Results 111 to 120 of about 91,098 (240)

The Evolution of Quasars at High Redshift and Their Connection with Galaxies [PDF]

arXiv, 1998
I review recent observations on the evolution of quasars, describe new surveys for quasars at z > 5 and for quasars at z > 3.3 down to luminosities corresponding to L* galaxies, and note the possible connection between the evolution of the star formation rate in young galaxies and the evolution of quasars.
arxiv  

Luminous and Obscured Quasars and Their Host Galaxies

Frontiers in Astronomy and Space Sciences, 2018
The most heavily-obscured, luminous quasars might represent a specific phase of the evolution of the actively accreting supermassive black holes and their host galaxies, possibly related to mergers.
Agnese Del Moro, David M. Alexander, Franz E. Bauer, Franz E. Bauer, Franz E. Bauer, Franz E. Bauer, Emanuele Daddi, Dale D. Kocevski, Flora Stanley, Daniel H. McIntosh   +9 more
doaj   +1 more source

The Magnetodynamic Model of Quasars [PDF]

, 1968
L. M. Ozernoj
openalex   +1 more source

WFPC2 Imaging of Quasar Environments: A Comparison of LBQS and HST Archive Quasars [PDF]

arXiv, 2001
We present Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) data on the large-scale environments of 16 0.39 < z < 0.51 quasars from the Large Bright Quasar Survey (LBQS). The LBQS quasars are representative of the radio-quiet population, and this is the first look at their large-scale environments.
arxiv  

Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]

Sci Adv, 2023
Shen L, Liu G, He Z, Zakamska NL, Glikman E, Greene JE, Hu W, Mou G, Wylezalek D, Rupke DSN.   +9 more
europepmc   +1 more source

Extreme Variability Quasars in Their Various States. II. Spectral Variation Revealed with Multiepoch Spectra

The Astrophysical Journal
We 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, Junxian Wang, Zhenyi Cai, Xufan Hu   +3 more
doaj   +1 more source

Lightning, Novae and Quasars [PDF]

, 1966
C.E.R. Bruce
openalex   +1 more source

How the BAL quasars are quiet [PDF]

arXiv, 2002
All properties of the quasars known by the author (quietness of the BAL quasars, Lyman forest, iron in the high-z quasars...) are explained supposing that the kernel of the quasar is surrounded by a halo containing an accretion disk and magnetic satellites (no dark matter or fast jet, no variation of the fine structure constant, no strange source of ...
arxiv  

Prospects for Observing High-redshift Radio-loud Quasars in the SKA Era: Paving the Way for 21 cm Forest Observations

The Astrophysical Journal
The 21 cm forest is a sensitive probe for the early heating process and small-scale structures during the epoch of reionization (EOR), to be realized with the upcoming Square Kilometre Array (SKA). Its detection relies on the availability of radio-bright
Qi Niu, Yichao Li, Yidong Xu, Hong Guo, Xin Zhang   +4 more
doaj   +1 more source

Quasars, Anti-matter and Optical Asymmetry [PDF]

, 1966
T. L. V. Ulbricht
openalex   +1 more source