Results 31 to 40 of about 512 (214)
Pictor A: A new double-peaked emission-line quasar [PDF]
The Astrophysical Journal, 1995 uu-encoded compressed tar of postscript files.
Sulentic, J. W. +3 more
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Spectroscopic follow-up of double quasar candidates [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 8 pages, 7 figures, 5 tables (full tables 1 and 3-5 are available online in a machine-readable ASCII format at https://grupos.unican.es/glendama/LQLM_results.htm). Accepted for publication in MNRAS (uncorrected version)
Shalyapin, V. N. +3 more
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Blueshifted Fe ii and Balmer Broad Emission lines in a Reddened Quasar
The Astrophysical Journal, 2023 We present detailed analysis of the optical and near-infrared spectrum of the reddened radio-loud quasar F2M J154043.74+492323.9 with strong optical Fe ii emission of ${R}_{4570}\equiv \tfrac{\mathrm{Fe}\,{\rm\small{II}}\lambda \lambda \,4434,4684}{{\rm ...
Yipeng Zhou +3 more
doaj +1 more source
The Pan-STARRS1 z > 5.6 Quasar Survey. III. The z ≈ 6 Quasar Luminosity Function
The Astrophysical Journal, 2023 We present the z ≈ 6 type-1 quasar luminosity function (QLF), based on the Pan-STARRS1 (PS1) quasar survey. The PS1 sample includes 125 quasars at z ≈ 5.7–6.2, with −28 ≲ M _1450 ≲ −25.
Jan-Torge Schindler +11 more
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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
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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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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
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
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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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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
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