Return of 4U 1730–22 after 49 yr Silence: The Outburst Properties Observed by NICER and Insight-HXMT
The Astrophysical Journal Letters, 2022 After 49 yr of quiescence, 4U 1730–22 became active and had two outbursts in 2021 and 2022; the onset and tail of the outbursts were observed by NICER, which give us a peerless opportunity to study the state transition and its underlying mechanism.
Yu-Peng Chen +12 more
doaj +1 more source
LINKING BURST-ONLY X-RAY BINARY SOURCES TO FAINT X-RAY TRANSIENTS [PDF]
The Astrophysical Journal, 2009 Burst-only sources are X-ray sources showing up only during short bursts but with no persistent emission (at least with the monitoring instrument which led to their discovery). These bursts have spectral characteristics consistent with thermonuclear (type I) burst from the neutron star surface, linking burst-only sources to neutron star X-ray binary ...
openaire +2 more sources
Power-Colours: Simple X-ray Binary Variability Comparison [PDF]
, 2015 We demonstrate a new method of variability classification using observations of black hole X-ray binaries. Using `power colours' -- ratios of integrated power in different Fourier frequency bands -- we can clearly differentiate different canonical black ...
Heil, L. M., Klein-Wolt, M., Uttley, P.
core +5 more sources
A Search for Hard X-Ray Emission from Globular Clusters - Constraints from BATSE [PDF]
, 1996 We have monitored a sample of 27 nearby globular clusters in the hard X-ray band (20-120 keV) for approximately 1400 days using the BATSE instrument on board the Compton Gamma-Ray Observatory.
Ford, E. +4 more
core +2 more sources
Fermi-LAT results on Galactic Plane gamma-ray Transient Sources [PDF]
, 2009 The Large Area Telescope on the Fermi gamma-ray Space Telescope provides unprecedented sensitivity for all-sky monitoring of gamma-ray activity. It has detected a few Galactic sources, including 2 gamma-ray binaries and a microquasar.
Chaty, Sylvain
core +3 more sources
Suzaku Observations of Four Heavily Absorbed HMXBs
, 2008 We report on Suzaku observations of four unidentified sources from the INTEGRAL and Swift BAT Galactic plane surveys. All the sources have a large neutral hydrogen column density and are likely members of an emerging class of heavily absorbed high mass X-
Abt +30 more
core +1 more source
IGR J17544-2619: A new supergiant fast X-ray transient revealed by optical/infrared observations [PDF]
, 2006 One of the most recent discoveries of the INTEGRAL observatory is the existence of a previously unknown population of X-ray sources in the inner arms of the Galaxy. IGR J17544-2619, IGR J16465-4507 and XTE J1739-302 are among these sources.
Balona +22 more
core +2 more sources
Transient X-ray Sources in the Magellanic-type Galaxy NGC 4449
, 2016 We report the identification of seven transient X-ray sources in the nearby Magellanic-type galaxy NGC 4449 using the archival multi-epoch X-ray observations conducted with {\it Chandra}, {\it XMM-Newton} and {\it Swift} telescopes over year 2001--2013 ...
Jithesh, V., Wang, Zhongxiang
core +1 more source
A transient ultraluminous X-ray source in NGC 55
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Ultraluminous X-ray sources (ULXs) are a class of accreting compact objects with X-ray luminosities above 1039 erg s−1 . The average number of ULXs per galaxy is still not well-constrained, especially given the uncertainty on the fraction of ULX transients.
Robba, A, Barra, F
openaire +7 more sources
First Results from Fermi GBM Earth Occultation Monitoring: Observations of Soft Gamma-Ray Sources Above 100 keV [PDF]
, 2010 The NaI and BGO detectors on the Gamma-ray Burst Monitor (GBM) on Fermi are now being used for long-term monitoring of the hard X-ray/low energy gamma-ray sky.
A. Camero-Arranz +64 more
core +3 more sources