Mid-Infrared Spectroscopic Properties of Ultra-Luminous Infrared Quasars
, 2008 We analyse mid-infrared (MIR) spectroscopic properties for 19 ultra-luminous infrared quasars (IR QSOs) in the local universe based on the spectra from the Infrared Spectrograph on board the Spitzer Space Telescope.
Armus +72 more
core +2 more sources
Use of neural networks for the identification of new z>=3.6 QSOs from FIRST-SDSS DR5 [PDF]
, 2008 We aim to obtain a complete sample of redshift > 3.6 radio QSOs from FIRST sources having star-like counterparts in the SDSS DR5 photometric survey (r=3.6 QSO candidates. We obtained spectra of 27 of them, and 17 are confirmed as high-z QSOs.
Benn, C. R. +3 more
core +3 more sources
The Chandra Source Catalog Normal Galaxy Sample
The Astrophysical Journal Supplement Series, 2023 We present the extensive and well-characterized Chandra X-ray Galaxy Catalog (CGC) of 8547 galaxy candidates in the redshift range z ∼ 0.04–0.7, optical luminosity 10 ^10 –10 ^11 L _r _⊙ , and X-ray luminosity (0.5–7 keV) L _X = 2 × 10 ^40 –2 × 10 ^43 ...
Dong-Woo Kim +6 more
doaj +1 more source
Are QSOs Gravitationally Lensed? [PDF]
Symposium - International Astronomical Union, 1983 There are now four known cases of multiply imaged QSOs, one with a detected foreground object at roughly half the affine distance to the QSO: 0957+561 (17 mag, z=1.4, separation =6″), 1115+080 (17 mag, z=1.7, sl=1.8″, s2=2.3″), 2345+007 (19 mag, z=2.1, s=7″) and 1635+267 (19 mag z=2, s=5″). In addition, 1548+115 (19 mag, z=1.9) is a probable lens event
openaire +2 more sources
CLEAR: High-ionization [Ne v] λ3426 Emission-line Galaxies at 1.4 < z < 2.3
The Astrophysical Journal, 2023 We analyze a sample of 25 [Ne v ] ( λ 3426) emission-line galaxies at 1.4 < z < 2.3 using Hubble Space Telescope/Wide Field Camera 3 G102 and G141 grism observations from the CANDELS Ly α Emission at Reionization (CLEAR) survey.
Nikko J. Cleri +15 more
doaj +1 more source
The central structure of Broad Absorption Line QSOs: observational characteristics in the cm-mm wavelength domain [PDF]
, 2012 Accounting for ~20% of the total QSO population, Broad Absorption Line QSOs are still an unsolved problem in the AGN context. They present wide troughs in the UV spectrum, due to material with velocities up to 0.2 c toward the observer.
Bruni G +16 more
core +2 more sources
The environments of intermediate-redshift QSOs: 0.3 < z < 0.7 [PDF]
, 1999 An angular correlation of low significance (2 sigma) is observed between 0.3 < z < 0.5 QSOs and V < 23 galaxies. Overall, the cross-correlation function between 82 intermediate-redshift (0.3 < z < 0.7), X-ray selected QSOs and V < 24 galaxies is ...
Boyle, B. J. +2 more
core +2 more sources
Is there a connection between Broad Absorption Line Quasars and Narrow Line Seyfert 1 galaxies?
, 2014 We consider whether Broad Absorption Line Quasars (BAL QSOs) and Narrow Line Seyfert 1 galaxies (NLS1s) are similar, as suggested by Brandt & Gallagher (2000) and Boroson (2002).
Grupe, Dirk, Nousek, John A.
core +1 more source
The High A(V) Quasar Survey: Reddened quasi-stellar objects selected from optical/near-infrared photometry - II [PDF]
, 2015 Quasi-stellar objects (QSOs) whose spectral energy distributions (SEDs) are reddened by dust either in their host galaxies or in intervening absorber galaxies are to a large degree missed by optical color selection criteria like the one used by the Sloan
Fynbo, J. P. U. +11 more
core +2 more sources
C IV Broad Absorption Line Variability in QSO Spectra from SDSS Surveys
Frontiers in Astronomy and Space Sciences, 2017 Broad absorption lines (BALs) in the spectra of quasi-stellar objects (QSOs) are thought to arise from outflowing winds along our line of sight; winds, in turn, are thought to originate from the accretion disk, in the very surroundings of the central ...
Demetra De Cicco +7 more
doaj +1 more source