Results 141 to 150 of about 111,891 (295)
Quest for a Coherent Definition of Weak-line Quasars and Its Physical Implications
The Astrophysical JournalWeak-line quasars (WLQs) represent a subset of type 1 quasars distinguished by remarkably weak high-ionization broad emission lines, yet exhibiting normal optical/UV continua. This study establishes a physically motivated definition of WLQs using 371,091
Xiaoqiang Cheng, Jianfeng Wu, Qiaoya Wu
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Thermal Emission from Warm Dust in the Most Distant Quasars
, 2008 We report new continuum observations of fourteen z~6 quasars at 250 GHz and fourteen quasars at 1.4 GHz. We summarize all recent millimeter and radio observations of the sample of the thirty-three quasars known with 5 ...
Alain Omont +18 more
core +2 more sources
Some Constraints on Quasar Progenitors and Quasar Evolution [PDF]
Symposium - International Astronomical Union, 1986 There is strong evidence that quasars are powered by the gravitational energy released by in fall of matter into a compact supermassive object which is most likely a black hole with mass M>106 to 109MO. The question then arises as to how such massive black holes came to be formed. What sort of objects were the progenitors?
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Astronomy & Astrophysics, 2018 Winds accelerated by active galactic nuclei (AGNs) are invoked in the most successful models of galaxy evolution to explain the observed physical and evolutionary properties of massive galaxies.
G. Vietri +23 more
semanticscholar +1 more source
Interstellar Scintillation of the Polarized Flux Density in Quasar PKS 0405−385 [PDF]
, 2002 Barney J. Rickett +2 more
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The Astrophysical JournalWe previously built a sample of 14,012 extremely variable quasars (EVQs) based on Sloan Digital Sky Survey (SDSS) and Pan-STARRS1 photometric observations.
Wenke Ren +3 more
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Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
, 2015 We present ALMA observations of two moderate luminosity quasars at redshift 6. These quasars from the Canada-France High-z Quasar Survey (CFHQS) have black hole masses of ~10^8 M_solar.
Bergeron, Jacqueline +2 more
core +2 more sources
LBQS 0103−2753: A 0[farcs]3 Binary Quasar [PDF]
, 2001 V. Junkkarinen +6 more
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Orientation and quasar black hole mass estimation [PDF]
, 2015 M. S. Brotherton +2 more
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On Quasar Masses and Quasar Host Galaxies [PDF]
The Astrophysical Journal, 1998 Accepted for publication in ApJ Letters, 7 pages, aas2pp4 ...
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