Results 71 to 80 of about 58,921 (147)
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XIII: Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231 [PDF]
, 2013 We present the results from nine years of optically monitoring the gravitationally lensed z=0.658 quasar RX J1131-1231. The R-band light curves of the four individual images of the quasar were obtained using deconvolution photometry for a total of 707 ...
A. M. Mosquera +61 more
core +2 more sources
On the isoperimetric Riemannian Penrose inequality
Communications on Pure and Applied Mathematics, Volume 78, Issue 5, Page 1042-1085, May 2025.Abstract We prove that the Riemannian Penrose inequality holds for asymptotically flat 3‐manifolds with nonnegative scalar curvature and connected horizon boundary, provided the optimal decay assumptions are met, which result in the ADM$\operatorname{ADM}$ mass being a well‐defined geometric invariant.
Luca Benatti +2 more
wiley +1 more source
On the link between associated MgII absorbers and star formation in quasar hosts
, 2012 A few percent of quasars show strong associated MgII absorption, with velocities (v_off) lying within a few thousand km/s from the quasar systemic redshift.
Bahcall +22 more
core +1 more source
, 2017 Studies of the most luminous quasars at high redshift directly probe the evolution of the most massive black holes in the early Universe and their connection to massive galaxy formation.
Fan, Xiaohui +6 more
core +1 more source
New Astronomy Reviews, 2006 8 pages, 6 figures, review article with C. Impey at the conference on "QSO Host Galaxies: Evolution and Environment", Aug. 29-Sep.
Hans-Walter Rix +7 more
openaire +3 more sources
Binary Quasars in the Sloan Digital Sky Survey: Evidence for Excess Clustering on Small Scales
, 2005 We present a sample of 218 new quasar pairs with proper transverse separations R_prop < 1 Mpc/h over the redshift range 0.5 < z < 3.0, discovered from an extensive follow up campaign to find companions around the Sloan Digital Sky Survey and 2dF Quasar ...
Bartosz Pindor +38 more
core +2 more sources
United European Gastroenterology Journal, Volume 13, Issue 4, Page 542-551, May 2025.ABSTRACT Background Eligibility criteria in clinical trials have been criticised for being overly restrictive without clinical justification. Objective We aimed to investigate the types, evolution, and current status of eligibility criteria in clinical trials for inflammatory bowel diseases (IBD).
An Outtier +7 more
wiley +1 more source
Cosmological Origin of Quasars [PDF]
Annals of the New York Academy of Sciences, 1995 Quasars are the earliest objects known to exist. We examine their origin in the context of popular models for structure formation in the universe. We show that seeds for quasar black holes could have originated from the initial cosmological collapse of overdense regions with unusually small rotation.
openaire +3 more sources
, 2011 We present the SDSS-XDQSO quasar targeting catalog for efficient flux-based quasar target selection down to the faint limit of the Sloan Digital Sky Survey (SDSS) catalog, even at medium redshifts (2.5
Abazajian +69 more
core +1 more source
Calibrating the Galaxy Halo - Black Hole Relation Based on the Clustering of Quasars
, 2004 The observed number counts of quasars may be explained either by long-lived activity within rare massive hosts, or by short-lived activity within smaller, more common hosts.
Abraham Loeb +4 more
core +1 more source