Results 101 to 110 of about 91,098 (240)

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

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

Hunting the Quasar [PDF]

, 1967

openalex   +1 more source

Luminous Quasars Do Not Live in the Most Overdense Regions of Galaxies at z~4

, 2017
We present the cross-correlation between 151 luminous quasars ($M_{ \mathrm{UV}} < -26$) and 179 protocluster candidates at $z \sim 3.8$, extracted from the Wide imaging survey ($ \sim 121~ $deg$^2$) performed with a part of the Hyper Suprime-Cam Subaru ...
Akiyama, Masayuki, Chiang, Yi-Kuan, Coupon, Jean, Harikane, Yuichi, Ichikawa, Kohei, Imanishi, Masatoshi, Ishikawa, Shogo, Kashikawa, Nobunari, Kodama, Tadayuki, Komiyama, Yutaka, Lee, Chien-Hsiu, Lin, Yen-Ting, Marinello, Murilo, Miyazaki, Satoshi, Nagao, Tohru, Niino, Yuu, Nishizawa, Atushi J., Ono, Yoshiaki, Onoue, Masafusa, Ouchi, Masami, Overzier, Roderik, Tanaka, Masayuki, Toshikawa, Jun, Uchiyama, Hisakazu, Wang, Shiang-Yu   +24 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 Formation of Stars with Particular Application to Temporary Stars and Quasars [PDF]

, 1969
I. P. Williams
openalex   +1 more source

Spectral energy distributions of quasars selected in the mid-infrared

, 2012
We present preliminary results on fitting of SEDs to 142 z>1 quasars selected in the mid-infrared. Our quasar selection finds objects ranging in extinction from highly obscured, type-2 quasars, through more lightly reddened type-1 quasars and normal type-
A. O. Petric, A. Sajina, D. Farrah, D. M. Nielsen, E. L. Gates, M. Lacy, S. E. Ridgway, T. Urrutia   +7 more
core   +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

Radio Galaxies and Quasars, I [PDF]

, 1968
M. Ryle
openalex   +1 more source

Infrared properties of serendipitous X-ray quasars [PDF]

, 1982
Near infrared measurements were obtained of 30 quasars originally found serendipitously as X-ray sources in fields of other objects. The observations show that the infrared characteristics of these quasars do not differ significantly from those of ...
Chanan, G. A., Margon, B., Matthews, K., Neugebauer, G., Soifer, B. T.   +4 more
core   +1 more source