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AGN optical-infrared relation
Although the population of quasars evolved significantly in the past, the properties of quasars as physical objects are supposed to remain almost unchanged, which makes quasars... -
Redshift and reddening of 125 QSOs behind M31
Our aim is to increase the limited number of quasars behind M 31, necessary for probing the chemical content of the gas and for proper motion reference, with reliable and... -
Morpho-phot. classification of KiDS DR5 sources
We present a novel multimodal neural network (MNN) for classifying astronomical sources in multiband ground-based observations, from optical to near-infrared (NIR), to separate... -
New quasars Ca II absorbers with SDSS spectra
We report discoveries of 165 new quasar Ca II absorbers from the Sloan Digital Sky Survey (SDSS) Data Releases 7 and 12. Our CA II rest-frame equivalent width distribution... -
Spectra of lensed QSOs (SSAP)
An archive of optical and near-infrared spectra of strongly lensed quasars and the lensing galaxies. The spectra are resolved to about a few Ångstroms and are flux-calibrated.... -
Maidanak Observatory Lens Images
Reduced frames of lensed quasar observations from Maidanak Observatory. See the referenceURL for details on the reduction procedure and calibration data. -
Apache Point observations of lensed quasars
Observations of the lensed quasar Q2237+0305 performed between 1995 and 1998. -
Liverpool Quasar Lens Monitoring
This collection includes optical monitorings of gravitationally lensed quasars. The frames can be used to make light curves of quasar images and field objects. From quasar light... -
ALMACAL IX calibrators for DSFGs/SMGs sources
Wide, deep, blind continuum surveys at submillimetre/millimetre (submm/mm) wavelengths are required to provide a full inventory of the dusty, distant Universe. However,... -
Source classifier with WISE * PS1 3{pi} DR2
We cross-match between the WISE All-Sky and PS1 3{pi} DR2 source catalogues. The resulting catalogue has 354590570 objects, significantly fewer than the parent PS1 catalogue,... -
4LAC FSRQs & BL Lac objects energy distributions
A sample of 312 low-frequency-peaked BL Lacertae objects (LBLs) and 694 flat-spectrum radio quasars (FSRQs) with the parameters of both redshift and gamma-ray photon spectral... -
Qasar pairs with Gaia astrometric data
Quasar pairs, a special subclass of galaxy pairs, are valuable in the investigation of quasar interaction and clustering, the coevolution between the two quasars' host galaxies,... -
Lens Image Archive
A collection of images of lensed quasars from various sources. Included are images from Maidanak Observatory (ivo://org.gavo.dc/maidanak/res/rawframes/siap), Apache Point... -
Tracing the high-z cosmic web with Quaia
Understanding the formation and evolution of the cosmic web of galaxies is a fundamental goal of both theoretical and observational cosmology, using various tracers of the... -
Strong MgII absorber blazars
It is widely believed that the cool gas clouds traced by MgII absorption, within a velocity offset of 5000km/s relative to the background quasar are mostly associated with the... -
ALHAMBRA fields type-I AGN with ELDAR
We present ELDAR, a new method that exploits the potential of medium- and narrow-band filter surveys to securely identify active galactic nuclei (AGN) and determine their... -
Detecting damped Ly{alpha} absorbers
We develop an automated technique for detecting damped Ly{alpha} absorbers (DLAs) along spectroscopic lines of sight to quasi-stellar objects (QSOs or quasars). The detection of... -
Intrinsic AGN SEDs in PG quasars
We present a new analysis of the Palomar-Green quasar sample based on Spitzer and Herschel observations. (i) Assuming polycyclic aromatic hydrocarbon (PAH)-based star formation... -
Extragalactic radio sources with recurrent jet
We present a sample of 74 radio sources with recurrent jet activity. The sample consists of 67 galaxies, 2 quasars and 5 unidentified sources, selected from the published data...
