Results 71 to 80 of about 80,128 (249)
The Astrophysical Journal Supplement SeriesWe present the active galactic nuclei (AGN) catalog from the fourth data release (HDR4) of the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). HETDEX is an untargeted spectroscopic survey.
Chenxu Liu +9 more
doaj +1 more source
Heating Hot Atmospheres with Active Galactic Nuclei
, 2007 High resolution X-ray spectroscopy of the hot gas in galaxy clusters has shown that the gas is not cooling to low temperatures at the predicted rates of hundreds to thousands of solar masses per year.
Arnaud M +12 more
core +1 more source
Advanced Science, Volume 13, Issue 2, 9 January 2026.The advent of aptamers has highlighted their potential as alternatives to antibodies, overcoming limitations of structural instability and production cost. However, conventional approaches such as SELEX remain slow and labor‐intensive. This review examines recent advances in aptamer engineering, emphasizing in vitro and AI‐driven in silico strategies ...
John V. L. Nguyen +5 more
wiley +1 more source
Miscellaneous observations of active galactic nuclei. II
, 1997 We observed 37 AGN candidates and classified them on the basis of their spectroscopic properties; three are confirmed QSOs, one is a BL Lac object, nine are Seyfert 1 galaxies, four Seyfert 2s, while twenty are HII regions.Comment: LaTeX 2e, 15 pages (4 ...
Goncalves, A. C. +2 more
core +1 more source
The QPO in RE J1034+396 Originates in the Hot Corona
The Astrophysical JournalRE J1034+396 is one of the few active galactic nuclei (AGNs) with a significant quasiperiodic oscillation (QPO). The QPO has been observed in over 1 Ms of XMM-Newton observations spanning over a decade. We investigate the power spectral density function (
Chloe S. Taylor +2 more
doaj +1 more source
Reverberation mapping of active galactic nuclei: from X-ray corona to dusty torus. [PDF]
iScience, 2021 Cackett EM, Bentz MC, Kara E.
europepmc +1 more source
Observational Signatures of Galactic Winds Powered by Active Galactic Nuclei
, 2014 We predict the observational signatures of galaxy scale outflows powered by active galactic nuclei (AGN). Most of the emission is produced by the forward shock driven into the ambient interstellar medium (ISM) rather than by the reverse shock.
Faucher-Giguere, Claude-Andre +2 more
core +1 more source
Active Galactic Nuclei and Transformation of Dark Matter into Visible Matter
, 2009 The hypothesis that dark matter is converted into visible particles in active galactic nuclei is investigated. If dark matter consists of stable superheavy neutral particles and active galactic nuclei are rotating black holes, then, due to the Penrose ...
A. A. Grib +15 more
core +1 more source
Reverberation Mapping Data of NGC 5548 Imply a Multicomponent Broad-line Region
The Astrophysical JournalLine broadening and variability are observational hallmarks of active galactic nuclei (AGN) which allow us to measure supermassive black hole masses as well as constrain the geometry and kinematics of the emitting gas, with the most precise measurements ...
Kirk Long, Jason Dexter
doaj +1 more source
Mid-infrared Variability in Nearby Galaxies from the MaNGA Sample
The Astrophysical JournalWe use mid-infrared variability in galaxies to search for active galactic nuclei (AGN) in the local universe. We use a sample of 10,220 galaxies from the Mapping Nearby Galaxies at Apache Point Observatory survey, part of the Sloan Digital Sky Survey ...
Aashay Pai +2 more
doaj +1 more source