Results 51 to 60 of about 112,522 (249)

Predicting the Yields of z > 6.5 Quasar Surveys in the Era of Roman and Rubin

The Astrophysical Journal, 2023
About 70 luminous quasars discovered at z > 6.5 are strongly biased toward the bright end, thus not providing a comprehensive view of quasar abundance beyond the cosmic dawn. We present the predicted results of the Roman/Rubin high-redshift quasar survey,
Wei Leong Tee, Xiaohui Fan, Feige Wang, Jinyi Yang, Sangeeta Malhotra, James E. Rhoads   +5 more
doaj   +1 more source

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

Clustering Analyses of 300,000 Photometrically Classified Quasars--II. The Excess on Very Small Scales [PDF]

, 2006
We study quasar clustering on small scales, modeling clustering amplitudes using halo-driven dark matter descriptions. From 91 pairs on scales 2, than at z < 2, at the $2.0\sigma$ level.
Adam D. Myers, Donald P. Schneider, Gordon T. Richards, Kormendy J., Neta A. Bahcall, Richstone D., Robert C. Nichol, Robert J. Brunner, Silk J.   +8 more
core   +2 more sources

The Sloan Digital Sky Survey Quasar Catalog: Fourteenth data release [PDF]

, 2017
OCEVU Labex by the "Investissements d'Avenir" French government [ANR-11-LABX-0060]; A*MIDEX project by the "Investissements d'Avenir" French government [ANR-11-IDEX-0001-02]; Agence Nationale de la Recherche [ANR-16-CE31-0021]; Leverhulme Trust Early ...
I. Pâris, P. Petitjean, E. Aubourg, A. Myers, A. Streblyanska, B. Lyke, F. Scott, Anderson, E. Armengaud, J. Bautista, M. Blanton, M. Blomqvist, J. Brinkmann, J. Brownstein, W. Brandt, É. Burtin, K. Dawson, S. D. Torre, Antonis, Georgakakis, H. Gil-Marín, P. Green, P. Hall, J. Kneib, S. LaMassa, J. L. Go, C. MacLeod, V. Mariappan, I. McGreer, A. Merloni, Pasquier, Noterdaeme, N. Palanque-Delabrouille, W. Percival, A. Ross, G. Rossi, P. Donald, Schneider, H. Seo, R. Tojeiro, B. Weaver, A. Weijmans, C. Yéche, P. Zarrouk, Gong-Bo Zhao   +44 more
semanticscholar   +1 more source

Spatially resolved rotation of the broad-line region of a quasar at sub-parsec scale [PDF]

Nature, 2018
The broadening of atomic emission lines by high-velocity motion of gas near accreting supermassive black holes is an observational hallmark of quasars1.
G. Collaboration
semanticscholar   +1 more source

Statistics of Galactic-scale Quasar Pairs at Cosmic Noon

The Astrophysical Journal, 2023
The statistics of galactic-scale quasar pairs can elucidate our understanding of the dynamical evolution of supermassive black hole (SMBH) pairs, the duty cycles of quasar activity in mergers, or even the nature of dark matter, but they have been ...
Yue Shen, Hsiang-Chih Hwang, Masamune Oguri, Nianyi Chen, Tiziana Di Matteo, Yueying Ni, Simeon Bird, Nadia Zakamska, Xin Liu, Yu-Ching Chen, Kaitlin M. Kratter   +10 more
doaj   +1 more source

Imprints of the super-Eddington accretion on the quasar clustering

, 2017
Super-Eddington mass accretion has been suggested as an efficient mechanism to grow supermassive black holes (SMBHs). We investigate the imprint left by the radiative efficiency of the super-Eddington accretion process on the clustering of quasars using ...
Enoki, Motohiro, Ishiyama, Tomoaki, Kobayashi, Masakazu A. R., Makiya, Ryu, Nagashima, Masahiro, Okamoto, Takashi, Oogi, Taira, Shirakata, Hikari   +7 more
core   +1 more source

Quasar clustering: evidence for an increase with redshift and implications for the nature of AGNs [PDF]

, 1997
The evolution of quasar clustering is investigated with a new sample of 388 quasars with 0 ...
Bellenger R., Boyle B. J., Boyle B. J., Carrera F. J., Cavaliere A., Cristiani S., Croom S. M., Fabio La Franca, Franceschini A., Georgantopoulos I., Komberg B. V., Matarrese S., Paola Andreani, Shanks T., Shaver P. A., Soltan A., Stefano Cristiani, Zitelli V.   +17 more
core   +3 more sources

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XIII: Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231 [PDF]

, 2013
We present the results from nine years of optically monitoring the gravitationally lensed z=0.658 quasar RX J1131-1231. The R-band light curves of the four individual images of the quasar were obtained using deconvolution photometry for a total of 707 ...
A. M. Mosquera, Bar-Kana, Bertin, Blandford, Burud, Burud, C. S. Kochanek, Chang, Chantry, Chartas, Chartas, Courbin, D. Sluse, D. Vörös, Dai, E. Eulaers, Eigenbrod, F. Courbin, Fassnacht, Fohlmeister, Fohlmeister, G. Cataldi, G. Meylan, H. Van Winckel, Hjorth, Jakobsson, Keeton, Kochanek, Kochanek, Kundic, Linder, M. Tewes, MacLeod, Magain, Morgan, Morgan, Morgan, Morgan, Mosquera, Myers, N. Cantale, P. Magain, Pelt, Press, Refsdal, S. Dye, Saha, Schild, Schmidt, Sluse, Sluse, Sluse, Sluse, Suyu, Suyu, Suyu, Tewes, van Dokkum, Vanderriest, Vuissoz, Vuissoz, Wyrzykowski   +61 more
core   +2 more sources

Intervista a Mauro Folci

Philosophy Kitchen, 2021
Intervista a Mauro ...
Mauro Folci, Stefano Oliva, Guido Baggio
doaj   +1 more source