10 citations · 28 across the 11 of their papers we have counts for
11 papers
Testing Narrow-jet Gamma-Ray Bursts as Sources of Ultrahigh-Energy Cosmic Rays
Saikat Das, Soebur Razzaque, Justin D. Finke +1
Gamma-ray bursts (GRBs) have long been considered candidate sources of ultrahigh-energy cosmic rays (UHECRs) due to their large energy release and relativistic outflows. The detect…
TeV-PeV Gamma-ray and Neutrino Emission in the Galactic Plane
Saikat Das, Nayantara Gupta, Siyao Xu
We model the LHAASO observation of diffuse TeV--PeV rays in the Galactic plane as the sum of unresolved leptonic emission from pulsar wind nebulae and hadronic emission from su…
Zooming in on the GeV -ray flare of the blazar PKS 1725+123 with a multimessenger lens
Suvas Chandra Chaudhary, Saikat Das, Raj Prince +1
Blazars are promising sources of extragalactic high-energy astrophysical neutrinos, detected at energies TeV by the IceCube neutrino observatory. Here, we report the f…
Turbulence Mode Decomposition and Anisotropy in Magnetically Dominated Collisionless Plasmas
Samuel T. Sebastian, Siyao Xu, Yue Hu +3
We use the 3D fully kinetic simulation to study different turbulence modes and turbulence anisotropy of relativistic turbulence in magnetically dominated collisionless plasmas. We…
Cosmogenic Origin of KM3-230213A: Delayed Gamma-Ray Emission from A Cosmic-Ray Transient
Sovan Boxi, Saikat Das, Nayantara Gupta
The highest-energy cosmic neutrino detected by the ARCA detector of KM3NeT has reignited the quest to pinpoint the sources of ultrahigh-energy cosmic rays (UHECRs; E…
Design and Fabrication of a lightweight three-lens corrector system for the 2.34-m Vainu Bappu Telescope
Nitish Singh, S. Sriram, Ramya Sethuram +8
The Vainu Bappu Telescope (VBT) is a 2.34-m reflector, primarily supported on-axis field of view, offering high-resolution and low-to-medium resolution spectroscopic observations i…
Cosmic Clues from Amaterasu: Blazar-Driven Ultrahigh-Energy Cosmic Rays?
Saikat Das, Srijita Hazra, Nayantara Gupta
The detection of the Amaterasu event of energy 244 EeV by the Telescope Array, one of the most energetic ultrahigh-energy cosmic rays (UHECRs; EeV) observed to date,…
Modeling the imprints of large-scale magnetized structures on -rays from extragalactic transients
Saikat Das, Soebur Razzaque, Nestor Mirabal +3
In the multimessenger era, the association of high-energy transients with their -ray counterparts can be obscured by magnetized large-scale structure surrounding the source. We…
Cosmic-Ray Constraints on the Flux of Ultra-High-Energy Neutrino Event KM3-230213A
Saikat Das, Bing Zhang, Soebur Razzaque +1
The detection of a ~PeV muon neutrino event by the KM3NeT telescope offers an unprecedented opportunity to probe the Universe at extreme energies. A photopion interactio…
Composite asymmetric dark matter with a dark photon portal: Multimessenger tests
Saikat Das, Ayuki Kamada, Takumi Kuwahara +2
Composite asymmetric dark matter (ADM) is the framework that naturally explains the coincidence of the baryon density and the dark matter density of the Universe. Through a portal…
Probing superheavy dark matter through lunar radio observations of ultrahigh-energy neutrinos and the impacts of neutrino cascades
Saikat Das, Jose Alonso Carpio, Kohta Murase
Ultrahigh-energy neutrinos (UHEs) can be used as a valuable probe of superheavy dark matter above GeV, the latter being difficult to probe with collider and direct d…