Flares, broadening of the pulse-frequency peak and quasi-periodic oscillations in the transient X-ray pulsar 4U 1901+03
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چکیده
منابع مشابه
Quasi Periodic Oscillations during an outburst of the transient X - ray pulsar XTE J 1858
We have investigated the Quasi Periodic Oscillation (QPO) properties of the transient accreting X-ray pulsar XTE J1858+034 during the second outburst of this source in April-May 2004. We have used observations made with the Proportional Counter Array (PCA) of the Rossi X-ray Timing Explorer (RXTE) during May 14-18 2004, in the declining phase of the outburst. We detected the presence of low fre...
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With ASCA, we have detected three X-ray flares from the Class I protostar YLW15. The flares occurred every ∼20 hours and showed an exponential decay with time constant 30–60 ks. The X-ray spectra are explained by a thin thermal plasma emission. The plasma temperature shows a fast-rise and slow-decay for each flare with kTpeak ∼ 4–6 keV. The emission measure of the plasma shows this time profile...
متن کاملVariable Quasi Periodic Oscillations during an outburst of the transient X - ray pulsar XTE J 1858 + 034
We have investigated the Quasi Periodic Oscillation (QPO) properties of the transient accreting X-ray pulsar XTE J1858+034 during the second outburst of this source in April-May 2004. We have used observations made with the Proportional Counter Array (PCA) of the Rossi X-ray Timing Explorer (RXTE) during May 14-18 2004, in the declining phase of the outburst. We detected the presence of low fre...
متن کاملThe Amplitude of the Kilohertz Quasi-periodic Oscillations in 4u 1728–34, 4u 1608–52, and Aql X-1, as a Function of X-ray Intensity
We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728–34, 4U 1608–52, and Aql X-1. Each source traces out a set of nearly parallel tracks in a frequency vs. X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency, the 2 − 60 keV source count rate can differ by up to a factor of ∼ 4, whereas at the same time the...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2010
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2010.17543.x