Results 161 to 170 of about 16,732,055 (288)

Pulse-resolved Classification and Characteristics of Long-duration Gamma-Ray Bursts with Swift-BAT Data. II. Main Bursts versus Extended Emissions

The Astrophysical Journal Supplement Series
Long gamma-ray bursts (GRBs) frequently exhibit complex prompt-emission morphology, including a bright main-emission (ME) episode followed by a weaker extended-emission (EE) component.
Liang Li, Xiao Wang, Zhi-Li Cui, Cheng-Long Xiao, Wen Li, Yu Wang, Zi-Gao Dai, Rong-Gen Cai   +7 more
doaj   +1 more source

Zero‐Valent Nickel Stabilized in Surface‐Supported Metal–Organic Chains

Angewandte Chemie International Edition, EarlyView.
9,10‐Dicyanoanthracene coordinates Ni atoms on Ag(100) to form metal–organic chains that stabilize zero‐valent Ni(0) (d10) centers with quasi‐one‐dimensional metal–ligand electronic coupling. ABSTRACT The stabilization of zero‐valent nickel Ni(0) centers in extended coordination networks remains a major challenge due to their pronounced reactivity and ...
Simone Mearini, Dominik Brandstetter, Mira S. Arndt, Olga Resel, Daniel Baranowski, Yan Yan Grisan Qiu, Peter Puschnig, Martin Sterrer, Giovanni Zamborlini, Vitaliy Feyer, Claus M. Schneider   +10 more
wiley   +1 more source

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

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

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

Investigation of Stray‐Light Patterns in the eROSITA X‐Ray Cameras

Astronomische Nachrichten, EarlyView.
ABSTRACT eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the soft X‐ray instrument aboard the Spectrum‐Roentgen‐Gamma (SRG) mission, developed under the responsibility of the Max Planck Institute for Extraterrestrial Physics (MPE).
Veronika Stieglitz, Peter Friedrich, Susanne Friedrich, Konrad Dennerl, Michael Freyberg   +4 more
wiley   +1 more source

Could the Interband Lag of Active Galactic Nucleus Vary Randomly?

The Astrophysical Journal
The interband lags among the optical broad-band continua of active galactic nuclei (AGNs) have been intensively explored over the past decade. However, the nature of the lags remains under debate.
Zhen-Bo Su, Zhen-Yi Cai, Jun-Xian Wang, Tinggui Wang, Yongquan Xue, Min-Xuan Cai, Lulu Fan, Hengxiao Guo, Zhicheng He, Zizhao He, Xu-Fan Hu, Ji-an Jiang, Ning Jiang, Wen-Yong Kang, Lei Lei, Guilin Liu, Teng Liu, Zhengyan Liu, Zhenfeng Sheng, Mouyuan Sun, Wen Zhao   +20 more
doaj   +1 more source

Influence of Dynamical Friction on the Unstable Manifolds of Lagrange Points in Barred Galaxies

Astronomische Nachrichten, EarlyView.
ABSTRACT Some time ago the idea has been proposed that rings and spirals in barred galaxies are shaped by the unstable manifolds of the Lagrange points sitting near the ends of the bar. The topic of the present article is an investigation of whether the numerical support for this suggestion can be improved by the inclusion of dynamical friction into ...
Christof Jung
wiley   +1 more source

Interband Lag Variability in Active Galactic Nuclei across Zwicky Transient Facility Data from Multiple Years

The Astrophysical Journal
Interband lags in the optical continua of active galactic nuclei (AGNs) have been observed over years of monitoring, yet their physical origins remain unclear.
Zhen-Bo Su, Zhen-Yi Cai, Hengxiao Guo, Mouyuan Sun, Jun-Xian Wang   +4 more
doaj   +1 more source

Direct SMBH Formation Driven by Runaway Stellar Collisions in Globally Unstable Stellar Systems

Astronomische Nachrichten, EarlyView.
ABSTRACT The fueling problem addresses the ultimate fate of the reservoirs of gas and stars driven into the deepest gravitational potential wells of galaxies, thus it may contain the Universe's densest concentrations of gas and stars. This raises a key question: does the infalling material collapse directly into a supermassive black hole, or can it ...
Marcelo C. Vergara, Andrés Escala
wiley   +1 more source