Results 61 to 70 of about 113,643 (296)

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

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

Intervista a Mauro Folci

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

Modeling the HeII Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration

, 2017
The HeII transverse proximity effect - enhanced HeII Ly{\alpha} transmission in a background sightline caused by the ionizing radiation of a foreground quasar - offers a unique opportunity to probe the emission properties of quasars, in particular the ...
Davies, Frederick B., Hennawi, Joseph F., Lukić, Zarija, Oñorbe, Jose, Schmidt, Tobias M., Worseck, Gábor   +5 more
core   +1 more source

Monitoring and quantifying of water turbidity in the Albufera of Valencia during the 2024 flood using a machine learning model

Cuadernos de Geografía de la Universitat de València
Monitoring turbidity during flood events is vital for assessing the extent of water contamination, understanding sediment transport dynamics, and guiding emergency response efforts to mitigate ecological damage and health risks. In this study, we aim to
Masuma Chowdhury, Ana Belén Ruescas Orient, Ignacio De la Calle, Irene Laiz   +3 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

SDSS J094604.90+183541.8: A Gravitationally Lensed Quasar at z=4.8

, 2010
We report the discovery of a gravitationally lensed quasar identified serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS J094604.90+183541.8, was initially targeted for spectroscopy as a luminous red galaxy, but the SDSS spectrum ...
Abazajian, Bolton, Carilli, Comerford, Donald P. Schneider, Eisenstein, Fuyan Bian, Gunn, Hall, Ian D. McGreer, Inada, Inada, Ivezic, Johnston, Kara Farnsworth, Kayo, Keeton, Keeton, Kochanek, Kozłowski, Lupton, Lupton, Masamune Oguri, McMahon, Michael A. Strauss, Naohisa Inada, Oguri, Oguri, Oguri, Patrick B. Hall, Peng, Peng, Pier, Pindor, Refsdal, Richards, Richards, Richards, Richards, Richards, Riechers, Schlegel, Schmidt, Schneider, Smith, Stoughton, Wyithe, Xiaohui Fan, York   +48 more
core   +1 more source

A CATALOG OF QUASAR PROPERTIES FROM SLOAN DIGITAL SKY SURVEY DATA RELEASE 7 [PDF]

, 2010
We present a compilation of properties of the 105,783 quasars in the Sloan Digital Sky Survey Data Release 7 (DR7) quasar catalog. In this product, we compile continuum and emission line measurements around the Hα, Hβ, Mg ii, and C iv regions, as well as
Yue Shen, G. Richards, M. Strauss, P. Hall, D. Schneider, S. Snedden, D. Bizyaev, H. Brewington, V. Malanushenko, E. Malanushenko, D. Oravetz, K. Pan, A. Simmons   +12 more
semanticscholar   +1 more source

The Subaru high-z quasar survey: discovery of faint z~6 quasars

, 2014
We present the discovery of one or two extremely faint z~6 quasars in 6.5 deg^2 utilizing a unique capability of the wide-field imaging of the Subaru/Suprime-Cam.
Furusawa, Hisanori, Hibon, Pascale, Im, Myungshin, Ishikawa, Shogo, Ishizaki, Yoshifumi, Kashikawa, Nobunari, Niino, Yuu, Onoue, Masafusa, Ouchi, Masami, Shimasaku, Kazuhiro, Toshikawa, Jun, Willott, Chris J.   +11 more
core   +1 more source

Microlensing variability in the gravitationally lensed quasar Q2237+0305 = the Einstein Cross, I. Spectrophotometric monitoring with the VLT [PDF]

, 2008
We present the results of the first long-term (2.2 years) spectroscopic monitoring of a gravitationally lensed quasar, namely the Einstein Cross Q2237+0305.
A. Eigenbrod, Abajas, Agol, Agol, Burud, Burud, Burud, Cardelli, Chartas, Colley, Courbin, D. Sluse, Dietrich, E. Agol, Eigenbrod, Eigenbrod, Eigenbrod, F. Courbin, Falco, Filippenko, G. Meylan, Gómez-Álvarez, Gómez-Álvarez, Hjorth, Huchra, Irwin, Jakobsson, Kaspi, Keeton, Kent, Kochanek, Kochanek, Koptelova, Lewis, Lewis, Lewis, Magain, Metcalf, Mineshige, Murray, Nemiroff, Richards, Rix, Schechter, Schneider, Schneider, Sluse, Udalski, van Dokkum, Vestergaard, Vuissoz, Wambsganss, Wambsganss, Wandel, Wayth, Wills, Wisotzki, Wisotzki, Witt, Wozniak, Wozniak, Yee, Yonehara   +62 more
core   +2 more sources