Incoherent Multi-Wavelength Emission in the Wavelength Range 1500-2100 nm

AbstractAn object called G2 was recently discovered moving towards the supermassive black hole in the Galactic center. G2 emits infrared (IR) lines and continuum, which allows constraining its properties. The question is still unresolved whether G2 has a central windy star or it is a coreless cloud. Assuming the object is a cloud originating near the apocenter I perform line/continuum IR diagnostics, revisit estimates of non-thermal emission from pericenter passage, and speculate about future observational prospects. This work is partially reported in Shcherbakov (2013) and partially consists of new ideas discussed at the conference.

Download Full-text

Applying Monte Carlo methods to model multi-wavelength emission of RMHD jet simulations.

10.22323/1.358.0811 ◽

2019 ◽

Author(s):

Izak van der Westhuizen ◽

Brian van Soelen ◽

Markus Böttcher ◽

Pieter Meintjes

Keyword(s):

Monte Carlo ◽

Monte Carlo Methods ◽

Multi Wavelength ◽

Wavelength Emission

Download Full-text

Exceptionally bright optical emission from a rare and distant gamma-ray burst

10.21203/rs.3.rs-1101440/v1 ◽

2021 ◽

Author(s):

Gor Oganesyan ◽

Sergey Karpov ◽

Martin Jelinek ◽

Gregory Beskin ◽

Samuele Ronchini ◽

...

Keyword(s):

Gamma Ray ◽

Massive Stars ◽

Optical Emission ◽

Gamma Ray Bursts ◽

Additional Component ◽

Relativistic Jets ◽

X Ray ◽

Forward Shock ◽

Multi Wavelength ◽

Wavelength Emission

Abstract Long gamma-ray bursts (GRBs) are produced by the dissipation of ultra-relativistic jets launched by newly-born black holes after the collapse of massive stars. Right after the luminous and highly variable gamma-ray emission, the multi-wavelength afterglow is released by the external dissipation of the jet in circumburst medium. We report the discovery of a very bright (10 mag) optical emission 28 s after the explosion of the extremely luminous and energetic GRB 210619B located at redshift 1.937. Early multi-filter observations allowed us to witness the end of the shock wave propagation into the GRB ejecta. We observed the spectral transition from a bright reverse to the forward shock emission, demonstrating that the early and late GRB multi-wavelength emission is originated from a very narrow jet propagating into an unusually rarefied interstellar medium. We also find evidence of an additional component of radiation, coming from the jet wings which is able explain the uncorrelated optical/X-ray emission.

Download Full-text