Results 71 to 80 of about 16,078 (195)

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 Physical Properties of Low-redshift FeLoBAL Quasars. IV. Optical–Near-IR Spectral Energy Distributions and Near-IR Variability Properties

The Astrophysical Journal
We present the optical–near-infrared spectral energy distributions (SED) and near-infrared variability properties of 30 low-redshift iron low-ionization Broad Absorption Line quasars (FeLoBALQs) and matched samples of LoBALQs and unabsorbed quasars ...
Karen M. Leighly, Hyunseop Choi, Michael Eracleous, Donald M. Terndrup, Sarah C. Gallagher, Gordon T. Richards   +5 more
doaj   +1 more source

The Transition from "Normal" to "Broad Absorption Line Quasar" of Ton 34

, 2010
We report the emergence of a high velocity, broad absorption line outflow in the luminous quasar Ton 34, at z=1.928. The outflow is detected through an ultraviolet CIV broad absorption line, in a spectrum obtained in January 2006 by the Sloan Digital Sky
Abazajian, Andrade-Velázquez, Arav, Binette, Binette, Elvis, Everett, Gabel, Ganguly, Gibson, Hamann, Haro-Corzo, Hopkins, Kaspi, Krongold, Krongold, Leighly, Lundgren, Nicastro, Ostriker, Proga, Scannapieco, Schlegel, Telfer   +23 more
core   +1 more source

C IV BROAD ABSORPTION LINE ACCELERATION IN SLOAN DIGITAL SKY SURVEY QUASARS [PDF]

The Astrophysical Journal, 2016
ABSTRACT We present results from the largest systematic investigation of broad absorption line (BAL) acceleration to date. We use spectra of 140 quasars from three Sloan Digital Sky Survey programs to search for global velocity offsets in BALs over timescales of ≈2.5–5.5 years in the quasar rest frame.
C. J. Grier, W. N. Brandt, P. B. Hall, J. R. Trump, N. Filiz Ak, S. F. Anderson, Paul J. Green, D. P. Schneider, M. Sun, M. Vivek, T. G. Beatty, Joel R. Brownstein, Alexandre Roman-Lopes   +12 more
openaire   +4 more sources

Gemini Near Infrared Spectrograph−Distant Quasar Survey: Rest-frame Ultraviolet−Optical Spectral Properties of Broad Absorption Line Quasars

The Astrophysical Journal
We present the rest-frame ultraviolet−optical spectral properties of 65 broad absorption line (BAL) quasars from the Gemini Near Infrared Spectrograph−Distant Quasar Survey (GNIRS-DQS). These properties are compared with those of 195 non-BAL quasars from
Harum Ahmed, Ohad Shemmer, Brandon Matthews, Cooper Dix, Trung Ha, Gordon T. Richards, Michael S. Brotherton, Adam D. Myers, W. N. Brandt, Sarah C. Gallagher, Richard Green, Paulina Lira, Jacob N. McLane, Richard M. Plotkin, Donald P. Schneider   +14 more
doaj   +1 more source

Microlensing of Broad Absorption Line Quasars: Polarization Variability

Publications of the Astronomical Society of the Pacific, 2000
17 pages, 3 figures, accepted to ...
Belle, Kunegunda E., Lewis, Geraint F.
openaire   +2 more sources

THE LONG-TERM X-RAY VARIABILITY OF BROAD ABSORPTION LINE QUASARS [PDF]

The Astrophysical Journal, 2012
We analyze the long-term (rest-frame 3-30 yr) X-Ray variability of eleven broad absorption line (BAL) quasars, mainly to constrain the variation properties of the X-Ray absorbing shielding gas that is thought to play a critical role in BAL wind launching. Our BAL quasar sample has coverage with multiple X-ray observatories including Chandra, XMM-Newton,
Saez, C., Brandt, W. N., Gallagher, S. C., Bauer, F. E., Garmire, G. P.   +4 more
openaire   +7 more sources

Massive Extremely High-velocity Outflow in the Quasar J164653.72+243942.2

The Astrophysical Journal
We present analysis of one of the most extreme quasar outflows found to date in our survey of extremely high-velocity outflows (EHVOs). J164653.72+243942.2 ( z _em  ∼ 3.04) shows variable C iv λλ 1548,1551 absorption at speeds larger than 0.1 c ...
Paola Rodríguez Hidalgo, Hyunseop Choi, Patrick B. Hall, Karen M. Leighly, Liliana Flores, Mikel M. Charles, Cora DeFrancesco, Julie Hlavacek-Larrondo, Laurence Perreault-Levasseur   +8 more
doaj   +1 more source

Microlensing in H1413+117 : disentangling line profile emission and absorption in a broad absorption line quasar

, 2010
On the basis of 16 years of spectroscopic observations of the four components of the gravitationally lensed broad absorption line (BAL) quasar H1413+117, covering the ultraviolet to visible rest-frame spectral range, we analyze the spectral differences ...
Angonin, Anguita, Anguita, B. Borguet, Barlow, Barlow, Becker, Belle, Bjorkman, Borguet, Borguet, Bradford, Chae, Chae, Chantry, Chelouche, Corbin, D. Hutsemékers, D. Sluse, Eigenbrod, Furlanetto, Gallagher, Gibson, Goicoechea, Goodrich, Goodrich, Hamann, Hutsemékers, Hutsemékers, Hutsemékers, Hutsemékers, Kayser, Kneib, Kuraszkiewicz, Lamy, Lewis, Lewis, Lutz, MacLeod, Magain, Magain, Markwardt, McIntosh, Monier, Murray, Nestor, Ogle, P. Riaud, Pei, Poindexter, Proga, Reichard, Remy, Richards, Saha, Scannapieco, Scannapieco, Schmidt, Schramm, Shakura, Silk, Sluse, Sluse, Surdej, T. Anguita, Turnshek, Turnshek, Voit, Weymann, Witt, Young, Zhou, Østensen   +72 more
core   +1 more source

FR II Broad Absorption Line Quasars and the Life Cycle of Quasars [PDF]

The Astrophysical Journal, 2006
By combining the Sloan Digitized Sky Survey Third Data Release quasar list with the VLA FIRST survey, we have identified five objects having both broad absorption lines in their optical spectra and FR-II radio morphologies. We identify an additional example of this class from the FIRST Bright Quasar Survey, J1408+3054.
Gregg, M D, Becker, R H, de Vries, W
openaire   +1 more source