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The Origin of Multi-TeV Gamma-rays in LHAASO J0341+5258 via Cosmic Ray Illumination of Molecular Clouds
Abhijit Roy, Alan Sunny, Martina Cardillo +2
We investigate the origin of the ultra-high-energy -ray emission detected by the Large High Altitude Air Shower Observatory (LHAASO) from the source LHAASO J0341+5258, which has…
Dissecting the radiation mechanism of short GRB~160821B through multi-wavelength modelling
Ankur Ghosh, Monica Barnard, Jagdish C. Joshi +1
GRB~160821B is the only short GRB detected to date at very high energy (VHE, GeV). At a redshift , it was detected by MAGIC telescopes approximately four hou…
Modelling multiwavelength afterglows of the VHE-GRB population
Monica Barnard, Ankur Ghosh, Jagdish C. Joshi +1
The recent detection of very high energy (VHE, 100 GeV) -ray emission from gamma-ray bursts (GRBs) has provided new insights into afterglow physics. Understanding the…
Spatio-spectral-temporal Modelling of Two Young Pulsar Wind Nebulae
A. Kundu, Jagdish C. Joshi, C. Venter +5
Recent observations of a few young pulsar wind nebulae (PWNe) have revealed their morphologies in some detail. Given the availability of spatio-spectral-temporal data, we use our m…
Very high-energy gamma rays from GRB 180720B and GRB 190829A with external Compton emission
Monica Barnard, Soebur Razzaque, Jagdish C. Joshi
Gamma-ray bursts (GRBs) comprise of short, bright, energetic flashes of emission from extragalactic sources followed by a longer afterglow phase of decreased brightness. Recent dis…
Interpreting the GeV-TeV Gamma-Ray Spectra of Local Giant Molecular Clouds using GEANT4 Simulation
Abhijit Roy, Jagdish C. Joshi, Martina Cardillo +1
Recently, the Fermi-LAT gamma-ray satellite has detected six Giant Molecular Clouds (GMCs) located in the Gould Belt and the Aquila Rift regions. In half of these objects (Taurus,…
Probing LHAASO Galactic PeVatrons through gamma-ray and neutrino correspondence
Prantik Sarmah, Sovan Chakraborty, Jagdish C. Joshi
Recently, Large High Altitude Air Shower Observatory (LHAASO) has detected several Galactic point sources of ultra high energy (UHE; TeV) gamma-rays. These gamma-rays ar…
Study of maximum electron energy of sub-PeV pulsar wind nebulae by multiwavelength modelling
Jagdish C. Joshi, Shuta J. Tanaka, Luis Salvador Miranda +1
Recently, the Large High Altitude Air Shower Observatory (LHAASO) reported the discovery of 12 ultrahigh-energy (UHE; TeV) gamma-ray sources located…
Testing high energy neutrino emission from the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) sources
Antonio Galván, Nissim Fraija, Edilberto Aguilar-Ruiz +3
The detection of the high-energy neutrino IC-170922A in spatial (within the error region) and temporal flare activity correlation with the blazar TXS 0506+056 allowed these objects…
GRB 140102A: Insight into Prompt Spectral Evolution and Early Optical Afterglow Emission
Rahul Gupta, S. R. Oates, S. B. Pandey +38
We present and perform a detailed analysis of multi-wavelength observations of \thisgrb, an optical bright GRB with an observed reverse shock (RS) signature. Observations of this G…
Cosmic rays, neutrinos and GeV-TeV gamma rays from Starburst Galaxy NGC 4945
E. Aguilar-Ruiz, N. Fraija, Jagdish C. Joshi +2
The detection of high-energy astrophysical neutrinos and ultra-high-energy cosmic rays (UHECRs) provides a new way to explore sources of cosmic rays. One of the highest energy neut…
GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare?
Jun Yang, Vikas Chand, Bin-Bin Zhang +16
The giant flares of soft gamma-ray repeaters (SGRs) have long been proposed to contribute to at least a subsample of the observed short gamma-ray bursts (GRBs). In this paper, we p…
Magnetar Giant Flare Originated GRB 200415A: Transient GeV emission, Time-Resolved Correlation, and Implications
Vikas Chand, Jagdish C. Joshi, Rahul Gupta +12
Giant flares (GFs) are unusual bursts from soft gamma-ray repeaters (SGRs) that release an enormous amount of energy in a fraction of a second. The afterglow emission of these SGR-…
Examining the secondary product origin of cosmic ray positrons with the latest AMS-02 data
Zhi-Qiu Huang, Ruo-Yu Liu, Jagdish C. Joshi +1
Measurements of cosmic-ray (CR) positron fraction by PAMELA and other experiments have found an excess above 10 GeV relative to the standard predictions for secondary production in…
Peculiar prompt emission and afterglow in H.E.S.S. detected GRB 190829A
Vikas Chand, Ankush Banerjee, Rahul Gupta +10
We present the results of a detailed investigation of the prompt and afterglow emission in the HESS detected GRB 190829A. Swift and Fermi observations of the prompt phase of this G…
Modelling synchrotron and synchrotron self-Compton emission of gamma-ray burst afterglows from radio to very-high energies
Jagdish C. Joshi, Soebur Razzaque
Synchrotron radiation from a decelerating blastwave is a widely accepted model of radio to X-ray afterglow emission from gamma-ray bursts (GRBs). GeV gamma-ray emission detected by…
Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A
Jagdish C. Joshi, Luis Salvador Miranda, Soebur Razzaque +1
The association of at least a dozen ultrahigh-energy cosmic-ray (UHECR) events with energy EeV detected by the Pierre Auger Observatory (PAO) from the direction of Cen…
A self-consistent model of cosmic-ray fluxes and positron excess: Roles of nearby pulsars and a sub-dominant source population
Jagdish C. Joshi, Soebur Razzaque
The cosmic-ray positron flux calculated using the cosmic-ray nuclei interactions in our Galaxy cannot explain observed data above 10 GeV. An excess in the measured positron flux is…
Photodisintegrated gamma rays and neutrinos from heavy nuclei in the gamma-ray burst jet of GRB 130427A
Jagdish C. Joshi, Soebur Razzaque, Reetanjali Moharana
Detection of ~ 0.1-70 GeV prompt gamma-ray emission from the exceptionally bright gamma-ray burst (GRB) 130427A by the Fermi-Large Area Telescope provides an opportunity to explore…
Cosmic Ray Antiprotons from Nearby Cosmic Accelerators
Jagdish C. Joshi, Nayantara Gupta
The antiproton flux measured by PAMELA experiment might have originated from Galactic sources of cosmic rays. These antiprotons are expected to be produced in the interactions of c…
How Many of the Observed Neutrino Events Can Be Described by Cosmic Ray Interactions in the Milky Way?
Jagdish C. Joshi, Walter Winter, Nayantara Gupta
Cosmic rays diffuse through the interstellar medium and interact with matter and radiations as long as they are trapped in the Galactic magnetic field. The IceCube experiment has d…
Testing Hadronic Models of Gamma Ray Production at the Core of Cen A
Jagdish C. Joshi, Nayantara Gupta
Pierre Auger experiment has observed a few cosmic ray events above 55 EeV from the direction of the core of Cen A. These cosmic rays might have originated from the core of Cen A. H…