Αποτελέσματα Αναζήτησης
8 Ιουν 2022 · X-ray observations of the unexpectedly complex structure in the hot gas in galaxy clusters, the Universe’s largest gravitationally bound structures, have revealed fundamental relationships with...
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17 Φεβ 2019 · We present the long term, frequency-dependent, X-ray time lags of the Seyfert galaxy NGC 4051. We used Rossi X-ray Timing Explorer ( RXTE ) light curves in the 2–4, 4–7, and 7–10 keV bands and we measured the time lags at 10 −7 –10 −6 Hz.
18 Φεβ 2021 · This event demonstrates that a magnetar can produce X-ray bursts in coincidence with FRB-like radio bursts. It also suggests that FRBs associated with magnetars can emit X-ray bursts.
Variability pervades the cosmos. Almost all astrophysical objects, from stars in the surroundings of the solar system to supermassive black holes in the nuclei of very distant galaxies, display a distinctive variability. Their flux and spectral shape change within a range of timescales.
We have examined the light curves of several X-ray binaries that show long-term variability, using data from the all-sky mon-itor (ASM) aboard the Rossi X-Ray Timing Explorer (RXTE). Here we concentrate on three systems with very different basic properties—the black hole candidate LMC X-3, the low-mass
3 Νοε 2016 · In this paper, we have performed long-term (up to ≈15 years, observed-frame) X-ray variability analyses for the 68 X-ray brightest radio-quiet AGNs in the uniquely deep CDF-S; most of these objects are at redshifts of 0.6–3.1, providing access to penetrating rest-frame X-rays up to ≈10–30 keV.
A variety of statistical methods for understanding variability in the time domain for low count rate X-ray and gamma-ray sources are explored. Variability can be detected using nonparametric (Anderson-Darling and overdispersion tests) and parametric (sequential likelihood-based tests) tools.
