Results 11 to 20 of about 113,730 (333)

A 31.3 day Transient Quasiperiodic Oscillation in Gamma-ray Emission from Blazar S5 0716+714 [PDF]

Astrophysical Journal, 2022
We systematically search for quasiperiodic oscillatory (QPO) signals on the month timescale among the 1525 sources given in the Fermi Large Area Telescope Light Curve Repository.
Junping Chen, T. Yi, Yunlu Gong, Xing Yang, Zhihui Chen, X. Chang, L. Mao   +6 more
semanticscholar   +1 more source

Strongly Lensed Transient Sources: A Review [PDF]

Chinese Physics Letters, 2022
The past decades have witnessed a lot of progress in gravitational lensing with two main targets: stars and galaxies (with active galactic nuclei). The success is partially attributed to the continuous luminescence of these sources making the detection ...
Kai 恺 Liao 廖, M. Biesiada, Z. Zhu 朱   +2 more
semanticscholar   +1 more source

Particle Acceleration in Mildly Relativistic Outflows of Fast Energetic Transient Sources [PDF]

Universe, 2022
Recent discovery of fast blue optical transients (FBOTs)—a new class of energetic transient sources—can shed light on the long-standing problem of supernova—long gamma-ray burst connections.
A. Bykov, V. Romansky, S. Osipov
semanticscholar   +1 more source

Constraining the Kilonova Rate with Zwicky Transient Facility Searches Independent of Gravitational Wave and Short Gamma-Ray Burst Triggers [PDF]

Astrophysical Journal, 2020
The first binary neutron star merger, GW170817, was accompanied by a radioactivity-powered optical/infrared transient called a kilonova. To date, no compelling kilonova has been found in all-sky optical surveys, independently of short gamma-ray burst and
I. Andreoni, E. Kool, A. Carracedo, M. Kasliwal, M. Bulla, T. Ahumada, M. Coughlin, S. Anand, J. Sollerman, A. Goobar, D. Kaplan, Tegan T. Loveridge, V. Karambelkar, J. Cooke, A. Bagdasaryan, E. Bellm, S. Cenko, D. Cook, K. De, R. Dekany, A. Delacroix, A. Drake, D. Duev, C. Fremling, V. Golkhou, M. Graham, D. Hale, S. Kulkarni, T. Kupfer, R. Laher, A. Mahabal, F. Masci, B. Rusholme, Roger M. Smith, A. Tzanidakis, A. V. Sistine, Yuhan Yao   +36 more
semanticscholar   +1 more source

On the Properties of Inverse Compton Spectra Generated by Upscattering a Power-law Distribution of Target Photons

The Astrophysical Journal, 2023
Relativistic electrons are an essential component in many astrophysical sources, and their radiation may dominate the high-energy bands. Inverse Compton (IC) emission is the radiation mechanism that plays the most important role in these bands. The basic
Dmitry Khangulyan, Felix Aharonian, Andrew M. Taylor   +2 more
doaj   +1 more source

First constraints on the strength of the extragalactic magnetic field from $\gamma$-ray observations of GRB 221009A [PDF]

, 2023
The extragalactic magnetic field (EGMF) could be probed with $\gamma$-ray observations of distant sources. Primary very high energy (VHE) $\gamma$-rays from these sources absorb on extragalactic background light photons, and secondary electrons/positrons
T. Dzhatdoev, E. Podlesnyi, G. Rubtsov
semanticscholar   +1 more source

Peculiar X-ray transient SRGA J043520.9+552226/AT2019wey discovered with SRG/ART-XC [PDF]

Astronomy & Astrophysics, 2021
Context. During its ongoing all-sky survey, the Mikhail Pavlinsky ART-XC (Astronomical Roentgen Telescope – X-ray Concentrator) telescope on board the Spectrum-Roentgen-Gamma (SRG) observatory is set to discover new X-ray sources, many of which can be ...
I. Mereminskiy, A. Dodin, A. Lutovinov, A. N. Semena, V. Arefiev, K. Atapin, A. Belinski, R. Burenin, M. Burlak, M. Eselevich, A. A. Fedotieva, M. Gilfanov, N. Ikonnikova, R. Krivonos, I. Lapshov, A. Lyapin, P. Medvedev, S. Molkov, K. Postnov, M. S. Pshirkov, S. Sazonov, N. Shakura, A. Shtykovsky, R. Sunyaev, A. Tatarnikov, A. Tkachenko, S. Ras, Moscow, Russia., Sternberg Astronomical Institute, M. University, I. O. A. P. Ras, Irkutsk, Max-Planck Institute for Astrophysics, Garching, H Germany   +35 more
semanticscholar   +1 more source

Evidence for Two Distinct Populations of Kilonova-associated Gamma-Ray Bursts

The Astrophysical Journal Letters, 2023
Identification of gamma-ray burst (GRB) progenitors based on the duration of their prompt emission ( T _90 ) has faced several roadblocks recently. Long-duration GRBs (with T _90 > 2 s) have traditionally been thought to be originating from the collapse ...
Dimple, K. Misra, K. G. Arun
doaj   +1 more source

Estimation of the detected background by the future gamma ray transient mission CAMELOT [PDF]

Astronomical Notes - Astronomische Nachrichten, 2019
This study presents a background estimation for the CubeSats Applied for MEasuring and LOcalising Transients (CAMELOT), which is a proposed fleet of nanosatellites for the all-sky monitoring and timing-based localization of gamma ray transients with ...
Jakub Řípa, Jakub Řípa, G. Galgóczi, Norbert Werner, Norbert Werner, Norbert Werner, A. Pál, M. Ohno, L. Mészáros, T. Mizuno, Norbert Tarcai, Kento Torigoe, N. Uchida, Y. Fukazawa, H. Takahashi, K. Nakazawa, Naoyoshi Hirade, Kengo Hirose, Syohei Hisadomi, T. Enoto, H. Odaka, Y. Ichinohe, Z. Frei, László L. Kiss   +23 more
semanticscholar   +1 more source

Detectability of “Merger-nova” Emission from a Long-lived Magnetar in Short Gamma-Ray Bursts [PDF]

Astrophysical Journal, 2021
One possible progenitor of short gamma-ray bursts (GRBs) is thought to be from a double neutron star (NS) merger, and the remnant of such a merger may be a supramassive NS, which is supported by rigid rotation and through its survival of hundreds of ...
Yong Yuan, H. Lü, Haotian Yuan, Shuai-Bing Ma, W. Lei, E. Liang   +5 more
semanticscholar   +1 more source