Results 51 to 60 of about 40,224 (203)

VLA FRAMEx. II. Radio Spectra of Nearby Active Galactic Nuclei at Subarcsecond Resolution

The Astrophysical Journal
We present 4–12 GHz in-band spectral energy distributions with accompanying 6 GHz and 10 GHz imaging results for a volume-complete sample ( 0) spectral indices.
Andrew J. Sargent, Alexander J. van der Horst, Megan C. Johnson, Travis C. Fischer, Nathan J. Secrest, Phil J. Cigan, Onic I. Shuvo, Krista L. Smith   +7 more
doaj   +1 more source

Shock heating by FR I radio sources in galaxy clusters

, 2007
Feedback by active galactic nuclei (AGN) is frequently invoked to explain the cut-off of the galaxy luminosity function at the bright end and the absence of cooling flows in galaxy clusters. Meanwhile, there are recent observations of shock fronts around
Brueggen, M., Heinz, S., Roediger, E., Ruszkowski, M., Simionescu, A.   +4 more
core   +1 more source

Accretion and nuclear activity in Virgo early-type galaxies [PDF]

, 2010
We use Chandra observations to estimate the accretion rate of hot gas onto the central supermassive black hole in four giant (of stellar mass 10E11 - 10E12 solar masses) early-type galaxies located in the Virgo cluster.
A. Capetti, Allen, Balmaverde, Balmaverde, Best, Binggeli, Bondi, Capetti, Côté, E. Trussoni, Ferrarese, Gallo, Giovannini, Hardcastle, Heinz, Irwin, Isobe, Kriss, Lauer, Marconi, Mauch, Mei, Panessa, R. D. Baldi, Randall, Revnivtsev, Revnivtsev, S. Vattakunnel, Sivakoff, Soria, Soria, Tonry, Tremaine, Trujillo   +33 more
core   +1 more source

Study of the radio and optical properties of Active Galactic Nuclei

Communications of the Byurakan Astrophysical Observatory, 2021
The investigation of the physical properties of active galactic nuclei is one of the most important tasks of astronomy. Until now, the properties of AGN have not been fully studied. Therefore, we have studied a number of important properties of AGN. For example, one of the main properties of AGN is the variability.
openaire   +1 more source

Jet reorientation in active galactic nuclei: two winged radio galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
Winged, or X-shaped, radio sources form a small class of morphologically peculiar extragalactic sources. We present multifrequency radio observations of two such sources. We derive maximum ages since any re-injection of fresh particles of 34 and 17 Myr for the wings of 3C 223.1 and 3C 403 respectively, based on the lack of synchrotron and inverse ...
Dennett-Thorpe, J., Scheuer, P. A. G., Laing, R. A., Bridle, A. H., Pooley, G. G., Reich, W.   +5 more
openaire   +1 more source

Biomimetic Polymerization of Tellurocysteine: Breaking the Natural Amino Acid Radioprotection Limitation

Advanced Science, EarlyView.
Inspired by natural amino acid polymer‐melanin systems, this study strategically incorporated tellurocysteine to develop advanced radiation‐shielding materials. This approach transformed the primary interaction mechanism between melanin‐based materials and incident photons from Compton scattering to the photoelectric effect. Tellurocysteine‐polymerized
Wei Chen, Hanjie Zhu, Yue Zhang, Yuqing Qiao, Ruotong Deng, Huaping Xu, Wei Cao   +6 more
wiley   +1 more source

Mid-infrared Properties of Narrow-line Seyfert 1 Galaxies Detected by LoTSS DR2

The Astrophysical Journal
Narrow-line Seyfert 1 galaxies (NLS1s), a subclass of active galactic nuclei (AGNs) in an early stage of the accretion process, are also found to host relativistic jets. However, currently known jetted NLS1s are rare. The majority of NLS1s are undetected
Xu-Liang Fan
doaj   +1 more source

Testing the Linear Relationship between Black Hole Mass and Variability Timescale in Low-luminosity AGNs at Submillimeter Wavelengths

The Astrophysical Journal, 2023
The variability of submillimeter emission provides a useful tool to probe the accretion physics in low-luminosity active galactic nuclei. We accumulate four years of observations using the Submillimeter Array for Centaurus A, NGC 4374, NGC 4278, and NGC ...
Bo-Yan Chen, Geoffrey C. Bower, Jason Dexter, Sera Markoff, Anthony Ridenour, Mark A. Gurwell, Ramprasad Rao, Sofia H. J. Wallström   +7 more
doaj   +1 more source

Deep Learning‐Assisted Coherent Raman Scattering Microscopy

Advanced Intelligent Discovery, EarlyView.
The analytical capabilities of coherent Raman scattering microscopy are augmented through deep learning integration. This synergistic paradigm improves fundamental performance via denoising, deconvolution, and hyperspectral unmixing. Concurrently, it enhances downstream image analysis including subcellular localization, virtual staining, and clinical ...
Jianlin Liu, Rujia Liu, Xinyan Zhang, Xun Chen, Shuhua Yue   +4 more
wiley   +1 more source

Shocks, Winds, and a Torus: the Large Binocular Telescope Interferometer (LBTI) Resolves the Active Nucleus of NGC 4151

The Astrophysical Journal
We present mid-infrared (MIR) observations of the Seyfert 1 galaxy NGC 4151 using the Large Binocular Telescope Interferometer (LBTI). We took open-loop Fizeau images with 66–104 mas (5.8–9.1 pc) resolution in the N -band (at 8.7 and 10.5  μ m), using ...
Jacob W. Isbell, Steve Ertel, Makoto Kishimoto, Gerd Weigelt, Jörg-Uwe Pott, Jared Carlson, Qixiang Duan, Violeta Gámez Rosas, Walter Jaffe, James Leftley, Daniel May, Romain. G. Petrov, Jennifer Power, Hélène Rousseau, Justin Rupert   +14 more
doaj   +1 more source