Finding Multiply Lensed and Binary Quasars in the DESI Legacy Imaging Surveys
The Astrophysical Journal Supplement Series, 2023 The time delay between multiple images of strongly lensed quasars is a powerful tool for measuring the Hubble constant ( H _0 ). To achieve H _0 measurements with higher precision and accuracy using the time delay, it is crucial to expand the sample of ...
C. Dawes +6 more
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Double-Lobed Radio Quasars from the Sloan Digital Sky Survey [PDF]
The Astronomical Journal, 2006 We have combined a sample of 44984 quasars, selected from the Sloan Digital Sky Survey (SDSS) Data Release 3, with the FIRST radio survey. Using a novel technique where the optical quasar position is matched to the complete radio environment within 450", we are able to characterize the radio morphological make-up of what is essentially an optically ...
de Vries, W. H. +2 more
openaire +2 more sources
Exploring galaxy mass profiles in strongly lensed quasars with upcoming Roman Space Telescope observations [PDF]
EPJ Web of ConferencesStrong gravitational lensing of quasars is a powerful tool for probing cosmological parameters, tracing galaxy evolution, and investigating the internal structure of quasars.
Guliqani Esmeralda +2 more
doaj +1 more source
THE QUASAR SDSS J1536+0441: AN UNUSUAL DOUBLE-PEAKED EMITTER [PDF]
The Astrophysical Journal, 2010 The quasar SDSS J153636.22+044127.0, exhibiting peculiar broad emission-line profiles with multiple components, was proposed as a candidate sub-parsec binary supermassive black hole system. More recently, imaging revealed two spatially distinct sources, leading some to suggest the system to be a quasar pair separated by ~5 kpc.
Chornock, Ryan +9 more
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DOUBLE QUASARS: PROBES OF BLACK HOLE SCALING RELATIONSHIPS AND MERGER SCENARIOS [PDF]
The Astrophysical Journal, 2009 ApJ in ...
Foreman, G, Volonteri, M, DOTTI, MASSIMO
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Mid-Infrared Selected Quasars I: Virial Black Hole Mass and Eddington Ratios [PDF]
, 2014 We provide a catalog of 391 mid-infrared-selected (MIR, 24$\mu$m) broad-emission-line (BEL, type 1) quasars in the 22 deg$^2$ SWIRE Lockman Hole field. This quasar sample is selected in the MIR from Spitzer MIPS with $S_{\rm 24} > 400\mu$Jy, jointly with
Bergeron, Jacqueline +8 more
core +6 more sources
The Canada-France High-z Quasar Survey: nine new quasars and the luminosity function at redshift 6 [PDF]
, 2009 We present discovery imaging and spectroscopy for nine new z ~ 6 quasars found in the Canada-France High-z Quasar Survey (CFHQS) bringing the total number of CFHQS quasars to 19.
Alain Omont +52 more
core +4 more sources
Discovery of a quasar with double-peaked broad balmer emission lines
Monthly Notices of the Royal Astronomical Society: Letters, 2022 ABSTRACT Most massive galaxies contain a supermassive black hole (SMBH) at their centre. When galaxies merge, their SMBHs sink to the centre of the new galaxy, where they are thought to eventually merge. During this process, an SMBH binary is formed.
Jacco H Terwel, Peter G Jonker
openaire +4 more sources
Revisiting X-Ray-bright Optically Normal Galaxies with the Chandra Source Catalog
The Astrophysical Journal, 2023 X-ray bright optically normal galaxies (XBONGs) are galaxies with X-ray luminosities consistent with those of active galactic nuclei (AGNs) but no evidence of AGN optical emission lines.
Dong-Woo Kim +5 more
doaj +1 more source
A Survey for Large Separation Lensed FIRST Quasars, II. Magnification Bias and Redshift Distribution [PDF]
, 2002 The statistics of large-separation gravitational lensing are a powerful tool to probe mass distributions on the scale of galaxy clusters. In this paper we refine the analysis of our survey for large-separation (>5'') lensed FIRST quasars (Ofek et al ...
Maoz, Dan +3 more
core +3 more sources