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Gamma Ray - Astrophysics Data System

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Last Updated: 03 September 2022

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Diffuse X-Ray and Gamma-Ray Limits on Boson Stars that Interact with Nuclei

Light bosonic dark matter can help establish gravitationally bound states identified as boson stars. We show how tiny effective couplings between the bosonic black matter and the nucleon lead to a possibility that accelerates ISM baryons as they pass the boson star, sending the ISM within to radiate at a high rate and vigour. Unlike terrestrial searches, where it has been found that back-action can screen light bosonic fields, this novel approach places limitations on boson star dark matter while avoiding back-action from ambient baryons on the boson star design.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220900017A/abstract


Multi-View Reconstruction using Signed Ray Distance Functions (SRDF)

In this paper, we discuss the issue of multi-view 3D shape reconstruction. Although new alternate rendering software solutions related to implicit shape representations have resulted in breakthrough results, computationally costly, and estimations often lack certainty on the estimated geometries. To solve these limitations, we investigated a new computational approach that builds on a novel shape representation that is volumetric, as in recent differentiable rendering schemes, but parameterized with depth maps to help visualize the shape surface. This representation uses 3D geometry with color photographs and does not need appearance confirmation, but volumetric integration can still be benefited when optimized. In practice, we suggest the SRDF, an implicit shape representation based on signed distances that we define by depth along camera rays. This at 3D locations within the volumetric representation, the associated shape energy considers the relationship between depth prediction consistency and photometric consistency.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220900082Z/abstract


The Athena X-ray Integral Field Unit: a consolidated design for the system requirement review of the preliminary definition phase

The Athena X-ray Integral Unit, the high resolution X-ray spectrometer, has been studying in the mid-30s on the Athena space X-ray Observatory, a versatile observatory built to reflect the Hot and Energetic Universe science theme, which was selected by the Survey Science Committee in November 2013. The X-IFU completed its System Requirement Report in June 2022, about the same time when ESA recommended for an overall X-IFU revision due to Athena's unanticipated cost overrun. Because of the original X-IFU's scientific goals of the Athena mission, the X-IFU is expected that due to the research conducted so far on X-IFU, as well as the design-to-cost exercise requested by ESA, the X-IFU's design-to-cost exercise will continue.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220814562B/abstract


Fan beamed X-ray emission from 1 keV to above 130 keV from the ultraluminous X-ray pulsar RX J0209.6-7427 in the Small Magellanic Cloud

During the 2019 giant outburst, the transient X-ray pulsar RX J0209. 6 - 7427 in the Small Magellanic Cloud provided extensive timing and spectral data. From 1 keV up to the 130 MATH-EQ 180 keV band, the highest energy emission detected from any PULXs outside of the Milky Way was found in extitInsight-HXMT's broad energy band. Accordingly, the composition of the neutron star and its ULX emission can be understood within the new theoretical frame of accreting neutron stars.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220814785H/abstract


Radio monitoring of transient Be/X-ray binaries and the inflow-outflow coupling of strongly-magnetized accreting neutron stars

Since classical jet-launching models predict that such NSs are unlikely to launch jets due to their ability to launch jets by objects with a solid surface, modern findings and models support this. Our findings are discussed in the broader context of X-ray binary radio research studies, concluding that our findings reveal how supergiant X-ray binaries may host a new unidentified additional radio emission mechanism.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220814903V/abstract


The ALPACA experiment: The project of the first sub-PeV gamma-ray observation in the southern sky

For the first time in the southern hemisphere, the ALPACA experiment is a program that aims to detect sub-Pev gamma rays. By observing sub-Pev pion-decay gamma rays produced in PeV cosmic ray interactions with the outer atmosphere, the main aim of ALPACA is to determine PeVatrons, the accelerators of Galactic PeV cosmic rays. In the middle of Mt. , this new air shower experiment is located at a height of 4,740 meters above sea level. In 2022, ALPAQUITA will begin recording in 2022 and extend to ALPACA in 2024.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220814659K/abstract


Impact of Neutrino Cooling on Type-I X-ray Bursts and X-ray Superbursts

We are looking into the effects of the neutrino cooling mechanism within the neutron star core's light curves of type-I X-ray bursts and X-ray superbursts. The effects of NS cooling on the X-ray bursts were investigated using a general-relativistic stellar-evolution code in the present study, which is focused on the DU process and nucleon superfluidity. We also used our burst models to simulate the comparison with GS 1826 - 24, as well as the recurrence time of superburst triggered by carbon ignition.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220814622D/abstract


First Results on the Revealing of Cognate Ancestors among the Particles of the Primary Cosmic Rays That Gave Rise to Extensive Air Showers Observed by the GELATICA Network

For the first time we've used the technique we've developed earlier for identifying two closely separated large air showers, the ancestor particles of which appeared in a single process, which was likely to be present in a single process.

Source link: https://ui.adsabs.harvard.edu/abs/2022Symm...14.1749V/abstract


Highly luminescent zero-dimensional lead-free manganese halides for β-ray scintillation

b03b2-rays are a useful tool for measuring nuclear radiation contamination on the surface because of their modest penetration rate. As scintillators exhibit effective u03b2-ray scintillation, two highly luminescent zero-dimensional organic-free metal halide hybrids, 2 MnBr 4 and 2 MnBr 4, and 2 MnBr 4. Both hybrids feature a narrow-band green emission peak of 518 nm with photoluminescence quantum efficiencies of 81. 3% for 2 MnBr 4 and 86. 4% for 2 MnBr 4 and 86. 4% respectively, according to respectively. For the first time, we successfully synthesized 2 MnBr 4 colloidal nanocrystals to enable the solution processing of this promising metal halide hybrid. The first RL intensity can be maintained after an extremely high cumulative radiation dose of 240 kGy. 2 MnBr4 scintillators are exhibiting a linear reaction to u03b2-ray dose rates from 400 to 2,800 Gy. s u22121, as well as robust radiation resistance that 80% of the initial RL intensity can be maintained after an elevated accumulated radiation dose of 240 kGy.

Source link: https://ui.adsabs.harvard.edu/abs/2022NaRes..15.8486L/abstract


X-ray phase contrast imaging: From synchrotrons to conventional sources

Poor image quality resulting from poor attenuation differences can be revolutionize X-ray imaging and remove its key limitation: poor image quality due to poor image contrast due to poor image quality due to low attenuation differences. Following pioneering experiments dating back to the mid-nineties, X-ray phase contrast imaging exploded" in the mid-nineties, when third-generation synchrotron sources became more widely available. This pioneering period led to the first clinical application of phase contrast mammography on human patients, as well as a slew of other topics.

Source link: https://ui.adsabs.harvard.edu/abs/2014NCimR..37..467O/abstract

* 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