Results 21 to 30 of about 1,391,040 (211)
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
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
doaj +1 more source
Unusual double-peaked emission in the SDSS quasar J093201.60+031858.7 [PDF]
New Astronomy, 2011 Author list updated in version 2; 17 pages; 3 figures; accepted for publication in New ...
Barrows, R. Scott +4 more
openaire +2 more sources
Massive ionized outflows in quasars [PDF]
, 2017 The most luminous quasars in the Hamburg- ESO (HE) survey show, at a high prevalence, CIV λ1549 and [OIII]λλ4959,5007 emission line profiles with high-amplitude blueshifts which indicate outflows occurring over a wide range of spatial scales.
Del Olmo, Ascension +6 more
core +1 more source
A Close-Separation Double Quasar Lensed by a Gas-rich Galaxy [PDF]
The Astronomical Journal, 2000 In the course of a Cycle 8 snapshot survey, we have discovered that the z=1.565 quasar HE 0512-3329 is a double with image separation 0.644", almost certainly due to gravitational lensing. The two components differ in brightness by only 0.4 magnitudes and a high signal-to-noise ground-based composite optical spectrum shows no trace of any stellar ...
Gregg, Michael D. +7 more
openaire +2 more sources
Redshifts and lens profile for the double quasar QJ 0158-4325 [PDF]
Astronomy & Astrophysics, 2009 Research Note, Accepted for publication in A& ...
Faure C. +7 more
openaire +3 more sources
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
openaire +2 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
The double quasar Q2138-431: detection of a lensing galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT This paper reviews the question of whether the wide separation double quasar Q2138-431 is a gravitational lens. From early work, the two quasar images are known to have almost identical spectra and redshifts, but no lensing galaxy has so far been detected.
openaire +2 more sources
Highly accreting quasars at high redshift [PDF]
, 2017 The first results of a spectroscopic analysis for a sample of type I highly accreting quasars (L/LEdd ~ 1) at redshift z~2-3 observed with the OSIRIS spectrograph on the GTC 10.4 m ...
Marziani, Paola +12 more
core +1 more source