Results 61 to 70 of about 77,605 (280)
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
Changing-look active galactic nuclei
Nature Astronomy, 2023 Active Galactic Nuclei (AGN) are known to show flux variability over all observable timescales and across the entire electromagnetic spectrum. Over the past decade, a growing number of sources have been observed to show dramatic flux and spectral changes, both in the X-rays and in the optical/UV.
Claudio Ricci, Benny Trakhtenbrot
openaire +2 more sources
Self‐Healing Materials from Electronically Integrated Microscopic Robots
Advanced Intelligent Systems, EarlyView.Submillimeter robots can use electronically controlled electrodeposition to assemble into a material structure. The resulting aggregate possesses ultralow density, high strength‐to‐weight ratio, and can heal from damage. Further afield, these results clear a path to materials that organize or adapt by directing matter and information at the microscale.
Lucas C. Hanson +2 more
wiley +1 more source
The Merging Galaxy Cluster Environment Affects the Morphology of Radio Active Galactic Nuclei
The Astrophysical JournalIt has previously been found that the galaxy cluster environment can affect the fueling and evolution of active galactic nuclei (AGN). This work examines the effect of the merging cluster environment on the properties of radio AGN by comparing the radio ...
Mary Rickel +6 more
doaj +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 role of the central stellar cluster in active galactic nuclei. I. Semi-analytical model [PDF]
, 2002 The subject of the paper is the role of the massive stellar cluster in the activity phenomenon and in the structure of active galactic nuclei. We introduce a simple model of stellar dynamics in the internal part of the cluster, which allows us to include
Czerny, B., Vilkoviskij, E. Y.
core +2 more sources
Astronomische Nachrichten, EarlyView.ABSTRACT The physics of heavy‐ion collisions is one of the most exciting and challenging directions of science for the last four decades. On the theoretical side one deals with a non‐abelian field theory, while on the experimental side today's largest accelerators are needed to enable these studies.
Marcus Bleicher, Elena Bratkovskaya
wiley +1 more source
Pyrrole‐Imine Macrocycle: Self‐Organizing Cross‐Reactive Anion Receptor and Sensor
Chemistry – A European Journal, EarlyView.An imine macrocycle comprising pyrroles as hydrogen‐bond donors and an environmentally sensitive fluorophore displays a wide cross‐reactive binding, which, in combination with an analyte‐specific fluorescence response allows differentiation between ten analytes and their concentrations.
Austin R. Sartori +8 more
wiley +1 more source
, 2018 I will review the current understanding of the observational and physical properties of jetted active galactic nuclei.
openaire +3 more sources
Variability in Active Galactic Nuclei [PDF]
International Astronomical Union Colloquium, 1993 AbstractAGN (Active Galactic Nuclei) have their profound time variability over a wide range of time scales. Although many results of AGN variability have been provided from wide band wavelength observations, I would like to concentrate the recent problems concerning a nearby region of their central engine based on the X-ray observations which are most ...
openaire +2 more sources