Results 11 to 20 of about 111,891 (295)
Target Selection and Validation of DESI Quasars [PDF]
The Astrophysical Journal, 2023 The Dark Energy Spectroscopic Instrument (DESI) survey will measure large-scale structures using quasars as direct tracers of dark matter in the redshift range 0.9 < z < 2.1 and using Ly α forests in quasar spectra at z > 2.1.
Edmond Chaussidon +56 more
doaj +2 more sources
Gravitationally lensed quasars in Gaia – IV. 150 new lenses, quasar pairs, and projected quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT We report the spectroscopic follow-up of 175 lensed quasar candidates selected using Gaia Data Release 2 observations following Paper III of this series. Systems include 86 confirmed lensed quasars and a further 17 likely lensed quasars based on imaging and/or similar spectra.
C Lemon +12 more
openaire +5 more sources
Symposium - International Astronomical Union, 1999 I review recent results for quasars and discuss how they are related to activity in galaxies. Topics included are studies of quasar host galaxies with HST; searches for quasars in the Hubble Deep Field; evolution of the quasar luminosity function; news ...
Osmer, Patrick S.
core +4 more sources
EIGER. V. Characterizing the Host Galaxies of Luminous Quasars at z ≳ 6 [PDF]
The Astrophysical Journal, 2023 We report JWST/NIRCam measurements of quasar host galaxy emissions and supermassive black hole (SMBH) masses for six quasars at 5.9 < z < 7.1 in the Emission-line galaxies and Intergalactic Gas in the Epoch of Reionization (EIGER) project. We obtain deep
Minghao Yue +8 more
doaj +2 more sources
Quasars and the Intergalactic Medium at Cosmic Dawn [PDF]
Annual Review of Astronomy and Astrophysics, 2022 Quasars at cosmic dawn provide powerful probes of the formation and growth of the earliest supermassive black holes (SMBHs) in the Universe, their connections to galaxy and structure formation, and the evolution of the intergalactic medium (IGM) at the ...
Xiaohui Fan, E. Bañados, R. Simcoe
semanticscholar +1 more source
Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 7.0 [PDF]
Astrophysical Journal, 2019 We report the discovery of 28 quasars and 7 luminous galaxies at 5.7 ≤ z ≤ 7.0. This is the tenth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the deep multiband imaging data ...
Yoshiki Matsuoka +46 more
openalex +3 more sources
The Million Quasars (Milliquas) Catalogue, v8 [PDF]
The Open Journal of Astrophysics, 2023 Announcing the final release, v8, of the Milliquas (Million Quasars) quasar catalogue which presents all published quasars to 30 June 2023, including quasars from the first releases of the Dark Energy Spectroscopic Instrument (DESI) and the SDSS-DR18 ...
E. Flesch
semanticscholar +1 more source
Probing Early Supermassive Black Hole Growth and Quasar Evolution with Near-infrared Spectroscopy of 37 Reionization-era Quasars at 6.3 < z ≤ 7.64 [PDF]
Astrophysical Journal, 2021 We report the results of near-infrared spectroscopic observations of 37 quasars in the redshift range 6.3 < z ≤ 7.64, including 32 quasars at z > 6.5, forming the largest quasar near-infrared spectral sample at this redshift. The spectra, taken with Keck,
Jinyi Yang +20 more
semanticscholar +1 more source
Quasars Probing Quasars. X. The Quasar Pair Spectral Database [PDF]
The Astrophysical Journal Supplement Series, 2018 Abstract The rare close projection of two quasars on the sky provides the opportunity to study the host galaxy environment of a foreground quasar in absorption against the continuum emission of a background quasar. For over a decade the “Quasars probing quasars” series has utilized this technique to further the understanding of galaxy ...
Joseph R. Findlay +10 more
openaire +6 more sources
Energy input from quasars regulates the growth and activity of black holes and their host galaxies [PDF]
Nature, 2005 In the early Universe, while galaxies were still forming, black holes as massive as a billion solar masses powered quasars. Supermassive black holes are found at the centres of most galaxies today, where their masses are related to the velocity ...
T. Matteo, V. Springel, L. Hernquist
semanticscholar +1 more source