1,753 datasets found

We present light curves and flares from a 7 day, multiwavelength observational campaign of AU Mic, a young and active dM1e star with exoplanets and a debris disk. We report on...

We perform X-ray spectral analyses to derive the characteristics (e.g., column density, X-ray luminosity) of ~10200 active galactic nuclei (AGNs) in the XMM-Spitzer...

High synchrotron energy peaked blazar 1ES 1959+650 was studied with the Swift and XMM-Newton satellites in a total of 127 observations during the period 2018 June-2020 December....

ASASSN-14ko is a nuclear transient at the center of the AGN ESO253-G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated...

Recent works have developed samples of blazars from among the Fermi Large Area Telescope unassociated sources via machine-learning comparisons with known blazar samples....

The detection of the extended X-ray emission of the intracluster medium by the first SRG/eROSITA All-Sky Survey (eRASS1), combined with optical and near-infrared follow-up,...

Stellar X-ray and UV radiation can significantly affect the survival, composition, and long-term evolution of the atmospheres of planets in or near their host star's habitable...

Active galactic nuclei (AGN) stand as extreme X-ray emitters where disk-corona interplay shapes their spectral energy distribution. The soft X-ray excess, a unique feature of...

The XMMSL3 catalogue is the third version of the XMM-Newton slew catalogue. It contains detections drawn from 3120 XMM-Newton pn slew observations, covering an energy interval...

This table records high-level information for each Swift observation and provides access to the data archive. Each record is associated with a single observation that contains...

These spectra are optical follow-up observations of the X-ray sources detected in the 942 ks exposure of the Chandra Deep Field-South (CDFS) using FORS.

Unexpectedly strong X-ray emission from extragalactic radio jets on kiloparsec scales has been one of the major discoveries of Chandra, the only X-ray observatory capable of...

We aim to carry out a radio study of the SoUthern Cluster sCale Extended Source Survey (SUCCESS) sample consisting of twenty massive (M_500_>5x10^14^M_{sun}_), nearby...

It is known that the GRB equivalent hydrogen column density (N_HX_) changes with redshift and that, typically, N_HX_ is greater than the GRB host neutral hydrogen column...

The detection of X-ray emission constitutes a reliable and efficient tool for the selection of active galactic nuclei (AGNs), although it may be biased against the most heavily...

We investigate the infrared colours and spectral energy distributions (SEDs) of 338 X-ray selected active galactic nuclei (AGNs) from the Swift/Burst Alert Telescope (BAT)...

To answer major questions on supermassive black hole (SMBH) and galaxy evolution, a complete census of SMBH growth, i.e. active galactic nuclei (AGN), is required. Thanks to...

This article presents the results of a spectroscopic analysis of the X-CLASS-redMaPPer (XC1-RM) galaxy cluster sample. X-CLASS is a serendipitous search for clusters in X-ray...

Star clusters are ideal platforms for categorizing X-ray emitting stars and to study X-ray emission as a function of stellar age and activity. We present a comprehensive study...

We introduce a galaxy cluster mass observable, {mu}, based on the stellar masses of cluster members, and we present results for the Dark Energy Survey (DES) Year 1 (Y1)...