Results 111 to 120 of about 85,255 (272)
Prospects of observing a quasar HII region during the Epoch of Reionization with redshifted 21cm
, 2012 We present a study of the impact of a bright quasar on the redshifted 21cm signal during the Epoch of Reionization (EoR). Using three different cosmological radiative transfer simulations, we investigate if quasars are capable of substantially changing ...
Ali +91 more
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Pixellated Lenses and Estimates of H_0 from Time-delay Quasars [PDF]
, 1999 Liliya L. R. Williams, Prasenjit Saha
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On the origin of excess cool gas in quasar host halos
, 2015 Previous observations of quasar host halos at z=2 have uncovered large quantities of cool gas that exceed what is found around inactive galaxies of both lower and higher masses.
Chen, Hsiao-Wen +2 more
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Isolating an Outflow Component in Single-Epoch Spectra of Quasars
, 2022 P. Marziani
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The Quasar Proximity Effect as an Alternative Probe of Quasar Pair Distances
The Astrophysical Journal LettersRecently discovered quasar pairs at high redshifts ( z ≳ 5) are likely precursors to supermassive black hole mergers, providing a promising window to high-redshift quasar growth mechanisms.
Huanqing Chen +2 more
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Frontiers in Astronomy and Space Sciences, 2018 The last 25 years saw a major step forward in the analysis of optical and UV spectroscopic data of large quasar samples. Multivariate statistical approaches have led to the definition of systematic trends in observational properties that are the basis of
Paola Marziani +9 more
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The Spectral Energy Distributions of Quasars and AGN [PDF]
, 2003 B. J. Wilkes
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Estimating the Sunyaev - Zel'dovich signal from quasar hosts using a Halo Occupation Distribution based approach [PDF]
, 2015 Dhruba Dutta Chowdhury
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Measurements of Quasar Proximity Zones with the Lyα Forest of DESI Y1 Quasars
The Astrophysical JournalThe intergalactic medium (IGM) around a quasar is shaped by its dense environment and by its excess ionizing radiation, which form a “quasar proximity zone” whose size and anisotropy depend on the quasar’s halo mass, luminosity, age, and radiation ...
Ryuichiro Hada +43 more
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The associated absorption features in quasar spectra of the Sload Digital Sky survey .I. \MgII\ absorption doublets [PDF]
, 2018 Zhi-Fu, Chen +7 more
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