Bulk lorentz factors of gamma-ray bursts
WebNov 10, 2012 · The U.S. Department of Energy's Office of Scientific and Technical Information WebNov 16, 2024 · Abstract: Knowledge of the bulk Lorentz factor $\Gamma_{0}$ of GRBs allows us to compute their comoving frame properties shedding light on their physics. …
Bulk lorentz factors of gamma-ray bursts
Did you know?
WebApr 10, 2024 · A long-duration gamma-ray burst (GRB) is produced by the collapse of a massive star into a black hole or a rapidly spinning, highly magnetized neutron star, with enormous energy emitted in the ... WebIf gamma ray bursts are highly collimated, radiating into only a small fraction of the sky, the energy requirements of each event may be reduced by several (up to 4–6) orders of …
WebOct 25, 2016 · It is largely recognized that Gamma-Ray Burst (GRB) jets involve ultra-relativistic motion. However, the value of the Lorentz factor Gamma_0 is still not clear and only lower limits are known for most bursts. We suggest here a new method to obtain upper limits on Gamma_0. The early high-energy synchrotron afterglow flux depends strongly … WebSep 27, 2016 · The most extreme variability, as well as brightness temperatures ~100 times the inverse Compton limit, probably require occasional exceptionally high bulk Lorentz factors. These can result, for example, from supersonic, relativistic turbulence, or ultra-relativistic flows propelled from sites of magnetic reconnection.
WebJun 1, 2015 · The U.S. Department of Energy's Office of Scientific and Technical Information WebIf gamma ray bursts are highly collimated, radiating into only a small fraction of the sky, the energy requirements of each event may be reduced by several (up to 4–6) orders of magnitude, and the event rate increased correspondingly. The large Lorentz factors (Γ≳100) inferred from GRB spectra imply relativistic beaming of the gamma rays into an …
WebGamma-ray bursts (GRBs) are powered by ultrarelativistic jets. Usually a minimum value of the Lorentz factor of the relativistic bulk motion is obtained based on the argument that …
WebOct 21, 1999 · Value of the four relevant radii as a function of the bulk average Lorentz factor 〈Γ〉 in a burst with energy E =10 52 erg, which lasts 10 s and produces 100 (left panel) and 25 000 (right panel) shells, respectively. The ISM has been assumed uniform with density n =1 cm −3. corporations vs corporatesWebDec 10, 2014 · Gamma-ray bursts (GRBs) are powered by ultra-relativistic jets. Usually a minimum value of the Lorentz factor of the relativistic bulk motion is obtained based on the argument that the observed high energy photons ( ) can escape without suffering from absorption due to pair production. corporation tax 2015/16WebJan 25, 2024 · Considering all bursts with known redshift and with an early coverage of their emission, we find 67 GRBs (including one short event) with a peak in their optical or GeV light curves at a time tp. For another 106 GRBs we set an upper limit tpUL. The measure of tp provides the bulk Lorentz factor Γ0 of the fireball before deceleration. far cry 5 pistolen takedownWebAbstract. A recent progress in the study of γ 𝛾 \gamma italic_γ-ray jets is reviewed, with a focus on some theoretical interpretations of the VHE emission from M87, and possibly other misaligned blazars; the connection between the GeV breaks exhibited by bright LAT blazars and opacity sources in the broad line region; the consequences of the detection of GeV … corporation tax 2019 20WebINTRODUCTION Relativistic expansion is a key property of gamma-ray bursts (GRBs)andhasbeenconfirmedbymeasurementsofradioafter- glow sizes, such as the … corporation tax 2015WebJun 18, 2015 · Gamma-ray bursts (GRBs) are powered by ultrarelativistic jets. Usually a minimum value of the Lorentz factor of the relativistic bulk motion is obtained based on the argument that the observed high-energy photons can escape without suffering from absorption due to pair production.The exact value, rather than a lower limit, of the … far cry 5 photo modeWebBulk Lorentz factors of gamma-ray bursts 1. Introduction. The relativistic nature of gamma-ray bursts (GRBs) was originally posed on theoretical grounds (... 2. The … far cry 5 pics