Results 61 to 70 of about 7,225,990 (222)

Enhanced colour encoding of materials discrimination information for multiple view dual-energy x-ray imaging [PDF]

, 2009
This thesis reports an investigation into dual-energy X-ray discrimination techniques. These techniques are designed to provide colour-coded materials discrimination information in a sequence of perspective images exhibiting sequential parallax.
Wang, X
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Connecting the X-Ray/UV Variability of Fairall 9 with NICER: A Possible Warm Corona

The Astrophysical Journal
The Seyfert 1 active galactic nucleus Fairall 9 was targeted by NICER, Swift, and ground-based observatories for a ∼1000 day long reverberation mapping campaign.
Ethan R. Partington, Edward M. Cackett, Rick Edelson, Keith Horne, Jonathan Gelbord, Erin Kara, Christian Malacaria, Jake A. Miller, James F. Steiner, Andrea Sanna   +9 more
doaj   +1 more source

AGILE observations of the ultra-luminous GRB 221009A [PDF]

EPJ Web of Conferences
The ultra-luminous, long-duration transient event GRB 221009A was detected by several observatories - as the most luminous gamma-ray burst ever observed - from radio to VHE gamma rays, up to tens of TeV.
Piano Giovanni, Foffano Luca, Tavani Marco   +2 more
doaj   +1 more source

X-Ray Spectral Variability as a Probe of Multimessenger Emission in Blazar 5BZB J0630−2406

The Astrophysical Journal
X-ray observations are essential for understanding the multimessenger emission mechanisms of active galactic nuclei (AGN). Blazars, a subset of AGN whose X-ray emission predominantly originates from relativistic jets, have been proposed as promising high-
Jose Maria Sanchez Zaballa, Sara Buson, Stefano Marchesi, Francesco Tombesi, Thomas Dauser, Joern Wilms, Alessandra Azzollini   +6 more
doaj   +1 more source

AXAF: The Advanced X-ray Astrophysics Facility [PDF]

, 1988
The Advanced X-ray Astrophysics Facility (AXAF) will be the X-ray astronomy component of U.S. space exploration via Great Observatories (mostly orbital) for the remainder of the century.

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The high energy X-ray probe (HEX-P): Resolving the nature of Sgr A* flares, compact object binaries and diffuse X-ray emission in the Galactic center and beyond

Frontiers in Astronomy and Space Sciences
HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging (<10″ FWHM) and broad spectral coverage (0.2–80 keV) with an effective area far superior to current facilities’ (including XMM-Newton and NuSTAR).
Kaya Mori, Gabriele Ponti, Gabriele Ponti, Matteo Bachetti, Arash Bodaghee, Jonathan Grindlay, Jaesub Hong, Roman Krivonos, Ekaterina Kuznetsova, Shifra Mandel, Antonio Rodriguez, Giovanni Stel, Shuo Zhang, Tong Bao, Franz Bauer, Maïca Clavel, Benjamin Coughenour, Javier A. García, Julian Gerber, Brian Grefenstette, Amruta Jaodand, Bret Lehmer, Kristin Madsen, Melania Nynka, Peter Predehl, Ciro Salcedo, Daniel Stern, John Tomsick   +27 more
doaj   +1 more source

The Cosmic History of Black Hole Growth from Deep Multiwavelength Surveys

Advances in Astronomy, 2012
Significant progress has been made in the last few years on understanding how supermassive black holes form and grow. In this paper, we begin by reviewing the spectral signatures of active galactic nuclei (AGN) ranging from radio to hard X-ray ...
Ezequiel Treister, C. Megan Urry
doaj   +1 more source

Advanced X-ray Astrophysics Facility (AXAF): An overview [PDF]

, 1995
The Advanced X-ray Astrophysics Facility (AXAF) is the x-ray component of NASA's Great Observatories. To be launched in late 1998, AXAF will provide unprecedented capabilities for high-resolution imaging, spectrometric imaging, and high-resolution ...
Elsner, R. F., VanSpeybroeck, L. P., Weisskopf, M. C., ODell, S. L.   +3 more
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Thermonuclear Superburst of MAXI J1752−457 Observed with NinjaSat and MAXI

The Astrophysical Journal Letters
An uncatalogued bright X-ray transient was detected with MAXI on 2024 November 9, named MAXI J1752−457. The NinjaSat X-ray observatory promptly observed the source from November 10 to 18, while the small angular separation from the Sun hampered follow-up
Amira Aoyama, Teruaki Enoto, Takuya Takahashi, Sota Watanabe, Tomoshi Takeda, Wataru Iwakiri, Kaede Yamasaki, Satoko Iwata, Naoyuki Ota, Arata Jujo, Toru Tamagawa, Tatehiro Mihara, Chin-Ping Hu, Akira Dohi, Nobuya Nishimura, Motoko Serino, Motoki Nakajima, Takao Kitaguchi, Yo Kato, Nobuyuki Kawai, (NinjaSat collaboration)   +20 more
doaj   +1 more source

PHOTOMETRIC STUDY OF A NEW X-RAY SOURCE -THE ECLIPSING POLAR RXJ 2107.9-0518

Odessa Astronomical Publications, 2017
The object RXJ 2107.9-0518 was discovered as a soft X-ray source at the space observatory ROSAT in 1990. Its X-ray spectrum is characteristic to the systems of the AM Her type thus the object was suspected to be a polar.
E. P. Pavlenko
doaj   +1 more source