Results 21 to 30 of about 515 (214)
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 prevalence of FRI radio quasars [PDF]
, 2007 We present deep, multi-VLA-configuration radio images for a set of 18 quasars, having redshifts between 0.36 and 2.5, from the 7C quasar survey. Approximately one quarter of these quasars have FRI-type twin-jet structures and the remainder are a broad ...
Blundell, Katherine +7 more
core +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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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
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
A catalogue of quasars and active nuclei: 11th edition [PDF]
, 2003 The recent release of the final installement of the 2dF quasar catalogue and of the first part of the Sloan catalogue, almost doubling the number of known QSOs, led us to prepare an updated version of our Catalogue of quasars and active nuclei which ...
P. Véron, M.-P. Véron-Cetty
core +1 more source
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
openaire +2 more sources
A catalogue of quasars and active nuclei: 10th edition [PDF]
, 2001 The recent publication of the first release of the 2dF quasar catalogue (Croom et al. [CITE]) containing nearly 10 000 new QSOs, almost doubling the number of known such objects, led us to prepare an updated version of our catalogue of quasars and ...
P. Véron, M.-P. Véron-Cetty
core +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
openaire +2 more sources