreddened ...
Tetsuo M. Yamamoto, Vladas Vansevičius
openaire   +1 more source

The Nature of LoBAL QSOs. II. HST/WFC3 Observations Reveal Host Galaxies Dominated by Mergers

The Astrophysical Journal, 2023
Low-ionization broad absorption line QSOs (LoBALs) are suspected to be merging systems in which extreme, active galactic nucleus-driven outflows have been triggered.
Mariana S. Lazarova, Gabriela Canalizo, Mark Lacy, Wyatt Behn, Kaitlyn Raub, Vardha N. Bennert, Duncan Farrah   +6 more
doaj   +1 more source

Fast Outflowing Warm Absorbers in Narrow-line Seyfert 1 Galaxy PG 1001+054 Revealed by HST/COS Spectra

The Astrophysical Journal, 2023
Narrow-line Seyfert 1 (NLS1) galaxies are an important type of active galactic nucleus (AGN), generally expected to be accreting at a high Eddington rate. The properties of their outflows and importance of AGN feedback remain intriguing. We report on the
Xiao-Dan Fu, Junfeng Wang, Xiaoyu Xu, Zhi-Xiang Zhang   +3 more
doaj   +1 more source

Modeling Line-Driven Disk Wind for Broad Absorption Lines of Quasars [PDF]

Publications of the Astronomical Society of Japan, 2013
Abstract The disk wind, which is powered by the radiation force due to spectral lines (line force), has been studied concerning broad absorption line (BAL) quasars. We investigated the structure of the disk wind based on a non-hydrodynamic method, and compared it with wind properties inferred from X-ray observations of BAL quasars.
Nomura, Mariko, Ohsuga, Ken, Wada, Keiichi, Susa, Hajime, Misawa, Toru   +4 more
openaire   +2 more sources

COOL-LAMPS. Discovery of COOL J0335−1927, a Gravitationally Lensed Quasar at z = 3.27 with an Image Separation of 23.″3

The Astrophysical Journal Letters, 2023
We report the discovery of COOL J0335−1927, a quasar at z = 3.27 lensed into three images with a maximum separation of 23.″3 by a galaxy cluster at z = 0.4178. To date, this is the highest redshift wide-separation lensed quasar known.
Kate Napier, Michael D. Gladders, Keren Sharon, Håkon Dahle, Aidan P. Cloonan, Guillaume Mahler, Isaiah Escapa, Josh Garza, Andrew Kisare, Natalie Malagon, Simon Mork, Kunwanhui Niu, Riley Rosener, Jamar Sullivan Jr., Marie Tagliavia, Marcos Tamargo-Arizmendi, Raul Teixeira, Kabelo Tsiane, Grace Wagner, Yunchong Zhang, Megan Zhao   +20 more
doaj   +1 more source

Deep XMM-Newton Observations of an X-ray Weak Broad Absorption Line Quasar at z = 6.5

, 2022
We report X-ray observations of the most distant known gravitationally lensed quasar, J0439+1634 at z = 6.52, which is also a broad absorption line (BAL) quasar, using the XMM-Newton Observatory.
Yang, Jinyi, Chartas, George, Yang, J., Wang, R., LANZUISI, Giorgio, Lanzuisi, G., Venemans, B.P., Wang, F., Wang, Ran, Yue, M., Chartas, G., Cappi, M., Decarli, R., Yue, Minghao, Zabludoff, Ann, Walter, F., Wang, Feige, Wu, X.-B., Fan, Xiaohui, Walter, Fabian, DADINA, MAURO, DECARLI, ROBERTO, Fan, X., Wu, Xue Bing, Jin, X., Zabludoff, A., Keeton, C.R., Keeton, Charles R., Nanni, R., CAPPI, MASSIMO, Jin, Xiangyu, Venemans, Bram P., NANNI, RICCARDO, Dadina, M.   +33 more
core   +1 more source

SDSS J090152.05+624342.6: A NEW “OVERLAPPING-TROUGH” FeLoBAL QUASAR AT Z ~ 2

Frontiers in Astronomy and Space Sciences, 2017
We here report an identification of SDSS J090152.04+624342.6 as a new “overlapping-trough” iron low-ionization broad absorption line quasar at redshift of z ~ 2.1.
Jing Wang, Jing Wang, Dawei Xu, Dawei Xu, Jianyan Wei, Jianyan Wei   +5 more
doaj   +1 more source

THE VIEWING ANGLES OF BROAD ABSORPTION LINE VERSUS UNABSORBED QUASARS [PDF]

The Astrophysical Journal, 2012
It was recently shown that there is a significant difference in the radio spectral index distributions of broad absorption line (BAL) quasars and unabsorbed quasars, with an overabundance of BAL quasars with steeper radio spectra. This result suggests that source orientation does play into the presence or absence of BAL features.
DiPompeo, Michael A., Brotherton, Michael S., De Breuck, Carlos   +2 more
openaire   +2 more sources

The Pan-STARRS1 z > 5.6 Quasar Survey. II. Discovery of 55 Quasars at 5.6 < z < 6.5

The Astrophysical Journal Supplement Series, 2023
The identification of bright quasars at z ≳ 6 enables detailed studies of supermassive black holes, massive galaxies, structure formation, and the state of the intergalactic medium within the first billion years after the Big Bang.
Eduardo Bañados, Jan-Torge Schindler, Bram P. Venemans, Thomas Connor, Roberto Decarli, Emanuele Paolo Farina, Chiara Mazzucchelli, Romain A. Meyer, Daniel Stern, Fabian Walter, Xiaohui Fan, Joseph F. Hennawi, Yana Khusanova, Nidia Morrell, Riccardo Nanni, Gaël Noirot, Antonio Pensabene, Hans-Walter Rix, Joseph Simon, Gijs A. Verdoes Kleijn, Zhang-Liang Xie, Da-Ming Yang, Andrew Connor   +22 more
doaj   +1 more source

A simple disc wind model for broad absorption line quasars [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
Approximately 20% of quasi-stellar objects (QSOs) exhibit broad, blue-shifted absorption lines in their ultraviolet spectra. Such features provide clear evidence for significant outflows from these systems, most likely in the form of accretion disk winds.
Higginbottom, N., Knigge, C., Long, K. S., Sim, S. A., Matthews, J. H.   +4 more
openaire   +5 more sources