30 citations · 148 across the 27 of their papers we have counts for
28 papers
Constraints on the VHE counterpart of two binary black hole mergers observed by the MAGIC and CTAO LST-1 telescopes
K. Abe, S. Abe, J. Abhir +358
We present very-high-energy gamma-ray observations of two binary black hole merger candidates, GW240615_113620 and GW241125_010116, performed with the Major Atmospheric Gamma Imagi…
Detection of the distant quasar OP 313 with the first Large-Sized Telescope of CTAO
K. Abe, S. Abe, J. Abhir +412
In December 2023, the Large-Sized Telescope prototype (LST-1) detected for the first time VHE -ray emission from the FSRQ OP~313 becoming the furthest blazar ever observed at VH…
Long-term study of the gamma-ray emission of Cygnus X-3 with MAGIC and Fermi-LAT
K. Abe, S. Abe, J. Abhir +185
Cygnus X-3 is a microquasar composed of a compact object of unknown nature closely orbiting around a Wolf-Rayet star. The particularities of this source make it a unique case among…
A common four-beam geometry reveals altitude-stratified GeV pulses in canonical young pulsars
Paul K. H. Yeung, Takayuki Saito
Despite the diversity and energy dependence of -ray pulse morphologies in Crab, Vela and Dragonfly, the phaseograms of these three canonical young pulsars can be organised withi…
Extreme Blazars Observed with MAGIC: Second Catalog Release
K. Abe, S. Abe, J. Abhir +353
Extremely high-peaked BL Lac objects - also named extreme blazars - are among the most energetic and persistent extragalactic accelerators in the Universe, defined by a synchrotron…
Prompt Searches for Very-High-Energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts
J. Abhir, A. Biland, K. Brand +817
The search for sources of high-energy astrophysical neutrinos can be significantly advanced through a multi-messenger approach, which seeks to detect the gamma rays that accompany…
CTAO LST-1 observations of magnetar SGR 1935+2154: Deep limits on sub-second bursts and persistent tera-electronvolt emission
K. Abe, S. Abe, A. Abhishek +333
The Galactic magnetar SGR 1935+2154 has exhibited prolific high-energy (HE) bursting activity in recent years. Investigating its potential tera-electronvolt counterpart could provi…
Time-Dependent Modeling of the Sub-Hour Spectral Evolution During the 2013 Outburst of Mrk 421
MAGIC Collaboration, K. Abe, S. Abe +192
In April 2013, the TeV blazar Markarian~421 underwent one of its most powerful emission outbursts to date. An extensive multi-instrument campaign featuring MAGIC, VERITAS, and \tex…
Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor. Multiwavelength observations and analysis of the progenitor
The CTAO-LST Project, :, K. Abe +332
We present very high-energy optical photometry and spectroscopic observations of SN 2024bch in the nearby galaxy NGC 3206 (\sim 20 Mpc). We used gamma-ray observations performed wi…
A mechanism-independent methodology for modeling γ-ray phaseograms of pulsars in the framework of north-south symmetry
Paul K. H. Yeung, Dmitry Khangulyan, Takayuki Saito
Fermi-LAT observations revealed that each GeV phase-folded light-curve (aka. phaseogram) of the Crab, Geminga, Dragonfly and Vela pulsars consists of two pulses (P1 & P2) and a "Br…
Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes
S. Abe, J. Abhir, A. Abhishek +206
Gamma-ray bursts (GRBs) are the most powerful transient objects in the Universe, and they are a primary target for the MAGIC Collaboration. Recognizing the challenges of observing…
GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts
LST Collaboration, K. Abe, S. Abe +328
GRB 221009A is the brightest gamma-ray burst (GRB) observed to date. Extensive observations of its afterglow emission across the electromagnetic spectrum were performed, providing…
A detailed study of the very-high-energy Crab pulsar emission with the LST-1
CTA-LST Project, :, K. Abe +294
Context: There are currently three pulsars firmly detected by imaging atmospheric Cherenkov telescopes (IACTs), two of them reaching TeV energies, challenging models of very-high-e…
Examining a hadronic -ray scenario for the radiative shell & molecular clouds of the old GeV supernova remnant G298.60.0
Paul K. H. Yeung, Shiu-Hang Lee, Tsunefumi Mizuno +1
Based on the 13.7~yr Fermi-LAT data, Yeung et al. (2023) claimed detection of two -ray sources (Src-NE and Src-NW) associated with the supernova remnant (SNR) G298.60.0, and…
Multiwavelength studies of G298.60.0: An old GeV supernova remnant interacting with molecular clouds
Paul K. H. Yeung, Aya Bamba, Hidetoshi Sano
Hadronic -ray sources associated with supernova remnants (SNRs) can serve as stopwatches for the escape of cosmic rays from SNRs, which gradually develops from highest-energy pa…
Spatially decomposed -ray features surrounding SNR Kes 79 & PSR J1853+0056
Xinbo He, Yudong Cui, Paul K. H. Yeung +3
There have been substantial improvements on Fermi Large Area Telescope (LAT) data and analysis tools since the last analysis on the mid-aged supernova remnant (SNR) Kes 79 (Auchett…
Investigation of gamma-ray variability and glitches of PSR J1420-6048
Lupin C. -C. Lin, H. H. Wang, C. Y. Hui +4
PSR J1420-6048 is a young gamma-ray pulsar with recurrent glitches. Utilizing long-term monitoring data obtained from the Fermi Gamma-ray Space Telescope, we found that PSR J1420-6…
Fermi Large Area Telescope Observations of the Fast-dimming Crab Nebula in 60-600 MeV
Paul K. H. Yeung, Dieter Horns
Context: The Crab pulsar and its nebula are the origin of relativistic electrons which can be observed through their synchrotron and inverse Compton emission. The transition betwee…
Inferring the origins of the pulsed gamma-ray emission from the Crab pulsar with 10-year Fermi LAT data
Paul K. H. Yeung
Context: The Crab pulsar is a bright -ray source detected at photon energies up to 1 TeV. Its phase-averaged and phase-resolved -ray spectra below 10 GeV exhibit expone…
The Energy-dependent -ray Morphology of the Crab Nebula Observed with the Fermi Large Area Telescope
Paul K. H. Yeung, Dieter Horns
The Crab Nebula is a bright emitter of non-thermal radiation across the entire accessible range of wavelengths. The spatial and spectral structures of the synchrotron nebula are we…
Investigation of the High-Energy Emission from the Magnetar-like Pulsar PSR J1119-6127 after the 2016 Outburst
Lupin Chun-Che Lin, Hui-Hui Wang, Kwan-Lok Li +7
PSR J1119-6127 is a radio pulsar that behaved magnetar like bursts, and we performed a comprehensive investigation of this pulsar using the archival high-energy observations obtain…
Leaked GeV CRs from a broken shell: Explaining 9 years Fermi-LAT data of SNR W28
Yudong Cui, Paul K. H. Yeung, P. H. Thomas Tam +1
Supernova remnant (SNR)\,W28 is well known for its classic hadronic scenario, in which the TeV cosmic rays (CRs) released at the early stage of this mid-aged SNR are illuminating n…
A search for energy-dependence of the Kes 73/1E 1841-045 morphology in GeV
Paul K. H. Yeung
While the Kes 73/1E 1841-045 system had been confirmed as an extended GeV source, whether its morphology depends on the photon energy or not deserves our further investigation. Ado…
Gamma-ray Emission of the Kes 73/1E 1841-045 Region Observed with the Fermi Large Area Telescope
Paul K. H. Yeung, Albert K. H. Kong, P. H. Thomas Tam +3
The supernova remnant Kes 73 and/or the magnetar 1E 1841-045 at its center can deposit a large amount of energy to the surroundings and is potentially responsible for particle acce…