Results 61 to 70 of about 78,490 (277)

The Messy Nature of Fiber Spectra: Star–Quasar Pairs Masquerading as Dual Type 1 AGNs

The Astrophysical Journal, 2023
Theoretical studies predict that the most significant growth of supermassive black holes (SMBHs) occurs in late-stage mergers, coinciding with the manifestation of dual active galactic nuclei (AGNs), and both major and minor mergers are expected to be ...
Ryan W. Pfeifle, Barry Rothberg, Kimberly A. Weaver, Remington O. Sexton, Jenna M. Cann, Nathan J. Secrest, Michael A. Reefe, Thomas Bohn   +7 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, B.R. McNamara, Binney J, Braginskii SI, Cavaliere A, Gallagher JS, Kronberg PP, P.E.J. Nulsen, Pedlar A, Reynolds CS, Roediger E, Sarazin CL, Spitzer L   +12 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

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, William H. Reinhardt, Marc Z. Miskin   +2 more
wiley   +1 more source

The Response of Warm Absorbers to the Variations in the Ionizing Continuum in the Active Galaxy NGC 4051

The Astrophysical Journal
We present a time-resolved X-ray spectral analysis of the warm absorbers in the Seyfert galaxy NGC 4051, which has an active galactic nucleus (AGN), using observations from the Neutron Star Interior Composition Explorer (NICER).
Dev R. Sadaula, Timothy R. Kallman, Sibasish Laha   +2 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., Veron, P., Veron-Cetty, M. -P.   +2 more
core   +1 more source

Infrared Photovoltaic–Battery Hybrid Systems Enabled by Colloidal Quantum Dots

Chemistry – An Asian Journal, EarlyView.
Photovoltaic–battery (PV/B) hybrid systems are key for sustainable energy but face cost and efficiency limits. Colloidal quantum dots (CQDs) enable low‐cost near‐infrared light harvesting, surpassing silicon and III–V PVs. This review analyzes CQD properties, their roles in NIR PVs and batteries, and synthesizes current research to highlight progress ...
Hong Ji, Renjun Liu, Peter Smowton, Bo Hou   +3 more
wiley   +1 more source

The Merging Galaxy Cluster Environment Affects the Morphology of Radio Active Galactic Nuclei

The Astrophysical Journal
It 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, Emily Moravec, Yjan A. Gordon, Martin J. Hardcastle, Jonathon C. S. Pierce, Lawrence E. Bilton, Ian D. Roberts   +6 more
doaj   +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, Nims, Jesse, Quataert, Eliot   +2 more
core   +1 more source

Intermediate-mass Black Holes in Galactic Nuclei [PDF]

, 2004
We present the first homogeneous sample of intermediate-mass black hole candidates in active galactic nuclei. Starting with broad-line active nuclei from the Sloan Digital Sky Survey, we use the linewidth-luminosity-mass scaling relation to select a ...
Barth, A. J., Greene, J. E., Ho, L. C.
core   +3 more sources