Results 121 to 130 of about 148,127 (281)

A Luminous Red Optical Flare and Hard X-Ray Emission in the Tidal Disruption Event AT 2024kmq

The Astrophysical Journal
We present the optical discovery and multiwavelength follow-up observations of AT 2024kmq, a likely tidal disruption event (TDE) associated with a supermassive ( M _BH  ∼ 10 ^8 M _⊙ ) black hole in a massive galaxy at z = 0.192.
Anna Y. Q. Ho, Yuhan Yao, Tatsuya Matsumoto, Genevieve Schroeder, Eric R. Coughlin, Daniel A. Perley, Igor Andreoni, Eric C. Bellm, Tracy X. Chen, Ryan Chornock, Sofia Covarrubias, Kaustav Das, Christoffer Fremling, Marat Gilfanov, K. R. Hinds, Dan Jarvis, Mansi M. Kasliwal, Chang Liu, Joseph D. Lyman, Frank J. Masci, Thomas A. Prince, Vikram Ravi, R. Michael Rich, Reed Riddle, Cassie Sevilla, Roger Smith, Jesper Sollerman, Jean J. Somalwar, Gokul P. Srinivasaragavan, Rashid Sunyaev, Jada L. Vail, Jacob L. Wise, Sol Bin Yun   +32 more
doaj   +1 more source

Large Language Model‐Based Chatbots in Higher Education

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
The use of large language models (LLMs) in higher education can facilitate personalized learning experiences, advance asynchronized learning, and support instructors, students, and researchers across diverse fields. The development of regulations and guidelines that address ethical and legal issues is essential to ensure safe and responsible adaptation
Defne Yigci, Merve Eryilmaz, Ail K. Yetisen, Savas Tasoglu, Aydogan Ozcan   +4 more
wiley   +1 more source

GRB 190114C: Fireball Energy Budget and Radiative Efficiency Revisited

The Astrophysical Journal
The jet composition of gamma-ray bursts (GRBs), as well as how efficiently the jet converts its energy to radiation, are long-standing problems in GRB physics.
Liang Li, Yu Wang
doaj   +1 more source

MoonBEAM: A Beyond Earth-orbit Gamma-ray Burst Detector for Multi-Messenger Astronomy [PDF]

MoonBEAM is a SmallSat concept of deploying gamma-ray detectors in cislunar space to increase gamma-ray burst detections and improve localization precision with the timing triangulation technique.
Hui, Chiumun M.
core   +1 more source

Scalable Platform Enabling Reservoir Computing With Nanoporous Oxide Memristors for Image Recognition and Time Series Prediction

Advanced Intelligent Systems, EarlyView.
The approach of physical in materia computing incorporates parallel computing within the medium itself. A scalable and energy‐efficient, oxide‐based computational platform is realized in form of a nanoporous network of volatile niobium oxide memristors sandwiched between top and bottom metallic electrodes, and then tested for prediction and ...
Joshua Donald, Ben A. Johnson, Amir Mehrnejat, Alex Gabbitas, Arthur G. T. Coveney, Alexander G. Balanov, Sergey Savel’ev, Pavel Borisov   +7 more
wiley   +1 more source

Relativistic Effects and Gamma-Ray Burst Polarization in Power-law Evolution

The Astrophysical Journal Supplement Series
Despite decades of polarization observations and high significance of polarized γ -ray, X-ray, optical, and radio emissions in gamma-ray bursts (GRBs) accumulating in dozens of cases, people have yet to find a consistent scenario for understanding the ...
Liang Li, She-Sheng Xue, Rong-Gen Cai
doaj   +1 more source

The THESEUS Space Mission and the Infrared Telescope Calibration Unit

Astronomische Nachrichten, EarlyView.
ABSTRACT The Transient High‐Energy Sky and Early Universe Surveyor (THESEUS) is an ESA M7 mission concept currently in Phase A, designed to exploit gamma‐ray bursts to probe the early Universe while advancing multi‐messenger and time‐domain astrophysics. To achieve its ambitious goals, THESEUS will combine wide‐band x‐ray and gamma‐ray monitors with an
András Péter Joó, Rebeka Gyöngyi Kiss, Lorenzo Amati, Bendegúz Koncz, Örs Detre, Gyula Zilizi, Zsolt Bagoly, István I. Rácz, Sándor Pintér, L. Viktor Tóth   +9 more
wiley   +1 more source

Emission-line Variable Active Galactic Nuclei at Cosmic Noon from HETDEX

The Astrophysical Journal Supplement Series
We present the first statistical census of emission-line variable active galactic nuclei (EVA) at cosmic noon by combining untargeted and deep Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) spectroscopy with multiepoch spectra from the Sloan ...
Chenxu Liu, Fanchuan Kong, Erin Mentuch Cooper, Dustin Davis, Wei-Jian Guo, Donald P. Schneider, Liang Xu, Karl Gebhardt, Gary J. Hill, Wolfram Kollatschny, Mirko Krumpe, Shiro Mukae, M. C. Powell, Daniel J. Farrow   +13 more
doaj   +1 more source

Ground-based very high energy gamma ray astronomy: Observational highlights [PDF]

It is now more than 20 years since the first ground based gamma ray experiments involving atmospheric Cerenkov radiation were undertaken. The present highlights in observational ground-based very high energy (VHE) gamma ray astronomy and the optimism ...
Turver, K. E.
core   +1 more source

Repeating Nuclear Transients From Repeating Partial Tidal Disruption Events

Astronomische Nachrichten, EarlyView.
ABSTRACT Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months‐to‐years, have been explained as accretion flares from the repeated tidal stripping of a star by an ...
Ananya Bandopadhyay, Eric R. Coughlin, Julia Fancher, C. J. Nixon, Dheeraj R. Pasham   +4 more
wiley   +1 more source