Results 191 to 200 of about 117,210 (326)
Nature Astronomy, 2018 For consistency with Nature policy, the version posted here is the text as submitted to Nature Astronomy in November 2017. The final version is available at the DOI below, and differs slightly in wording.
openaire +5 more sources
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
The Formation of Stars with Particular Application to Temporary Stars and Quasars [PDF]
, 1969 I. P. Williams
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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
doaj +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
Optimal distribution of VLBI transmitters in the Galileo space segment for frame ties. [PDF]
Earth Planets Space, 2023 Wolf H, Böhm J.
europepmc +1 more source
The Astrophysical JournalThe 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 +4 more
doaj +1 more source
Red Type-1 Quasars after Cosmic Noon and Impact on $L_{\rm UV}$-related Quasar Statistics [PDF]
arXivOver the past decades, nearly a million quasars have been explored to shed light on the evolution of supermassive black holes and galaxies. The ultraviolet-to-optical spectra of type-1 quasars particularly offer insights into their black hole activities.
arxiv