Enhanced Detectability of Very-High-Energy Gamma Rays from Off-Axis Short Gamma-Ray Bursts: Impacts of Structured Jets and External Inverse-Compton Scattering

Classés selon la proximité de leur titre et de leur résumé avec ceux de cet article. Sélectionnez-en pour les lire ensemble.

Les articles les plus proches

1. Proche Données, outil ou méthode en commun Pas pertinent

   Detection prospects of Very and Ultra High-Energy gamma rays from extended sources with ASTRI, CTA, and LHAASO

   Silvia Celli, Giada Peron · 2024 · High Energy Astrophysical Phenomena · cité 11 fois · Résumé IA disponible

   Cette étude estime la détectabilité des sources gamma étendues avec ASTRI, CTA et LHAASO, tandis que l’article évalue les sursauts gamma avec CTAO.

   Résumé scientifique

   Context. The recent discovery of several ultra high-energy gamma-ray emitters in our Galaxy constitutes a significant advancement towards unveiling its most powerful accelerators and their properties. Nonetheless, in order to unambiguously locate the regions where the highest energy particles are produced and understand the responsible physical mechanisms, detailed spectral and morphological studies are required, especially given that most of the observed sources were found to be significantly extended. Aims. In these regards, pointing observations with the next-generation Imaging Atmospheric Cherenkov Telescopes, like the Cherenkov Telescope Array (CTA) Observatory and the ASTRI Mini-Array …

2. Proche Même question Pas pertinent

   Lepto-Hadronic Scenarios for TeV Extensions of Gamma-Ray Burst Afterglow Spectra

   Marc Klinger, Chengchao Yuan, Andrew M. Taylor et al. · 2024 · High Energy Astrophysical Phenomena · cité 3 fois · Résumé IA disponible

   Cette étude examine les mécanismes pouvant expliquer les extensions TeV des rémanences de sursauts gamma, comme l’article sur leur émission gamma de très haute énergie.

   Résumé scientifique

   Recent multi-wavelength observations of gamma-ray burst afterglows observed in the TeV energy range challenge the simplest Synchrotron Self-Compton (SSC) interpretation of this emission, and are consistent with a single power-law component spanning over eight orders of magnitude in energy. To interpret this generic behaviour in the single-zone approximation without adding further free parameters, we perform an exhaustive parameter space study using the public, time-dependent, multi-messenger transport software AM3. This description accounts for the radiation from non-thermal protons and the lepto-hadronic cascade induced by pp- and p{\gamma}-interactions. We summarise the main scenarios whic…

3. Proche Contexte plus large Pas pertinent

   First detection of VHE gamma-ray emission from TXS~1515--273, study of its X-ray variability and spectral energy distribution

   MAGIC Collaboration, V. A. Acciari, S. Ansoldi et al. · 2021 · High Energy Astrophysical Phenomena · cité 4 fois · Résumé IA disponible

   Cette étude détecte des rayons gamma de très haute énergie d’un blazar et analyse sa variabilité X, sans porter sur les jets de sursauts gamma.

   Résumé scientifique

   We report here on the first multi-wavelength (MWL) campaign on the blazar TXS 1515-273, undertaken in 2019 and extending from radio to very-high-energy gamma rays (VHE). Up until now, this blazar had not been the subject of any detailed MWL observations. It has a rather hard photon index at GeV energies and was considered a candidate extreme high-synchrotronpeaked source. MAGIC observations resulted in the first-time detection of the source in VHE with a statistical significance of 7.6$\sigma$. The average integral VHE flux of the source is 6 $\pm$ 1% of the Crab nebula flux above 400 GeV. X-ray coverage was provided by Swift-XRT, XMMNewton, and NuSTAR. The long continuous X-ray observations…

4. Proche Contexte plus large Pas pertinent

   VERITAS discovery of very high energy gamma-ray emission from S3 1227+25 and multiwavelength observations

   Atreya Acharyya, Colin Adams, Avery Archer et al. · 2023 · High Energy Astrophysical Phenomena · cité 8 fois · Résumé IA disponible

   Cette étude rapporte une détection gamma de très haute énergie d’un blazar avec VERITAS, plutôt que la prévision d’émission de sursauts gamma hors axe.

   Résumé scientifique

   We report the detection of very high energy gamma-ray emission from the blazar S3 1227+25 (VER J1230+253) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). VERITAS observations of the source were triggered by the detection of a hard-spectrum GeV flare on May 15, 2015 with the Fermi-Large Area Telescope (LAT). A combined five-hour VERITAS exposure on May 16th and May 18th resulted in a strong 13$\sigma$ detection with a differential photon spectral index, $\Gamma$ = 3.8 $\pm$ 0.4, and a flux level at 9% of the Crab Nebula above 120 GeV. This also triggered target of opportunity observations with Swift, optical photometry, polarimetry and radio measurements, also pres…

5. Proche Contexte plus large Pas pertinent

   Electromagnetic Counterparts Powered by Kicked Remnants of Black Hole Binary Mergers in AGN Disks

   Ken Chen, Zi-Gao Dai · 2023 · High Energy Astrophysical Phenomena · cité 30 fois · Résumé IA disponible

   Cette étude modélise des contreparties électromagnétiques de fusions de trous noirs dans des disques AGN, et non l’émission Compton inverse des sursauts gamma.

   Résumé scientifique

   The disk of an active galactic nucleus (AGN) is widely regarded as a prominent formation channel of binary black hole (BBH) mergers that can be detected through gravitational waves (GWs). Besides, the presence of dense environmental gas offers the potential for an embedded BBH merger to produce electromagnetic (EM) counterparts. In this paper, we investigate EM emission powered by the kicked remnant of a BBH merger occurring within the AGN disk. The remnant BH will launch a jet via accreting magnetized medium as it traverses the disk. The resulting jet will decelerate and dissipate energy into a lateral cocoon during its propagation. We explore three radiation mechanisms of the jet cocoon sy…

6. Proche Même question Pas pertinent

   Multiwavelength Analysis of GRB 250101A: From Gamma-ray Prompt Emission to Optical Afterglow

   Guowang Du, Yehao Cheng, Yuan-Pei Yang et al. · 2025 · High Energy Astrophysical Phenomena · cité 4 fois · Résumé IA disponible

   Cette étude analyse l’émission et la rémanence d’un sursaut gamma, mais se concentre sur ses observations multi-longueurs d’onde plutôt que sur l’émission Compton inverse hors axe.

   Résumé scientifique

   Gamma-ray bursts (GRBs) are the most luminous transients in the universe. The interaction between the relativistic jet and the circumburst medium produces a multiwavelength afterglow through synchrotron radiation. In this work, we present multiwavelength properties of GRB~250101A based on the observations of Swift, Fermi, and Multi-channel Photometric Survey Telescope (Mephisto). The spectral analysis of Swift/BAT and Fermi/GBM reveals a soft prompt spectrum with a low-energy photon index of $-1.18$ and a peak energy of 33 keV, and the isotropic energy is $1.4\times10^{52}~{\rm erg}$. The prompt emission of GRB 250101A aligns with Type II GRBs in the Amati relation. Meanwhile, our analysis i…

7. Proche Même question Pas pertinent

   Gamma-Ray Bursts: Evidence for a Common Origin of X-ray Plateaus with Diverse Temporal Decay Index

   Xiao-Fei Dong, Yong-Feng Huang, Chen Deng et al. · 2026 · High Energy Astrophysical Phenomena · cité 1 fois · Résumé IA disponible

   Cette étude cherche l’origine des plateaux X des sursauts gamma, photons que l’article considère comme graines de diffusion Compton inverse externe.

   Résumé scientifique

   A significant fraction of gamma-ray bursts (GRBs) exhibit a plateau in the early X-ray afterglow light curve, whose mechanism remains uncertain. While the post-plateau normal decay index ($α_2$) is commonly used to constrain the afterglow dynamics, the shallow-decay slope of the plateau itself ($α_1$) has received comparatively little attention. Recent observations, however, reveal substantial dispersion in $α_1$, raising the question of whether GRBs with rising, flat and mildly decaying plateaus represent intrinsically distinct populations. To address this question, we collect a uniform sample of 185 $\textit{Swift}$ GRBs with a well-defined plateau and divide them into three groups based o…

8. Proche Contexte plus large Pas pertinent

   Diffuse Ultra-High-Energy Gamma-Ray Emission From TeV Halos

   Ariane Dekker, Ian Holst, Dan Hooper et al. · 2023 · High Energy Astrophysical Phenomena · cité 11 fois · Pas encore résumé

   Cette étude interprète l’émission diffuse galactique de très haute énergie par des halos de pulsars, sans traiter les sursauts gamma ni leurs jets.

   Résumé scientifique

   The LHAASO Collaboration has recently reported a measurement of the diffuse gamma-ray emission from the Galactic Plane at energies between 10 TeV and 1 PeV. While this emission is brighter than that expected from cosmic-ray interactions in the interstellar medium alone, we show that the intensity, spectrum, and morphology of this excess are in good agreement with that predicted from the "TeV halos" which surround the Milky Way's pulsar population. These results support the conclusion that TeV halos dominate the ultra-high-energy sky, and that these objects convert $\sim 5\%$ of their total spindown power into very-high and ultra-high-energy photons.