Results 111 to 120 of about 7,225,990 (222)

Colliding-wind binaries as non-thermal X-ray emitters: an observational investigation from XMM-Newton to next generation X-ray observatories [PDF]

, 2007
The investigation of massive stars in the radio domain revealed about 25 years ago that some of them are synchrotron emitters, showing that these objects are able to accelerate particles up to relativistic velocities.
De Becker, Michaël
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Detection and Analysis of an Upward Jet‐Like Electrical Discharge Intercepting a High‐Altitude Research Aircraft

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract During a 2023 field campaign, a NASA ER‐2 research aircraft intercepted an upward jet‐like electrical discharge at 20 km altitude over an intense tropical thunderstorm. This event was analyzed using airborne multispectral optical sensors, electric field mills, X‐band radar, passive microwave, and ground‐based radio networks.
T. J. Lang, A. Mezentsev, M. G. Quick, C. G. Amiot, M. Bateman, R. Blakeslee, S. Cummer, G. M. Heymsfield, R. A. Kroodsma, N. G. Lehtinen, D. Mach, M. Marisaldi, M. Walker McLinden, N. Østgaard, M. Pazos, D. A. S. Sarria, C. J. Schultz, T. D. Walker, O. van der Velde, K. Virts   +19 more
wiley   +1 more source

Probing Axion–Photon Mixing with High-resolution X-Ray Spectroscopy

The Astrophysical Journal
Axion-like particles (ALPs) provide a compelling avenue for exploring physics beyond the Standard Model. In astrophysical magnetized plasmas, an ALP–photon coupling g _aγ induces energy-dependent oscillations in the photon survival probability that ...
Yu Zhou, Jiejia Liu, Volodymyr Takhistov, Kazuhisa Mitsuda   +3 more
doaj   +1 more source

X-Ray Optics: Past, Present, and Future

, 2010
X-ray astronomy started with a small collimated proportional counter atop a rocket in the early 1960s. It was immediately recognized that focusing X-ray optics would drastically improve both source location accuracy and source detection sensitivity.
Zhang, William W.
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Constraints on Diffuse X-Ray Emission from the TeV Halo Candidate HESS J1813-126

The Astrophysical Journal
Extended regions of very high-energy γ -ray emission associated with middle-aged pulsars have been found by γ -ray observatories. These regions, called TeV halos or pulsar halos, are thought to be created when energetic electrons from a pulsar or pulsar ...
David Guevel, Kim L. Page, Kaya Mori, Amy Lien, Ke Fang   +4 more
doaj   +1 more source

Searching for Compact Obscured Nuclei in Compton-thick Active Galactic Nuclei

The Astrophysical Journal
Compact obscured nuclei (CONs) are heavily obscured infrared cores that have been found in local (ultra-)luminous infrared galaxies. They show bright emission from vibrationally excited rotational transitions of HCN, known as HCN-vib, and are thought to ...
Makoto A. Johnstone, George C. Privon, Loreto Barcos-Muñoz, A.S. Evans, S. Aalto, Lee Armus, Franz E. Bauer, L. Blecha, J. S. Gallagher, S. König, Claudio Ricci, Ezequiel Treister, Cosima Eibensteiner, Kimberly L. Emig, Kara N. Green, Devaky Kunneriath, Jaya Nagarajan-Swenson, Alejandro Saravia, Ilsang Yoon   +18 more
doaj   +1 more source

The high energy X-ray probe (HEX-P): constraining supermassive black hole growth with population spin measurements

Frontiers in Astronomy and Space Sciences
Constraining the primary growth channel of supermassive black holes (SMBHs) remains one the most actively debated questions in the context of cosmological structure formation. Owing to the expected connection between SMBH spin parameter evolution and the
J. M. Piotrowska, J. A. García, J. A. García, D. J. Walton, R. S. Beckmann, D. Stern, D. R. Ballantyne, D. R. Wilkins, S. Bianchi, P. G. Boorman, J. Buchner, C.-T. Chen, C.-T. Chen, P. Coppi, T. Dauser, A. C. Fabian, E. Kammoun, E. Kammoun, E. Kammoun, K. Madsen, L. Mallick, L. Mallick, L. Mallick, G. Matt, G. Matzeu, E. Nardini, A. Pizzetti, S. Puccetti, C. Ricci, C. Ricci, F. Tombesi, F. Tombesi, F. Tombesi, F. Tombesi, F. Tombesi, N. Torres-Albà, K.-W. Wong   +36 more
doaj   +1 more source

Novel spectral-timing methods for X-ray binary variability studies

, 2012
This work explores the connection between the spectral properties of the X-ray emission produced by black hole X-ray binaries (BHXRBs) and the variability properties of these sources that are embedded in light curves.
Cassatella, Pablo M.
core   +1 more source

A Plethora of X-ray Telescopes

This explanation describes the observatories we are currently using to study X-rays from space. Chandra, named for Nobel prize winner Subrahmanyan Chandrasekhar, was launched from the space shuttle in 1999. Current X-ray observatories include The Rossi X-

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Very high energy cosmic gamma rays from radio and x-ray pulsars [PDF]

, 1987
This thesis is concerned with the detection of very high energy cosmic gamma-rays from isolated pulsars and X-ray binary sources using the atmospheric Cerenkov technique. A general introduction to gamma ray detection techniques is followed by adscription
Chadwick, P.M, Chadwick, Mary Paula
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