We study the rapid X-ray time variability in all public data available from the \textit{Rossi X-ray Timing Explorer's} Proportional Counter Array on the atoll source 4U 1820--30 in the low-luminosity island state. A total of $\sim46$ ks of data wer...
Long duration gamma-ray bursts (GRBs), the brightest events since the Big Bang itself, are believed to originate in an ultra-relativistic jet breaking out from a massive stellar envelope. Despite decades of study, there is still no consensus on their...
We report X-ray observations of the radio galaxies B2 1615+35 (NGC 6109) and B2 1621+38 (NGC 6137), which belong to poor groups of galaxies and are characterized by a "head-tail" structure. We also analyze the X-ray behaviour of the radio galaxy NG...
IGR J18179-1621 is an obscured accreting X-ray pulsar discovered by INTEGRAL on 2012 February 29. We report on our 20 ksec Chandra-High Energy Transmission Gratings Spectrometer observation of the source performed on 2012 March 17, on two short conte...
We report on all the INTEGRAL and Swift data collected during the first outburst observed from IGRJ18179-1621. The broad-band spectral analysis showed that the X-ray emission from the source is heavily absorbed (N_H~10^23 cm^-2), and well described b...
レイトレ合宿3!!!で公開したレンダラ (⭐ 7)
We observed NGC 1624-2, the O-type star with the largest known magnetic field Bp~20 kG), in X-rays with the ACIS-S camera onboard the Chandra X-ray Observatory. Our two observations were obtained at the minimum and maximum of the periodic Halpha emis...
We present X-ray dust scattering halo results based on our 76 ks {\it Chandra} ACIS-S/HETGS observation of the LMXB dipping source 4U 1624-490. Through analysis of the halo light curves with 2-6 keV spectra over the persistent and dipping periods,...
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In this paper I will discuss future synergies between the Japanese MAXI X-ray all-sky monitor, to be placed on the International Space Station in 2009, and the next-generation radio astronomy array LOFAR, currently under construction in The Netherl...
Seven years of successful observations of the sky have been completed within the INTEGRAL mission, in the transition regime between X-rays and gamma-rays from ~10-8000 keV. Initially-agreed mission goals have been pursued, and both high-resolution im...
We report on interferometric observations with the CHARA Array of two classical Wolf-Rayet stars in suspected binary systems, namely WR 137 and WR 138. In both cases, we resolve the component stars to be separated by a few milliarcseconds. The data w...
We analyze the high-resolution X-ray spectrum of the supergiant O-star delta Orionis (O9.5II) with line ratios of He-like ions and a thermal plasma model, and we examine its variability. The O-supergiant delta Ori was observed in the wavelength range...
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Shop Best Buy for the Meta Ray-Ban Display glasses and Meta Neural Band. Enjoy the use of Meta AI, discreet messaging, real-time captions, a hands-free camera and more.
Shop Meta Ray Ban Display & Neural Band | AI glasses with in lens display Shiny frame, standard band size 1 Black products at Best Buy. Find low everyday prices and buy online for delivery or in-store …
Shop Best Buy for the Meta Ray-Ban Display glasses and Meta Neural Band. Enjoy the use of Meta AI, discreet messaging, real-time captions, a hands-free camera and more.
We present ROSAT PSPC observations of the nova-like, or intermediate polar, TT Ari and the eclipsing polar DP Leo. Observations of TT Ari were performed as part of a simultaneous multiwavelength campaign. The X-ray spectrum of TT Ari from ROSAT was...