Results 31 to 40 of about 7,111 (156)

Catalog of 3 < z < 5.5 Quasar Candidates Selected among XMM-Newton Sources and Its Spectroscopic Verification

Frontiers in Astronomy and Space Sciences, 2017
We have compiled a catalog of 903 quasar candidates (including known quasars) at 3 < z < 5.5 selected among X-ray sources from the XMM-Newton serendipitous survey (3XMM-DR4 catalog).
Georgii Khorunzhev, Sergey Sazonov, Rodion Burenin, Maxim Eselevich   +3 more
doaj   +1 more source

High Energy Astrophysics

, 1991
The development of the atmospheric Cherenkov imaging technique has led to significant advances in gamma-ray detection sensitivity in the energy range from 200 GeV to 50 TeV. The Whipple Observatory 10m reflector has detected the first galactic and extragalactic sources in the Northern Hemisphere; the Crab Nebula has been established as the standard ...
  +5 more sources

Chaos in charged AdS black hole extended phase space

Physics Letters B, 2018
We present an analytical study of chaos in a charged black hole in the extended phase space in the context of the Poincare–Melnikov theory. Along with some background on dynamical systems, we compute the relevant Melnikov function and find its zeros ...
M. Chabab, H. El Moumni, S. Iraoui, K. Masmar, S. Zhizeh   +4 more
doaj   +1 more source

Mechanical Structure Design and Experimental Study of Gamma-ray Monitor for Small Satellite Payload

Applied Sciences, 2022
In this paper, a novel mechanical structure for a gamma-ray monitor (GRM) is designed for a small satellite payload. Its structural stiffness, strength and dynamic response are directly related to the performance of the novel GRM, which must meet the ...
Pengfei Guo, Hongbing Xin, Sheng Yang, Shaolin Xiong, Xinqiao Li, Zhenghua An, Dali Zhang   +6 more
doaj   +1 more source

Filter transmittance calibration of the follow-up x-ray telescope on board the EP satellite

AIP Advances
The Einstein Probe satellite is equipped with two payloads, one of which is the Follow-up X-ray Telescope (FXT). The FXT comprises two completely independent optical and detector systems: FXT-A and FXT-B.
Jingjing Xu, Juan Zhang, Tianxiang Chen, Na Gao, Xiaofan Zhao, Zijian Zhao, Weiwei Cui, Juan Wang, Yusa Wang, Yuxuan Zhu, Yanji Yang, Laidan Luo, Dawei Han, Jia Ma, Hao Wang, Xiongtao Yang, Jia Huo, Wei Li, Ziliang Zhang, Haoyang Geng, Yong Chen   +20 more
doaj   +1 more source

The X-ray properties and structure of A3571 up to R500

Astronomy & Astrophysics
Abell 3571 is a nearby, X-ray-bright galaxy cluster located in the Shapley Supercluster. Although it appears morphologically relaxed in X-ray images, multiwavelength observations reveal subtle indications of residual dynamical activity likely associated ...
Zheng X., Yu H., Jia S., Li C., Hou X., Liu A., Chen Y., Feng H., Song L., Liu C., Lu F., Zhang S., Yuan W., Sanders J., Wang J., Nandra K., Cui W., Guan J., Han D., Jin C., Liu Y., Xu J., Zhang J., Zhao H., Zhao X.   +24 more
doaj   +1 more source

Information theoretic measures for Lifshitz system

Journal of High Energy Physics
In this work, we have studied various mixed state information theoretic quantities for an excited state of Lifshitz spacetime in 3 + 1-dimensions. This geometry is the gravity dual to a class of 2 + 1-dimensional quantum field theories having Lifshitz ...
Souvik Paul, Anirban Roy Chowdhury, Ashis Saha, Sunandan Gangopadhyay   +3 more
doaj   +1 more source

High-Energy and Ultra-High-Energy Neutrino Astrophysics

Universe
The origin of high-energy cosmic rays, and their behavior in astrophysical sources, remains an open question. Recently, new ways to address this question have been made possible by the observation of a new astrophysical messenger, namely neutrinos.
Damiano F. G. Fiorillo
doaj   +1 more source

Minimal length scale correction in the noise of gravitons

European Physical Journal C: Particles and Fields, 2023
In this paper we have considered a quantized and linearly polarized gravitational wave interacting with a gravitational wave detector (interferometer detector) in the generalized uncertainty principle (GUP) framework. Following the analysis in Phys. Rev.
Soham Sen, Sunandan Gangopadhyay
doaj   +1 more source

Delensing for precision cosmology: optimizing future CMB B-mode surveys to constrain r

European Physical Journal C: Particles and Fields
The detection of primordial B-modes, a key probe of cosmic inflation, is increasingly challenged by contamination from weak gravitational lensing B-modes induced by large-scale structure (LSS).
Wen-Zheng Chen, Yang Liu, Yi-Ming Wang, Hong Li   +3 more
doaj   +1 more source