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Optical variability of 190 Quasars in S82 region
We study the optical gri photometric variability of a sample of 190 quasars within the SDSS Stripe 82 region that have long-term photometric coverage during ~1998-2020 with... -
Spectral properties of 105 SDSS-DR7 quasars
The radio emission is an important observable of quasars, but its relationship to Eigenvector 1 and the [O III] {lambda}5007 Baldwin Effect is not fully understood. We explore... -
Chandra observations of 2106 radio-quiet QSOs
We present Chandra observations of 2106 radio-quiet quasars in the redshift range 1.7<=z<=2.7 from the Sloan Digital Sky Survey (SDSS), through data release fourteen... -
Changing-state quasars with CRTS
We present the results of a systematic search for quasars in the Catalina Real-time Transient Survey exhibiting both strong photometric variability and spectroscopic variability... -
The Southern Stellar Stream Sp. Survey (S^5^)
We introduce the Southern Stellar Stream Spectroscopy Survey (S^5^), an on-going program to map the kinematics and chemistry of stellar streams in the southern hemisphere. The... -
Broad-line velocity shifts in 1.5<z<7.5 quasars
We present the results of a model-independent investigation of the rest-frame UV spectra from a comprehensive sample of 394 quasars in the redshift range 1.5=<z=<7.5. We... -
Low Ionization BALQSOs MgII and AlIII variability
We present results of our time variability studies of MgII and AlIII absorption lines in a sample of 22 Low Ionization Broad Absorption Line QSOs (LoBAL QSOs) at... -
Low-redshift quasars in SDSS Stripe 82
We present a photometrical and morphological study of the properties of low-redshift (z<0.5) quasars based on a large and homogeneous data set of objects derived from the... -
X-ray survey of the 2Jy sample. I.
We carry out a systematic study of the X-ray emission from the active nuclei of the 0.02 -
SDSS J155810.16-003120.0 abundances
We present a measurement of the D/H abundance ratio in a metal-poor damped Ly{alpha}(DLA) system along the sight line of QSO SDSS 1558-0031. -
Revised and Updated Catalog of Quasi-stellar Objects
This is a catalog of all known quasi-stellar objects (QSO's) with measured emission redshifts and BL Lac objects, complete to 1992 December 31. The catalog contains 7312... -
Compact steep spectrum new sample
We present a new sample of compact steep spectrum (CSS) sources with radio luminosity below 10^26^W/Hz at 1.4GHz; these are called low-luminosity compact (LLC) objects. The... -
Lyman{alpha} emitting galaxies at z=2.38
In Paper 1 (Palunas et al., 2004ApJ...602..545P) of this series we identified an 80 comoving Mpc filament of candidate Ly{alpha}-emitting galaxies at redshift 2.38. In this... -
Polarization of broad absorption line QSOs
We present the combined results of optical polarization surveys of QSOs showing broad absorption lines (BALQSOs) conducted at the Steward and McDonald Observatories. The merged... -
QSO low-z Ly{alpha} absorbers
To study the nature of low-z Ly{alpha} absorbers in the spectra of QSOs, we have obtained high signal-to-noise ratio (S/N) UV spectra of H1821+643 (z_em_=0.297) and PG 1116+215... -
Gravitationally Lensed Quasars
The Snapshot Survey was a search for cases of gravitational lensing among intrinsically-luminous, high-redshift quasars using the Hubble Space Telescope (HST) Planetary Camera... -
24 new radio-bright quasars spectra
We present the discovery of 20 new radio bright quasars (and the independent confirmation of 4) between 4.9 -
Quasars as high-redshift standard candles
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used to derive quasar distances and to build a Hubble diagram at redshifts up to... -
Literature low-z measurements
We present new joint XMM-Newton and NuSTAR observations of APM 08279+5255, a gravitationally-lensed, broad-absorption line quasar (z=3.91). After showing a fairly stable flux... -
The eFEDS AGN catalog
The eROSITA Final Equatorial Depth Survey (eFEDS), observed with eROSITA ahead of its planned four-year all-sky survey, is the largest contiguous-field X-ray survey at present....
