Results 81 to 90 of about 762 (173)
X-ray polarimetry: historical remarks and other considerations [PDF]
, 2010 We briefly discuss the history of X-ray polarimetry for astronomical applications including a guide to the appropriate statistics. We also provide an introduction to some of the new techniques discussed in more detail elsewhere in these proceedings. We conclude our discussion with our concerns over adequate ground calibration, especially with respect ...
openaire +2 more sources
Modeling Fast X-Ray Variability around an Accreting Black Hole
The Astrophysical JournalX-ray interband time lags are observed during the outbursts of black hole X-ray binaries. Timing analysis of fast variability in low Fourier frequency bands shows that high-energy photons lag behind low-energy photons, a phenomenon referred to as hard ...
Yejing Zhan +4 more
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X-ray Polarization of Blazars and Radio Galaxies Measured by the Imaging X-ray Polarimetry Explorer
GalaxiesX-ray polarization, which now can be measured by the Imaging X-ray Polarimetry Explorer (IXPE), is a new probe of jets in the supermassive black hole systems of active galactic nuclei (AGNs).
Alan P. Marscher +6 more
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Proceedings of The Extreme and Variable High Energy Sky — PoS(Extremesky 2011), 2012 openaire +1 more source
X-Ray Polarimetric Observations of the Western Hotspot of Pictor A
The Astrophysical Journal LettersWe present the results of the analysis of a ∼2 Msec spectropolarimetric observation of the western hotspot (WHS) of the radio galaxy Pictor A. This is the brightest extragalactic radio source that allows us to carry out spatially resolved observations ...
Stefano Tugliani +12 more
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X-Ray Polarization Study of the Neutron Star Low-mass X-Ray Binary GX 349+2
The Astrophysical JournalWe report the first X-ray polarimetric results of the neutron star (NS) low-mass X-ray binary Z-source GX 349+2 using the Imaging X-ray Polarimetry Explorer (IXPE). We discovered that the X-ray source was polarized at a polarization degree of PD = 1.1% ±
Unnati Kashyap +5 more
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Magnetic Field Geometry of the Gamma-Ray Binary PSR B1259–63 Revealed via X-Ray Polarization
The Astrophysical Journal LettersSome X-ray binaries containing an energetic pulsar in orbit around a normal star accelerate particles to high energies in the shock cone formed where the pulsar and stellar winds collide.
Philip Kaaret +8 more
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IXPE Detection of Highly Polarized X-Rays from the Magnetar 1E 1841-045
The Astrophysical Journal LettersThe Imaging X-ray Polarimetry Explorer (IXPE) observed for the first time highly polarized X-ray emission from the magnetar 1E 1841−045, targeted after a burst-active phase in 2024 August.
Michela Rigoselli +14 more
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High Optical-to-X-Ray Polarization Ratio Reveals Compton Scattering in BL Lacertae’s Jet
The Astrophysical Journal LettersBlazars, supermassive black hole systems with highly relativistic jets aligned with the line of sight, are the most powerful long-lived emitters of electromagnetic emission in the Universe.
Iván Agudo +149 more
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Dramatic Drop in the X-Ray Polarization of Swift J1727.8–1613 in the Soft Spectral State
The Astrophysical Journal LettersBlack hole X-ray binaries exhibit different spectral and timing properties in different accretion states. The X-ray outburst of a recently discovered and extraordinarily bright source, Swift J1727.8–1613, has enabled the first investigation of how the X ...
Jiří Svoboda +36 more
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