Results 171 to 180 of about 117,210 (326)

SUBARU HIGH-z EXPLORATION OF LOW-LUMINOSITY QUASARS (SHELLQs). I. DISCOVERY OF 15 QUASARS AND BRIGHT GALAXIES AT 5.7 < z < 6.9 [PDF]

, 2016
We report the discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9. This is the initial result from the Subaru High-z Exploration of Low-Luminosity Quasars project, which exploits the exquisite multiband imaging data produced by the Subaru Hyper ...
Y. Matsuoka, M. Onoue, N. Kashikawa, K. Iwasawa, M. Strauss, T. Nagao, M. Imanishi, M. Niida, Y. Toba, M. Akiyama, N. Asami, J. Bosch, S. Foucaud, H. Furusawa, T. Goto, J. Gunn, Y. Harikane, H. Ikeda, T. Kawaguchi, S. Kikuta, Y. Komiyama, R. Lupton, T. Minezaki, S. Miyazaki, T. Morokuma, H. Murayama, A. Nishizawa, Y. Ono, M. Ouchi, P. Price, H. Sameshima, J. Silverman, N. Sugiyama, Philip J. Tait, M. Takada, T. Takata, Masayuki Tanaka, Ji-Jia Tang, Y. Utsumi   +38 more
semanticscholar   +1 more source

COSMIC REIONIZATION AFTER PLANCK: COULD QUASARS DO IT ALL? [PDF]

, 2015
We assess a model of late cosmic reionization in which the ionizing background radiation arises entirely from high-redshift quasars and other active galactic nuclei (AGNs).
P. Madau, F. Haardt
semanticscholar   +1 more source

Comment on "Biases in the Quasar Mass-Luminosity Plane" [PDF]

arXiv, 2010
Comment on "Biases in the Quasar Mass-Luminosity Plane"
arxiv  

Quasars in the 2MASS Second Incremental Data Release

, 2001
Using the 2MASS Second Incremental Data Release, we have searched for near infrared counterparts to 13214 quasars from the Veron-Cetty & Veron(2000) catalog.
Baker J., Francis P., Nelson B., Patrick B. Hall, Smith P. S., Veron-Cetty M. P., Wayne A. Barkhouse   +6 more
core   +3 more sources

The Race Between Stars and Quasars in Reionizing Cosmic Hydrogen

, 2009
The cosmological background of ionizing radiation has been dominated by quasars once the Universe aged by ~2 billion years. At earlier times (redshifts z>3), the observed abundance of bright quasars declined sharply, implying that cosmic hydrogen was ...
A. Loeb, A. Loeb, A. Soltan, A.S. Eddington, Abraham Loeb, C.-L. Jiao, C.A. Faucher-Giguère, C.W. Morgan, F. Shankar, F. Shankar, I.D. Novikov, J. Magorrian ., J. Silk, J.A. Kollmeier ., J.L. Tinker ., J.S.B. Wyithe, J.S.B. Wyithe, J.S.B. Wyithe, J.S.B. Wyithe, K. Gebhardt ., L. Ferrarese, M. Dijkstra, M. Dijkstra, M.S. Warren, N. Haring, N.I. Shakura, P.F. Hopkins, R. Shafee, R. Shafee ., R.C. Kennicutt, R.C. Telfer, R.L. White, R.M. O'Leary, R.M. O'Leary, S. Poindexter, S. Tremaine ., S. Tremaine ., S. Wyithe, T. Tanaka, T.R. Lauer ., V. Bromm, WMAP collaboration, Y. Li ., Z. Haiman, Z. Haiman   +44 more
core   +1 more source

The Low-Mass End of the MBH/Mhost Relation in Quasars

Advances in Astronomy, 2012
The MBH-Mhost relation in quasars has been probed only in a limited parameter space, namely, at MBH∼109 M⊙ and Mhost∼1012  M⊙. Here we present a study of 26 quasars laying in the low-mass end of the relation, down to MBH∼107 M⊙.
Roberto Decarli, Renato Falomo, Jari K. Kotilainen, Tomi Hyvönen, Michela Uslenghi, Aldo Treves   +5 more
doaj   +1 more source

The LAMOST Survey of Background Quasars in the Vicinity of the Andromeda and Triangulum Galaxies -- II. Results from the Commissioning Observations and the Pilot Surveys

, 2013
We present new quasars discovered in the vicinity of the Andromeda and Triangulum galaxies with the LAMOST during the 2010 and 2011 observational seasons.
Bai, Zhong-Rui, Chen, Jian-Jun, Chen, Xiao-Yan, Chu, Jia-Ru, Chu, Yao-Quan, Cui, Xiang-Qun, Du, Bing, Hou, Yong-Hui, Hu, Hong-Zhuan, Hu, Zhong-Wen, Huang, Yang, Huo, Zhi-Ying, Jia, Lei, Jiang, Fang-Hua, Lei, Ya-Juan, Li, Ai-Hua, Li, Guang-Wei, Li, Guo-Ping, Li, Jian, Li, Xin-Nan, Li, Yan, Li, Ye-Ping, Liu, Gen-Rong, Liu, Xiao-Wei, Liu, Zhi-Gang, Lu, Qi-Shuai, Luo, A-Li, Luo, Yu, Men, Li, Ni, Ji-Jun, Qi, Yong-Jun, Qi, Zhao-Xiang, Shi, Huo-Ming, Shi, Jian-Rong, Sun, Shi-Wei, Tang, Zheng-Hong, Tian, Yuan, Tu, Liang-Ping, Wang, Dan, Wang, Feng-Fei, Wang, Gang, Wang, Jia-Ning, Wang, Lei, Wang, Shu-Qing, Wang, You, Wang, Yue-Fei, Wei, Ming-Zhi, Wu, Yue, Xiang, Mao-Sheng, Xue, Xiang-Xiang, Yan, Lin, Yao, Zheng-Qiu, Yu, Yong, Yuan, Hai-Bo, Yuan, Hui, Zhai, Chao, Zhang, En-Peng, Zhang, Hao-Tong, Zhang, Hui-Hua, Zhang, Jian-Nan, Zhang, Wei, Zhang, Yan-Xia, Zhang, Yong, Zhang, Zhen-Chao, Zhao, Gang, Zhao, Ming, Zhao, Yong-Heng, Zhou, Fang, Zhou, Xin-Lin, Zhu, Yong-Tian, Zou, Si-Cheng   +70 more
core   +1 more source

The Detection Rate of Associated Mg ii Absorption Lines in Quasars Depends on Their Radio Emission

The Astrophysical Journal
In active galactic nuclei, jet-driven feedback plays a significant role in influencing the properties of gas within their host galaxy and the circumgalactic medium.
Zhi-Fu Chen, Luis C. Ho
doaj   +1 more source

Polarization of Quasars [PDF]

Symposium - International Astronomical Union, 1972
I report here work done at Jodrell Bank by Mr John Gilbert and myself at a wavelength of 49 cm, on the degree of linear polarization, m49. For most sources the polarization is considerably reduced from its short wavelength value. We presume that most of this depolarization is by Faraday rotation, or rather by Faraday dispersion, between different parts
openaire   +2 more sources

Reliable Identification of Binary Supermassive Black Holes from Rubin Observatory Time-domain Monitoring

The Astrophysical Journal
Periodic signatures in time-domain observations of quasars have been used to search for binary supermassive black holes (SMBHs). These searches, across existing time-domain surveys, have produced several hundred candidates.
Megan C. Davis, Kaylee E. Grace, Jonathan R. Trump, Jessie C. Runnoe, Amelia Henkel, Laura Blecha, W. N. Brandt, J. Andrew Casey-Clyde, Maria Charisi, Caitlin A. Witt   +9 more
doaj   +1 more source