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Gamma Ray - DOAJ

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Last Updated: 03 September 2022

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Search for Gamma-ray Emission from Accretion Flares of Tidal Disruption Events Possibly Associated with the IceCube Neutrinos

The collective gamma-ray emission of this class of sources was also not visible enough to be detected by the Fermi Large Area Telescope, according to We then did a stacking analysis for the sample sources, finding that the collective gamma-ray emission of this class of sources was also not strong enough to be detected by the Fermi Large Area Telescope. The nondetection of the high-energy gamma-ray emission from the sample TDEs could be due to the fact that the high-energy gamma rays are disabsorbed by soft photons in the source. For these TDEs, R 10 16 cm for standard TDE parameter values is determined using a model-based hypothesis.

Source link: https://doi.org/10.3390/universe8080433


Critical Tests of Leading Gamma Ray Burst Theories

It has been found that supernovae of Type Ic produce long-lived gamma-ray bursts and that neutron star mergers produce short hard GRBs. The SN-Less GRBs appear to have originated in a phase transition of a neutron star in a high mass X-ray binary. GRBs and their afterglows' fireball and cannonball models have been extensively confronted with the massive observation results, with their supporters claiming triumph.

Source link: https://doi.org/10.3390/universe8070350


Study of Gas Holdup Distribution in Cylindrical Split Airlift Reactor by Using Gamma-Ray Densitometry (GRD)

For the first time in this work for such a cylindrical split airlift column, the local gas holdup's specifics and behaviors in the cylindrical split airlift column were investigated by using unusual gamma-ray densitometry analysis in a noninvasive manner. In the entire split reactor column, both rising and descending directions, as well as their behavior in the split plate's upper and lower zones, were investigated.

Source link: https://doi.org/10.3390/pr10050910


Multi-Messenger Constraints on the Hubble Constant through Combination of Gravitational Waves, Gamma-Ray Bursts and Kilonovae from Neutron Star Mergers

Independent measurements of distance and redshift following the binary neutron star merger GW170817 lead to independent measurements of distance and redshift, giving a realistic estimate of the Hubble constant H 0 that does not depend on a cosmic distance ladder or a particular cosmological model. This strategy holds the ability to resolve the existing tension between the H 0 value inferred from the cosmic microwave background and those obtained from local measurements by using gravitational waves as u201cconvanced sirensu201d.

Source link: https://doi.org/10.3390/universe8050289


Statistical Properties of X-ray Flares in Gamma-ray Bursts

We divide the sample into four categories: early flares, late flares, long gamma-ray burst flares, and short gamma-ray burst flares, as well as analyzing the flare parameters' distributions and relationships. In addition, the SGRB flares' morphological parameters are similar to those of the LGRB flares. The early flares' durations and increasing times are also positively connected to the peak times, and peak times are also associated with the peak times, but late flares are more specific dependent relationships. L X, p u2212 1. 45 for the LGRB flares, and L X, p z u2212 1. 47 for the SGRB flares, respectively. All of the late flares fell into the 3 u03c3 confidence zone characterized by the early flares.

Source link: https://doi.org/10.3390/universe8070358


The Spatial Distribution of Gamma-Ray Bursts with Measured Redshifts from 24 Years of Observation

We investigated the possibility of a link between the GRB redshift and sky position, which could have been investigated. Both the sky and the radial component of the GRB distribution can be factored in, with one region named the Faraway GRB Patch showing deviation from the randomness with u22481% significance. Both the complete and the afterglow/host galaxy datasets are consistent with zero for the new Spatial Two-Point Correlation Function estimates.

Source link: https://doi.org/10.3390/universe8070342


The Hubble Diagram: Jump from Supernovae to Gamma-ray Bursts

The Hubble diagram shows a plot with a luminous distance modulus displayed with respect to the redshift. We use the SN Ia data from the Pantheon catalogue to calibrate the Swift long gamma-ray bursts as u201c standard candles, according to the Amati group in this study. Although the number of our LGRB samples is small and the mistakes are high, we find this strategy of expanding the cosmological distance scale promising for future cosmological measurements.

Source link: https://doi.org/10.3390/universe8070344


Effect of Fluid Composition on a Jet Breaking out of a Cocoon in Gamma-Ray Bursts: A Relativistic de Laval Nozzle Treatment

The jet's penetration through the cocoon resembles a de Laval nozzle, and the jet may experience recollimation shock transitions. The likelihood of shock transition and shock properties are related to the matter composition and the cocoon strength, according to our results.

Source link: https://doi.org/10.3390/universe8060294


Bayesian Methods for Inferring Missing Data in the BATSE Catalog of Short Gamma-Ray Bursts

To infer the missing information in the catalogs, we'll discuss how the proposed probabilistic modeling method can be used to newer catalogs of SGRBs and other astronomical studies.

Source link: https://doi.org/10.3390/universe8050267


Development of a Small-Sized, Flexible, and Insertable Fiber-Optic Radiation Sensor for Gamma-Ray Spectroscopy

A cerium-doped lutetium orthosilicate crystal was used in an inorganic spectroscopy experiment, and two solid-disc type radioactive isotopes with the same dimensions, cesium-137 and cobalt-60, were used as gamma-ray emitters. Using the FORS, we first established the length of the LYSO:Ce crystal considering the absorption of charged particle energy and determined the gamma-ray energy spectra. And when gamma-ray emitters are mixed, the experimental findings showed that the latest FORS can be used to distinguish species of radioactive isotopes by analyzing their inherent energy spectra. The relationship between the measured photon counts of the FORS and Cs-137's radioactivity was subsequently established. The number of scintillating light generated by the FORS has increased as a result of increased radioactivity of Cs-137. Lastly, the finished FORS' results were also investigated, according to the length and diameter of the POF.

Source link: https://doi.org/10.3390/s150921265

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions