15 citations · 30 across the 22 of their papers we have counts for
23 papers
Evidence for a spectral steepening of the gamma-ray emission from the Galactic Center ridge
A. Acharyya, F. Aharonian, H. Ashkar +130
Very-high-energy (VHE) -ray emission detected from the central molecular zone (CMZ) hints at diffusive propagation of cosmic rays (CRs) injected continuously near the Galactic c…
AI-Assisted Extraction of Follow-up Observations from GCN Circulars in Astro-COLIBRI
Fabian Schüssler, S. Bisero, M. Cellier +6
We present a new Astro-COLIBRI component that converts free-text GCN Circulars into structured, event-linked follow-up records and combines them with structured reports submitted d…
NMMA-Astro-COLIBRI: An Automated Light-Curve Supernovae Classification Service in the Multi-Survey Era
R. Weizmann Kiendrebeogo, Bernardo Cornejo Avila, Sofia Bisero +6
The surge in publicly available photometric alerts from wide-field surveys requires automated tools for real-time transient classification. We present NMMA--Astro-COLIBRI, an on-de…
Gamma-Ray Constraints on Heavy Axion-Like-Particle Decays from Fermi-LAT and H.E.S.S. Blazar Spectra
A. Acharyya, F. Aharonian, M. Backes +117
The propagation of very-high-energy (VHE; GeV) gamma rays from extragalactic sources is affected by interactions with photons of the extragalactic background light (…
Search for long-term variability of HESS J1745-290
H. E. S. S. Collaboration, :, A. Acharyya +116
At the center of our Galaxy lies the bright γ-ray point-like source HESS J1745-290, which is compatible in position with Sgr A star, although an association between the two remains…
Enabling real-time multi-messenger follow-up of transient events with Astro-COLIBRI
Bernardo Cornejo Avila, Sofia Bisero, Mickäel Costa +4
Time-domain astrophysics is a rapidly growing field focused on the study of transient phenomena such as Gamma-Ray Bursts (GRBs), Fast Radio Bursts (FRBs), supernovae, novae, and AG…
Chasing Gamma-Ray Signals from Binary Neutron Star Coalescences with the Cherenkov Telescope Array: Prospects and Observing Strategies
S. Abe, J. Abhir, A. Abhishek +457
The detection of gravitational waves (GWs) from a binary neutron star (BNS) merger by Advanced LIGO and Advanced Virgo (GW170817), together with its electromagnetic counterpart, th…
The second H.E.S.S. gamma-ray burst catalogue: 15 years of observations with the H.E.S.S. telescopes
A. Acharyya, F. Aharonian, C. Arcaro +143
Recent observational efforts using imaging atmospheric Cherenkov telescopes (IACTs) have led to firm detections of very-high-energy (VHE) signals from bright gamma-ray bursts (GRBs…
H.E.S.S. detection of the PSR J0855-4644 nebula
F. Aharonian, H. Ashkar, M. Backes +131
HESS J0852-463 is a TeV γ-ray source located in the Galactic plane. The region consists of a supernova remnant (SNR, RX J0852.0-4622) with a shell-like morphology, commonly referre…
Astro-COLIBRI: An Innovative Platform for Real-Time Multi-Messenger Astrophysics
Bernardo Cornejo Avila, Sofia Bisero, Mickael Costa +4
The discovery of transient phenomena, such as supernovae, novae, Fast Radio Bursts (FRBs), Gamma-Ray Bursts (GRBs), and stellar flares, together with the emergence of new cosmic me…
Multi-Messenger Studies with High-Energy Neutrinos and Gamma Rays: The WST Opportunity
Fabian Schüssler, Sofia Bisero, Bernardo Cornejo +5
The search for the sources of ultra-high-energy cosmic rays (UHECRs) using high-energy neutrinos represents a frontier in high-energy astrophysics. However, a critical bottleneck r…
Constraining the nature of the most extreme Galactic particle accelerator. H.E.S.S. observations of the microquasar V4641 Sgr
A. Acharyya, F. Aharonian, H. Ashkar +131
Microquasars have emerged as promising candidates to explain the cosmic-ray flux at petaelectronvolt energies. LHAASO observations revealed V4641~Sgr as the most extreme example so…
The H.E.S.S. Gravitational Wave and Gamma-Ray Burst Follow-Up Programs
Bernardo Cornejo, Halim Ashkar, Matteo Cerruti +4
Multi-wavelength and multi-messenger astrophysics have experienced rapid growth over the past decade, seeking a complete picture of different cosmic phenomena. Transient sources, i…
Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory
K. Abe, S. Abe, J. Abhir +491
The dwarf spheroidal galaxies (dSphs) orbiting the Milky Way are widely regarded as systems supported by velocity dispersion against self-gravity, and as prime targets for the sear…
Astro-COLIBRI: Empowering Citizen Scientists in Multi-Messenger Astrophysics
Fabian Schüssler, B. Cornejo, M. Costa +2
In the era of real-time astronomy, citizen scientists play an increasingly important role in the discovery and follow-up of transient astrophysical phenomena. From local astronomic…
Astro-COLIBRI: A Comprehensive Platform for Real-Time Multi-Messenger Astrophysics
Fabian Schüssler, B. Cornejo, M. Costa +2
The detection of transient phenomena such as Gamma-Ray Bursts (GRBs), Fast Radio Bursts (FRBs), stellar flares, novae, and supernovae, alongside novel cosmic messengers like high-e…
Follow-up on the Supermassive Black Hole Binary Candidate J1048+7143: Successful Prediction of the Next Gamma-ray Flare and Refined Binary Parameters in the Framework of Jet Precession Model
Emma Kun, Ilja Jaroschewski, Julia Becker Tjus +6
Analyzing single-dish and VLBI radio, as well as \textit{Fermi}-LAT -ray observations, we explained the three major flares in the -ray light curve of FSRQ J1048+7143 with the…
Neutrino Emissions of TXS 0506+056 caused by a Supermassive Binary Black Hole Inspiral?
Ilja Jaroschewski, Julia Becker Tjus, Armin Ghorbanietemad +3
The IceCube neutrino observatory detected two distinct flares of high-energy neutrinos from the direction of the blazar TXS 0506+056: a TeV single neutrino on September…
Multimessenger Picture of J1048+7143
Emma Kun, Ilja Jaroschewski, Armin Ghorbanietemad +11
We draw the multimessenger picture of J1048+7143, a flat-spectrum radio quasar known to show quasi-periodic oscillations in the -ray regime. We generate the adaptively-binned Fe…
Extragalactic neutrino emission induced by Supermassive and Stellar Mass Black Hole mergers
Ilja Jaroschewski, Julia Becker Tjus, Peter L. Biermann
The recent detections of binary stellar mass black hole mergers by the LIGO and Virgo Collaborations suggest that such mergers are common occurrences. Galaxy mergers further indica…
Neurino Cadence of TXS~0506+056 Consistent with Supermassive Binary Origin
J. Becker Tjus, I. Jaroschewski, A. Ghorbanietemad +3
On September 18, 2022, an alert by ceCube indicated that a ~170TeV neutrino arrived in directional coincidence with the blazar TXS 0506+056. This event adds to two previous ones: a…
Propagation of cosmic rays in plasmoids of AGN jets -- implications for multimessenger predictions
J. Becker Tjus, M. Hörbe, I. Jaroschewski +4
After the successful detection of cosmic high-energy neutrinos, the field of multiwavelength photon studies of active galactic nuclei (AGN) is entering an exciting new phase. The f…
Cosmic-ray transport in blazars: diffusive or ballistic propagation?
P. Reichherzer, J. Becker Tjus, M. Hörbe +4
The detection of a PeV high-energy neutrino of astrophysical origin, observed by the IceCube Collaboration and correlated with a 3 significance with Fermi measurements to the ga…