Results 111 to 120 of about 515 (214)

A survey for large-separation lensed FIRST quasars - II. Magnification bias and redshift distribution [PDF]

, 2002
The statistics of large-separation gravitational lensing are a powerful tool for probing mass distributions on the scale of galaxy clusters. In this paper we refine the analysis of our survey for large-separation (>5 arcsec) lensed FIRST ...
Prada, Francisco, Ofek, Eran O., Maoz, Dan, Rix, Hans-Walter   +3 more
core  

Coherence of Supermassive Black Hole Binary Demographics with the nHz Stochastic Gravitational-wave Background

The Astrophysical Journal
We present a refined estimation of the stochastic gravitational-wave background (SGWB) based on observed dual active galactic nuclei (AGNs) together with AGN X-ray luminosity functions, in light of recent Pulsar Timing Array (PTA) detections of an nHz ...
Katsunori Kusakabe, Yoshiyuki Inoue, Daisuke Toyouchi   +2 more
doaj   +1 more source

VODKA-JWST: A 3.8 kpc Dual Quasar at Cosmic Noon in a Powerful Starburst Galaxy with JWST/MIRI Integral Field Unit

The Astrophysical Journal
Dual quasars—two active supermassive black holes at galactic scales—represent crucial objects for studying the impact of galaxy mergers and quasar activity on the star formation rate (SFR) within their host galaxies, particularly at cosmic noon when SFR ...
Yu-Ching Chen, Yuzo Ishikawa, Nadia L. Zakamska, Xin Liu, Yue Shen, Hsiang-Chih Hwang, David Rupke, Andrey Vayner, Arran C. Gross, Weizhe Liu, Dominika Wylezalek, Sylvain Veilleux, Caroline Bertemes, Nadiia Diachenko, Swetha Sankar   +14 more
doaj   +1 more source

The time-delay of the gravitationally lensed double quasar UM 673

, 2008
This paper has been ...
Akhunov, T. A., Schmidt, R. W., Burkhonov, O., Gaynullina, E. R., Gottloeber, S., Mirtadjieva, K., Nuritdinov, S. N., Tadjibaev, I., Wambsganss, J., Wisotzki, L., Bruevich, V. V., Gusev, A. S., Sergeyev, A., Smirnov, G.   +13 more
openaire   +2 more sources

VODKA-JWST: Synchronized Growth of Two Supermassive Black Holes in a Massive Gas Disk? A 3.8 kpc Separation Dual Quasar at Cosmic Noon with the NIRSpec Integral Field Unit

The Astrophysical Journal
The search for dual supermassive black holes (SMBHs) is of immense interest in modern astrophysics. Galaxy mergers may fuel and produce SMBH pairs. Actively accreting SMBH pairs are observed as dual quasars, which are vital probes of SMBH growth.
Yuzo Ishikawa, Nadia L. Zakamska, Yue Shen, Xin Liu, Yu-Ching Chen, Hsiang-Chih Hwang, Andrey Vayner, David S. N. Rupke, Sylvain Veilleux, Dominika Wylezalek, Arran C. Gross, Swetha Sankar, Nadiia Diachenko   +12 more
doaj   +1 more source

Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs. [PDF]

Sci Adv, 2022
He Z, Liu G, Wang T, Mou G, Green R, Bian W, Wang H, Ho LC, Sun M, Shen L, Arav N, Chen C, Wu Q, Guo H, Lin Z, Li J, Yi W.   +16 more
europepmc   +1 more source

Radio Counterparts of Ultraluminous X-Ray Sources in Nearby Galaxies

The Astrophysical Journal
Radio surveys of ultraluminous X-ray sources (ULXs) allow us to find supercritically accreting compact objects (SS 433/W50-like systems) or stripped nuclear black holes in nearby galaxies. We identified 21 such objects by crossmatching a ULX catalog with
Yijia Zhang, Hua Feng, Ailing Wang, Roberto Soria   +3 more
doaj   +1 more source

Characterising the host galaxies of type II quasars [PDF]

, 2014
AGN are thought to play an essential role in the evolution of galaxies. Despite this, the means by which the nuclear activity is triggered remains a matter of much debate.
Bessiere, Patricia
core  

A Massive Protocluster Anchored by a Luminous Quasar at z = 6.63

The Astrophysical Journal Letters
Protoclusters, the progenitors of galaxy clusters, trace large scale structures in the early Universe and are important to our understanding of structure formation and galaxy evolution. To date, only a handful of protoclusters have been identified in the
Feige Wang, Jinyi Yang, Joseph F. Hennawi, Xiaohui Fan, Minghao Yue, Eduardo Bañados, Shane Bechtel, Fuyan Bian, Sarah Bosman, Jaclyn B. Champagne, Frederick B. Davies, Roberto Decarli, Emanuele Paolo Farina, Chiara Mazzucchelli, Bram Venemans, Fabian Walter   +15 more
doaj   +1 more source

Limits on MACHOs from microlensing in the double quasar Q0957+561

, 1998
10 pages, 4 figures, accepted by Astronomy & ...
Schmidt, Robert, Wambsganss, Joachim
openaire   +2 more sources