Results 111 to 120 of about 94,086 (264)

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

The Study of the Circumgalactic Medium with Quasar Pairs

The Astrophysical Journal Supplement Series, 2023
We have collected 10,025 foreground–background quasar pairs with projected distances d _p < 500 kpc from the large quasar catalog of the Sloan Digital Sky Survey DR16Q. We investigate the properties of the Mg ii absorption lines with W _r > 0.15 Å around
Zhi-Fu Chen, Huan-Chang Qin, Jin-Ting Cai, Yu-Tao Zhou, Zhe-Geng Chen, Ting-Ting Pang, Zhi-Wen Wang, Kang-Fa Cheng   +7 more
doaj   +1 more source

A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies. I. Galaxy Mergers and Quasar Activity [PDF]

, 2007
We develop a model for the cosmological role of mergers in the evolution of starbursts, quasars, and spheroidal galaxies. By combining theoretically well-constrained halo and subhalo mass functions as a function of redshift and environment with empirical
P. Hopkins, L. Hernquist, T. J. Cox, D. Keres̆   +3 more
semanticscholar   +1 more source

A multi-wavelength survey of AGN in the XMM-LSS field, I : quasar selection via the KX technique [PDF]

, 2008
Aims. We present a sample of candidate quasars selected using the KX-technique. The data cover 0.68 deg(2) of the X-ray Multi-Mirror (XMM) Large-Scale Structure (LSS) survey area where overlapping multi-wavelength imaging data permits an investigation of
Th. Nakos, J. P. Willis, S. Andreon, J. Surdej, P. Riaud, E. Hatziminaoglou, O. Garcet, D. Alloin, M. Baes, G. Galaz, M. Pierre, H. Quintana, M. J. Page, J. A. Tedds, M. T. Ceballos, A. Corral, J. Ebrero, M. Krumpe, S. Mateos, Andreon, Barkhouse, Benn, Bertin, Bolzonella, Brown, Calzetti, Canalizo, Chen, Chiappetti, Croom, Della Ceca, Fazio, Francis, Garcet, Hall, Hatziminaoglou, Hatziminaoglou, Hewett, Labbé, Leipski, Lewis, Surace, Lonsdale, Maddox, Masci, Monet, Persson, Persson, Pickles, Pierre, Pierre, Polletta, Richards, Richards, Rieke, Sandage, Schmidt, Sharp, Skrutskie, Smith, Strüder, Tajer, Turner, Warren, Webster, Weedman, Whiting   +66 more
core   +3 more sources

Flame Retardant Polyolefins Using Fibers From Leather Waste: Adjusting Extrusion Variables to Balance the Property Profile

Journal of Vinyl and Additive Technology, Volume 32, Issue 2, Page 410-430, March 2026.
Adjusting extrusion variables are a key to balance the flame retardancy and mechanical properties of polyolefin/leather waste fiber composites. ABSTRACT The extrusion processing variables represent a key to the optimal use of additives and thus the development of flame‐retardant polymer composites. Adjusting the property profile, for example, finding a
Guadalupe Sanchez‐Olivares, Sven Brehme, Fausto Calderas, Bernhard Schartel   +3 more
wiley   +1 more source

The Physical Properties of Low-redshift FeLoBAL Quasars. IV. Optical–Near-IR Spectral Energy Distributions and Near-IR Variability Properties

The Astrophysical Journal
We present the optical–near-infrared spectral energy distributions (SED) and near-infrared variability properties of 30 low-redshift iron low-ionization Broad Absorption Line quasars (FeLoBALQs) and matched samples of LoBALQs and unabsorbed quasars ...
Karen M. Leighly, Hyunseop Choi, Michael Eracleous, Donald M. Terndrup, Sarah C. Gallagher, Gordon T. Richards   +5 more
doaj   +1 more source

Quasars at 25

Science, 1986
In the quarter century since the first optical identification of a "radio star" (3C 48), astronomers have come to general agreement that the underlying quasar energy source is accretion onto a massive black hole. There is much less agreement on the detailed physics of the processes by which this energy is converted to the forms observed, but this has ...
Trimble, Virginia, Woltjer, Lodewijk
openaire   +4 more sources

Characterization of the Nature of Organic Matter in Carbonate Rocks: Implications for Geological and Environmental Studies

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 3, March 2026.
Abstract Organic matter in carbonate rocks plays a crucial role in processes such as fluid flow regulation, carbon sequestration, contaminant transport, and hydrocarbon recovery. This study employed multimodal spectroscopic techniques, including fluorescence imaging and Fourier transform infrared (FTIR) spectroscopy, to characterize the spatial ...
Alicia Moya, Rajkumar Chowdhury, Yves Perrette, Fabienne Giraud, Laurent Charlet, Christophe Sandt, Hugo Chauvet, Frederic Jamme, Alexander Van Driessche, Alejandro Fernandez‐Martinez   +9 more
wiley   +1 more source

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 quasars and luminous galaxies at 5.7 < z ≤ 6.8 [PDF]

, 2017
We present spectroscopic identification of 32 new quasars and luminous galaxies discovered at 5 ...
Y. Matsuoka, M. Onoue, N. Kashikawa, K. Iwasawa, M. Strauss, T. Nagao, M. Imanishi, Chien-Hsiu Lee, M. Akiyama, N. Asami, J. Bosch, S. Foucaud, H. Furusawa, T. Goto, J. Gunn, Y. Harikane, H. Ikeda, T. Izumi, T. Kawaguchi, S. Kikuta, K. Kohno, Y. Komiyama, R. Lupton, T. Minezaki, S. Miyazaki, T. Morokuma, Hitoshi Murayama, M. Niida, A. Nishizawa, M. Oguri, Y. Ono, M. Ouchi, P. Price, H. Sameshima, A. Schulze, H. Shirakata, J. Silverman, N. Sugiyama, Philip J. Tait, M. Takada, T. Takata, Masayuki Tanaka, Ji-Jia Tang, Y. Toba, Y. Utsumi, Shiang‐Yu Wang   +45 more
semanticscholar   +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