Results 1 to 10 of about 695 (142)

Studies of dark energy with X-ray observatories. [PDF]

open access: yesProc Natl Acad Sci U S A, 2010
I review the contribution of Chandra X-ray Observatory to studies of dark energy. There are two broad classes of observable effects of dark energy: evolution of the expansion rate of the Universe, and slow down in the rate of growth of cosmic structures. Chandra has detected and measured both
Vikhlinin A.
europepmc   +4 more sources

Equalizing the Pixel Response of the Imaging Photoelectric Polarimeter Onboard the IXPE Mission

open access: yesThe Astronomical Journal, 2023
The Gas Pixel Detector is a gas detector, sensitive to the polarization of X-rays, currently flying onboard the Imaging X-ray Polarimetry Explorer (IXPE)—the first observatory dedicated to X-ray polarimetry.
John Rankin   +20 more
doaj   +1 more source

A Lack of 9 s Periodicity in the Follow-up NuSTAR Observation of LS 5039

open access: yesThe Astrophysical Journal, 2023
The Nuclear Spectroscopic Array (NuSTAR) observed the gamma-ray binary LS 5039 for a second time in order to check for the presence of a periodic signal candidate found in the data from the previous NuSTAR observation.
Oleg Kargaltsev   +3 more
doaj   +1 more source

The X-Ray Observatory Suzaku [PDF]

open access: yesPublications of the Astronomical Society of Japan, 2007
High-sensitivity wide-band X-ray spectroscopy is the key feature of the Suzaku X-ray observatory, launched on 2005 July 10. This paper summarizes the spacecraft, in-orbit performance, operations, and data processing that are related to observations. The scientific instruments, the high-throughput X-ray telescopes, X-ray CCD cameras, non-imaging hard X ...
Mitsuda, K.   +142 more
openaire   +3 more sources

The Large Observatory for x-ray timing [PDF]

open access: yesSPIE Proceedings, 2014
Proc.
Feroci, M.   +269 more
openaire   +19 more sources

The ASTRO-H X-ray Observatory [PDF]

open access: yesSPIE Proceedings, 2012
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by the Institute of Space and Astronautical Science (ISAS). ASTRO-H will investigate the physics of the high-energy universe via a suite of four instruments, covering a very wide energy range, from 0.3 keV to 600 keV.
Takahashi T.   +205 more
openaire   +4 more sources

First X-Ray Polarization Measurement Confirms the Low Black Hole Spin in LMC X-3

open access: yesThe Astrophysical Journal, 2023
X-ray polarization is a powerful tool to investigate the geometry of accreting material around black holes, allowing independent measurements of the black hole spin and orientation of the innermost parts of the accretion disk.
Jiří Svoboda   +111 more
doaj   +1 more source

LOFT — Large Observatory for X-ray Timing [PDF]

open access: yesJournal of Instrumentation, 2014
Accepted for publication on JINST (in press)
S. Zane   +30 more
openaire   +3 more sources

X-Ray Polarization of BL Lacertae in Outburst

open access: yesThe Astrophysical Journal Letters, 2023
We report the first >99% confidence detection of X-ray polarization in BL Lacertae. During a recent X-ray/ γ -ray outburst, a 287 ks observation (2022 November 27–30) was taken using the Imaging X-ray Polarimetry Explorer (IXPE), together with ...
Abel L. Peirson   +130 more
doaj   +1 more source

LOFT: the Large Observatory For X-ray Timing [PDF]

open access: yesSPIE Proceedings, 2012
Proceedings of SPIE, Vol. 8443, Paper No.
M. Feroci   +202 more
openaire   +15 more sources

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