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MUSE Analysis of Gas around Galaxies II
We present a study of the metal-enriched cool halo gas traced by MgII absorption around 228 galaxies at z~0.8-1.5 within 28 quasar fields from the MUSE Analysis of Gas around... -
Neutral hydrogen evolution over the past 11Gyr
We present the results of a blind search for intervening HI 21cm absorption towards 260 radio sources in the redshift range 0<z<2.74 with the Green Bank Telescope. The... -
Extreme quasar X-ray variability
We analyze 1598 serendipitous Chandra X-ray observations of 462 radio-quiet quasars to constrain the frequency of extreme amplitude X-ray variability that is intrinsic to the... -
Lyman limit systems in large quasar surveys
We present a pipeline based on a random forest classifier for the identification of high column density clouds of neutral hydrogen (i.e. the Lyman limit systems, LLSs) in... -
Behaviour of the MgII 2798{AA} line in AGNs
We investigate the responsiveness of the 2798{AA} MgII broad emission line in active galactic nuclei (AGNs) on time-scales of several years. Our study is based on a sample of... -
L_x_-L_uv_-L_radio_ relation in radio-loud quasars
Radio-loud quasars (RLQs) are more X-ray luminous than predicted by the X-ray-optical/UV relation (i.e. L_x_{prop.to}L_uv_^{gamma}^) for radio-quiet quasars (RQQs). The excess... -
Carbon-loud SDSS BOSS type II quasars at z>2
We study the ultraviolet (UV) emission-line ratios of a sample of 145 type II quasars (QSO2s) from Sloan Digital Sky Survey III Baryon Oscillation Spectroscopic Survey, and... -
AGN jet shape transition geometry
Observational studies of collimation in jets in active galactic nuclei (AGN) are a key to understanding their formation and acceleration processes. We have performed an... -
NIR and MIR photometry of known z>=5 quasars
We assemble a catalogue of 488 spectroscopically confirmed very high (z>=5.00) redshift quasars (VHzQ) and report their near- (ZYJHK_s_/K) and mid- (WISE W1234) infrared... -
Circumgalactic medium of galaxies at z~4-5
We present a study of the galaxy environment of nine strong HI+CIV absorption line systems (16.2<log(N(HI))<21.2) spanning a wide range in metallicity at z~4-5, using MUSE... -
GALEX EUV quasar colours of SDSS QSOs DR14
The rest-frame far to extreme ultraviolet (UV) colour-redshift relationship has been constructed from data on over 480,000 quasars carefully cross-matched between SDSS Data... -
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... -
MAGG I Near pristine gas cloud at z~3.5
We present the design, methods, and first results of the MUSE Analysis of Gas around Galaxies (MAGG) survey, a large programme on the Multi-Unit Spectroscopic Explorer (MUSE)... -
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... -
Quasar winds and narrow absorption lines
We use the spectra of 73 quasars (1.5=<z=<5) from the VLT UVES archive to catalogue and study narrow absorption lines (NALs) that are physically associated with (intrinsic... -
Sub-damped Ly{alpha} systems in XQ-100 survey
Sub-damped Lyman {alpha} systems (subDLAs; HI column densities of 19.0<=logN(HI)<20.3) are rarely included in the cosmic HI census performed at redshifts z_abs_>=1.5,... -
Calibration of the virial factor f in SMBHs
Using a compiled sample of 34 broad-line active galactic nuclei (AGNs) with measured H{beta} time lags from the reverberation mapping (RM) method and measured bulge stellar... -
AGN UV luminosity function
We present lists of more than 80000 mostly UV-optical colour-selected AGN from 12 data sets, homogenised with respect to the assumed cosmology, magnitude system, and bandpass... -
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...
