Results 1 to 10 of about 403,855 (253)
GRB060602B = Swift J1749.4-2807: an unusual transiently accreting neutron-star X-ray binary [PDF]
, 2008 We present an analysis of the Swift BAT and XRT data of GRB060602B, which is most likely an accreting neutron star in a binary system and not a gamma-ray burst. Our analysis shows that the BAT burst spectrum is consistent with a thermonuclear flash (type-
Angelini +37 more
core +15 more sources
The Astrophysical Journal, 2023 The launch of the Imaging X-ray Polarimetry Explorer (IXPE) on 2021 December 9 has opened a new window in X-ray astronomy. We report here the results of the first IXPE observation of a weakly magnetized neutron star, GS 1826−238, performed on 2022 March ...
Fiamma Capitanio +96 more
doaj +1 more source
Spectral Energy Distributions of Southern Binary X-Ray Sources
The Astrophysical Journal Supplement Series, 2023 The rapid variability of X-ray binaries (XRBs) produces a wide range of X-ray states that are linked to activity across the electromagnetic spectrum. It is particularly challenging to study a sample of sources large enough to include all types in their ...
John M. Dickey +7 more
doaj +1 more source
An Optically Discovered Outburst from XTE J1859+226
The Astrophysical Journal, 2023 Using the Zwicky Transient Facility, in 2021 February we identified the first known outburst of the black hole X-ray transient XTE J1859+226 since its discovery in 1999. The outburst was visible at X-ray, UV, and optical wavelengths for less than 20 days,
Eric C. Bellm +15 more
doaj +1 more source
Clumpy Wind Studies and the Nondetection of a Cyclotron Line in OAO 1657–415
The Astrophysical Journal, 2023 Winds of massive stars are suspected to be inhomogeneous (or clumpy), which biases the measures of their mass-loss rates. In high-mass X-ray binaries (HMXBs), the compact object can be used as an orbiting X-ray point source to probe the wind and ...
Pragati Pradhan +13 more
doaj +1 more source
The Astrophysical Journal, 2023 Gamma-ray binary systems, a subclass of high-mass X-ray binaries, show nonthermal emissions from radio to TeV. While efficient electron acceleration is considered to take place in them, the nature of the acceleration mechanism and the physical ...
Hiroki Yoneda +7 more
doaj +1 more source
A Comparison of Millisecond Pulsar Populations between Globular Clusters and the Galactic Field
The Astrophysical Journal, 2023 We have performed a systematic study of the rotational, orbital, and X-ray properties of millisecond pulsars (MSPs) in globular clusters (GCs) and compared their nature with those of the MSPs in the Galactic field (GF).
Jongsu Lee +6 more
doaj +1 more source
PSR J1953+1844 Probably Being the Descendant of an Ultracompact X-Ray Binary
The Astrophysical Journal Letters, 2023 PSR J1953+1844 (i.e., M71E) is a millisecond pulsar in a 53 minute binary orbit discovered by the Five-hundred-meter Aperture Spherical radio Telescope. The mass function from pulsar timing is 2.3 × 10 ^−7 M _⊙ .
Z. L. Yang +3 more
doaj +1 more source
Why Do Black--Hole X-ray Binaries Tend to Be Transient? [PDF]
, 1999 Black hole X-ray binaries are transient probably because their discs are subject to the same thermal-viscous instability which is present in dwarf nova binary systems.
Lasota, Jean-Pierre
core +3 more sources
Beam Pattern Evolution of Accreting X-Ray Pulsar 1A 0535+262 during Its 2020 Giant Outburst
The Astrophysical Journal, 2023 We report on pulse profile decomposition analysis of bright transient X-ray pulsar 1A 0535+262 using broadband Insight-HXMT observations during a giant outburst of the source in 2020.
Y. F. Hu +9 more
doaj +1 more source