Results 181 to 190 of about 117,210 (326)

The Sloan Digital Sky Survey Quasar Lens Search. V. Final Catalog from the Seventh Data Release

, 2012
We present the final statistical sample of lensed quasars from the Sloan Digital Sky Survey (SDSS) Quasar Lens Search (SQLS). The well-defined statistical lens sample consists of 26 lensed quasars brighter than i=19.1 and in the redshift range of 0 ...
Abazajian, Abazajian, Abazajian, Abazajian, Adelman-McCarthy, Adelman-McCarthy, Adelman-McCarthy, Aihara, Auger, Bade, Bernardi, Blanton, Bolton, Bolton, Bowen, Brownstein, Christopher S. Kochanek, Cristian E. Rusu, Doi, Donald G. York, Donald P. Schneider, Eisenstein, Faure, Fukugita, Féron, Goicoechea, Gordon T. Richards, Green, Gregg, Gunn, Gunn, Hagen, Hall, Hennawi, Hennawi, Hogg, Inada, Inada, Inada, Inada, Inada, Inada, Inada, Inada, Inada, Inada, Issha Kayo, Johnston, Joshua A. Frieman, Kashikawa, Kayo, Kayo, Keeton, Kneib, Kochanek, Kochanek, Kochanek, Komatsu, Koopmans, Koopmans, Kubo, Lacki, Lacy, Lubin, Marshall, Masamune Oguri, Masataka Fukugita, McGreer, Michael A. Strauss, Min-Su Shin, More, Morgan, Morgan, Morokuma, Muñoz, Myers, Myers, Myers, Naohisa Inada, Neta A. Bahcall, Oguri, Oguri, Oguri, Oguri, Oguri, Oguri, Oguri, Oguri, Oscoz, Padmanabhan, Paraficz, Patrick B. Hall, Peng, Peng, Pier, Pindor, Pindor, Richard L. White, Richards, Richards, Richards, Ross, Rusin, Rusin, Rusu, Saha, Schechter, Schlegel, Schneider, Smith, Stoughton, Suyu, Tomoki Morokuma, Winn, Yanny, York   +115 more
core   +1 more source

Quasars, Anti-matter and Optical Asymmetry [PDF]

, 1966
T. L. V. Ulbricht
openalex   +1 more source

Unambiguous quasar microlensing [PDF]

Monthly Notices of the Royal Astronomical Society, 1999
Revised version; 5 pages, 4 figures, to appear in ...
openaire   +3 more sources

Quasar candidate selection and photometric redshift estimation based on SDSS and UKIDSS data

, 2010
We present a sample of 8498 quasars with both SDSS $ugriz$ optical and UKIDSS $YJHK$ near-IR photometric data. With this sample, we obtain the median colour-z relations based on 7400 quasars with magnitude uncertainties less than 0.1mag in all bands.
Abazajian, Ball, Boyle, Casali, Chiu, Croom, Croom, D'Abrusco, Fan, Fan, Fan, Hambly, Hewett, Ivezic, Ivezic, Kaiser, Lawrence, Maddox, Maddox, Richards, Richards, Richards, Richards, Richards, Schlegel, Schmidt, Schneider, Sesar, Smith, Su, Tyson, Warren, Weinstein, Wu, Xue-Bing Wu, York, Zhendong Jia   +36 more
core   +1 more source

A Search for Low-energy Gamma-rays from the Quasar 3C286 [PDF]

, 1965
D. J. Adams, R. R. Hillier, A.F. Janes
openalex   +1 more source

Luminous and Obscured Quasars and Their Host Galaxies

Frontiers in Astronomy and Space Sciences, 2018
The most heavily-obscured, luminous quasars might represent a specific phase of the evolution of the actively accreting supermassive black holes and their host galaxies, possibly related to mergers.
Agnese Del Moro, David M. Alexander, Franz E. Bauer, Franz E. Bauer, Franz E. Bauer, Franz E. Bauer, Emanuele Daddi, Dale D. Kocevski, Flora Stanley, Daniel H. McIntosh   +9 more
doaj   +1 more source

Cosmological Significance of the Relation between Red-shift and Flux Density for Quasars [PDF]

, 1966
D. W. Sciama, M. J. Rees
openalex   +1 more source

Environments around Quasars at z ∼ 3 Revealed by Wide-field Imaging with Subaru HSC and CFHT

The Astrophysical Journal
We examine the local density environments around 67 quasars at z ∼ 3 by combining the imaging data of Hyper Suprime-Cam Subaru Strategic Program and Canada–France–Hawaii Telescope Large Area U -band Deep Survey over about 20 deg ^2 .
Yuta Suzuki, Hisakazu Uchiyama, Yoshiki Matsuoka, Jun Toshikawa, Stephen Gwyn, Masatoshi Imanishi, Chengze Liu, Akatoki Noboriguchi, Marcin Sawicki, Yoshiki Toba   +9 more
doaj   +1 more source

Statistical Detection of the He ii Transverse Proximity Effect: Evidence for Sustained Quasar Activity for >25 Million Years

Frontiers in Astronomy and Space Sciences, 2017
The reionization of helium at z ~ 3 is the final phase transition of the intergalactic medium and supposed to be driven purely by quasars. The He ii transverse proximity effect—enhanced He ii transmission in a background sightline caused by the ionizing ...
Tobias M. Schmidt, Tobias M. Schmidt, Gabor Worseck, Joseph F. Hennawi, Joseph F. Hennawi, J. Xavier Prochaska, Neil H. M. Crighton, Zarija Lukić, Jose Oñorbe   +8 more
doaj   +1 more source

The Evolution of Quasars at High Redshift and Their Connection with Galaxies [PDF]

arXiv, 1998
I review recent observations on the evolution of quasars, describe new surveys for quasars at z > 5 and for quasars at z > 3.3 down to luminosities corresponding to L* galaxies, and note the possible connection between the evolution of the star formation rate in young galaxies and the evolution of quasars.
arxiv