Results 31 to 40 of about 77,058 (202)
On the possibility of sub-TeV Gamma-ray emission from Cyg X-3
, 2010 The compact X-ray binary system Cyg X-3 has been recently discovered as a source of GeV gamma-rays by the AGILE and the {\it Fermi} satellites. It shows emission features in the GeV gamma-rays similar to other gamma-ray binaries which were also observed ...
Abdo +36 more
core +1 more source
UniverseThe Lobster Eye Imager for Astronomy (LEIA) is the pathfinder of the wide-field X-ray telescope used in the Einstein Probe mission. In this study, we present an image of the Virgo Cluster taken by LEIA in the 0.5–4.5 keV band with an exposure time of ∼17.
Wen-Cheng Feng +11 more
doaj +1 more source
X-ray Data Analysis to Search for Magnetar Candidates in the Galactic Plane
Journal of Astronomy and Space Sciences, 2018 We report on our Galactic plane searches for magnetars in the archival Chandra X-ray Observatory (CXO) data. We summarize the properties of known magnetars and use them to establish a procedure for magnetar searches.
Woochan Park, Hongjun An
doaj +1 more source
A Comprehensive Comparison of Spin-up and Spin-down Episodes of 4U 1538-522 Observed with NuSTAR
The Astrophysical Journal4U 1538-522 is a persistent high-mass X-ray binary that exhibits secular spin evolution. In 2019, it underwent a torque reversal from spinning up to spinning down.
Yongfeng Hu, Long Ji, Cong Yu, Lili Yang
doaj +1 more source
A Transmissive X-ray Polarimeter Design For Hard X-ray Focusing Telescopes
, 2015 The X-ray Timing and Polarization (XTP) is a mission concept for a future space borne X-ray observatory and is currently selected for early phase study. We present a new design of X-ray polarimeter based on the time projection gas chamber.
Deng, Zhi +13 more
core +1 more source
High Energy Variability Of Synchrotron-Self Compton Emitting Sources: Why One Zone Models Do Not Work And How We Can Fix It [PDF]
, 2007 With the anticipated launch of GLAST, the existing X-ray telescopes, and the enhanced capabilities of the new generation of TeV telescopes, developing tools for modeling the variability of high energy sources such as blazars is becoming a high priority ...
Georganopoulos, Markos +3 more
core +2 more sources
Optimization of graded multilayer designs for astronomical x-ray telescopes [PDF]
, 1999 We developed a systematic method for optimizing the design of depth-graded multilayers for astronomical hard-x-ray and soft-γ-ray telescopes based on the instrument’s bandpass and the field of view.
Christensen, Finn E. +3 more
core +1 more source
Optical design of diffraction-limited x-ray telescopes [PDF]
Applied Optics, 2020 Astronomical imaging with micro-arcsecond (µas) angular resolution could enable breakthrough scientific discoveries. Previously proposed µas x-ray imager designs have been interferometers with limited effective collecting area. Here we describe x-ray telescopes achieving diffraction-limited performance over a wide energy band with large effective area,
Brandon D. Chalifoux +3 more
openaire +3 more sources
In-flight Performance of the IXPE Telescopes
The Astronomical JournalWe present a comprehensive characterization of the on-orbit imaging performance of the three telescopes on board the Imaging X-ray Polarimetry Explorer (IXPE).
Riccardo Ferrazzoli +17 more
doaj +1 more source
Science with the Constellation-X Observatory [PDF]
, 1999 The Constellation X-ray Mission is a high throughput X-ray facility emphasizing observations at high spectral resolution (E/\Delta E \sim 300-3000), and broad energy bandpass (0.25-40 keV).
Tananbaum, Harvey +3 more
core +3 more sources