Results 51 to 60 of about 282 (177)

Intra-night Optical Variability and Radio Characteristics of Extremely Radio-loud Narrow-line Seyfert 1 Galaxies

The Astrophysical Journal
Narrow-line Seyfert 1 galaxies (NLS1s) are generally known to be radio-quiet active galactic nuclei, but a tiny subset of them are found to be extremely radio-loud with radio loudness parameter ( R _1.4 GHz ) > 100.
Veeresh Singh, Parveen Kumar, Avik Kumar Das, Vineet Ojha   +3 more
doaj   +1 more source

A Search for Blazar-Like Radio-Loud Narrow-Line Seyfert 1 Galaxies

Galaxies, 2017
We report the results of an observational program to investigate the gamma-ray and optical variability properties of the vRL NLSY1 galaxies listed in the Yuan et al. sample. We have identified 17 members of the Yuan et al. sample possibly associated with
Hugh R. Miller, Jeremy D. Maune, Joseph R. Eggen, Clay S. Turner, Elizabeth C. Ferrara, Diana O. Gudkova, Amy M. Battles   +6 more
doaj   +1 more source

Polypept(o)ide‐Based Core–Shell Bottlebrush Polymers: A Versatile Platform for Drug Encapsulation

Macromolecular Bioscience, Volume 25, Issue 7, July 2025.
This study developed polypept(o)ide‐based core–shell brushes (CSBs) with tunable sizes (Rh: 17–70 nm) for hydrophobic drug delivery. CSBs achieved 10% dasatinib loading through π–π interactions, enabling sustained release over 72 h. Notably, CSB‐dasatinib complexes showed comparable cell viability reduction to the free drug in U‐87 MG cells ...
Bonan Zhao, Jingyuan Wei, Rüdiger Berger, Lin Jian, Kaloian Koynov, Heyang Zhang, Matthias Barz   +6 more
wiley   +1 more source

Constraining X-Ray Variability of the Blazar 3C 273 Using XMM-Newton Observations over Two Decades

The Astrophysical Journal, 2023
Blazars exhibit relentless variability across diverse spatial and temporal frequencies. The study of long- and short-term variability properties observed in the X-ray band provides insights into the inner workings of the central engine.
Adithiya Dinesh, Gopal Bhatta, Tek P. Adhikari, Maksym Mohorian, Niraj Dhital, Suvas C. Chaudhary, Radim Pánis, Dariusz Góra   +7 more
doaj   +1 more source

Feasibility of a real‐time dual energy markerless monitoring of lung tumors using a clinical room‐mounted stereoscopic and monoscopic x‐ray imaging system

Medical Physics, Volume 52, Issue 7, July 2025.
Abstract Background The motion of lung tumors during breathing poses challenges in stereotactic body radiotherapy (SBRT), warranting improved monitoring techniques. Breathing complicates SBRT by creating positional uncertainty in the lungs, traditionally managed with PTV margins, respiratory gating, or breath hold, each with significant drawbacks ...
Zakary McLure, Chris Peacock, Mike Sattarivand   +2 more
wiley   +1 more source

Modeling Blazar Broadband Emission with Convolutional Neural Networks. II. External Compton Model

The Astrophysical Journal
In the context of modeling spectral energy distributions (SEDs) for blazars, we extend the method that uses a convolutional neural network (CNN) to include external inverse Compton processes.
N. Sahakyan, D. Bégué, A. Casotto, H. Dereli-Bégué, P. Giommi, S. Gasparyan, V. Vardanyan, M. Khachatryan, A. Pe’er   +8 more
doaj   +1 more source

Baldwin Effect and Additional BLR Component in AGN with Superluminal Jets

Frontiers in Astronomy and Space Sciences, 2016
We study the Baldwin Effect (BE) in 96 core-jet blazars with optical and ultraviolet spectroscopic data from a radio-loud AGN sample obtained from the MOJAVE 2cm survey.
Víctor Manuel Patiño Álvarez, Janet eTorrealba, Vahram eChavushyan, Irene eCruz González, Tigran eArshakian, Tigran eArshakian, Jonathan eLeón Tavares, Luka ePopovic   +7 more
doaj   +1 more source

Probing the Heart of Active Narrow-line Seyfert 1 Galaxies with VERA Wideband Polarimetry

The Astrophysical Journal, 2023
We explored the parsec-scale nuclear regions of a sample of radio-loud narrow-line Seyfert 1 galaxies (NLSy1s) using the VLBI Exploration of Radio Astrometry wideband (at a recording rate of 16 Gbps) polarimetry at 22 and 43 GHz.
Mieko Takamura, Kazuhiro Hada, Mareki Honma, Tomoaki Oyama, Aya Yamauchi, Syunsaku Suzuki, Yoshiaki Hagiwara, Monica Orienti, Filippo D’Ammando, Jongho Park, Minchul Kam, Akihiro Doi   +11 more
doaj   +1 more source

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Radio Counterparts of Ultraluminous X-Ray Sources in Nearby Galaxies

The Astrophysical Journal
Radio surveys of ultraluminous X-ray sources (ULXs) allow us to find supercritically accreting compact objects (SS 433/W50-like systems) or stripped nuclear black holes in nearby galaxies. We identified 21 such objects by crossmatching a ULX catalog with
Yijia Zhang, Hua Feng, Ailing Wang, Roberto Soria   +3 more
doaj   +1 more source