1,790 datasets found

Compton-thick active galactic nuclei (CT-AGNs), defined by column density N_H_>=1.5x10^24^cm^-2^, are so heavily absorbed that their X-ray emission is often feeble, even...

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...

Tidal disruption events (TDEs) have been proposed as valuable laboratories for studying dormant black holes. However, progress in this field has been hampered by the limited...

We present the Living Swift-XRT Point Source (LSXPS) catalogue and real-time transient detector. This system allows us for the first time to carry out low- latency searches for...

We perform a comprehensive search for high-velocity X-ray sources with large X-ray/optical flux ratios (F_X_/F_G_), identifying candidates for interacting black hole or neutron...

Changing-state active galactic nuclei (CSAGNs) exhibit rapid variability, with mass accretion rates that can change by several orders of magnitude in a few years. This provides...

We present an analysis of the X-ray active galactic nucleus (AGN) population in a sample of seven massive galaxy clusters in the redshift range 0.35<z<0.45. We utilize...

To date, three nuclear transients have been associated with high-energy neutrino events. These transients are generally thought to be powered by tidal disruptions of stars...

Stellar soft X-ray ([1, 100]{AA}) and Extreme Ultraviolet (also EUV, [100, 920]{AA}; jointly, XUV) radiation affects the evolution and chemistry of exoplanet atmospheres. It is...

Using data from the all-sky X-ray survey with the eROSITA telescope onboard the SRG orbital observatory and the optical catalog of Hyades cluster members constructed from Gaia...

The nearby dwarf galaxy POX 52 at z=0.021 hosts an active galactic nucleus (AGN) with a black hole (BH) mass of M_BH_~10^5-6^M_{sun} and an Eddington ratio of ~0.1-1. This...

The intense X-ray and UV emission of some active M stars has raised questions about the habitability of planets around M-type stars. We aim to determine the unbiased...

The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from the inner accretion disk to the broad...

We present an X-ray point-source catalogue from the XMM-Large Scale Structure (XMM-LSS) survey region, one of the XMM-Spitzer Extragalactic Representative Volume Survey...

The MORX (Millions of Optical - Radio/X-ray Associations) v2 catalog presents 3115575 optical objects which are calculated as being 40%-100% likely to be associated to radio or...

This automated catalogue combines all the largest published optical, radio and X-ray sky catalogues to find probable radio/X-ray associations to optical objects, plus double...

We present a catalog of cross-correlated radio, infrared and X-ray sources using a very restrictive selection criteria with an IDL-based code developed by us. The significance...

An all-sky comprehensive catalogue of calculated radio and X-ray associations to optical objects is presented. Included are X-ray sources from XMM-Newton, Chandra and ROSAT...

The images of the Sagittarius arm tangent obtained with the IBIS telescope of the INTEGRAL observatory in the energy range 18-120keV during their observations in the spring of...

From August 23 through September 24, 2003, the INTEGRAL Observatory conducted a deep survey of Galactic-Center region with a record-breaking sensitivity at energies above 20keV....