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Wyświetlanie 1-10 z 122
Tytuł:
Protocols for x-ray transient grating pump/optical probe experiments at x-ray free electron lasers
Autorzy:
Lima, Frederico
Feurer, Thomas
Biednov, Mykola
Zalden, Peter
Serrat, Carles
Dhanalakshmi-Veeraraj, Mano R
Mincigrucci, Riccardo
Staub, Urs
Madsen, Anders
Vila-Comamala, Joan
Knoll, Martin
Bañares, Luis
Cucini, Riccardo
Chergui, Majed
Torre, Renato
Paltanin, Ettore
Ardana-Lamas, Fernando
Frankenberger, Paul
Heder, Siti
Khatu, Nupur N
Rossi, Giorgio
Masciovecchio, Claudio
Szlachetko, Jakub
Gessini, Alessandro
Ferrari, Eugenio
Maznev, Alexei A
Cannizzo, Andrea
Nelson, Keith A
Carrara, Pietro
Milne, Christopher
Berndt, Nadia
Bonetti, Stefano
Beye, Martin
Huang, Xinchao
Bencivenga, Filippo
Fainozzi, Danny
Brioschi, Marta
David, Christian
Mamyrbayev, Talgat
Scholz, Markus
Xu, Han
Gawelda, Wojciech M
Bargheer, Matias
Svetina, Cristian
Engel, Robin Y.
Opis:
Transient grating spectroscopy is a specialized application of the four-wave-mixing methodology and constitutes a versatile technique for investigating the dynamics of vibrational, magnetic and electronic degrees of freedom of matter in a background-free fashion. Recent developments in free-electron laser sources have enabled the extension of this technique into the extreme ultraviolet range. Ongoing efforts to expand transient grating spectroscopy into the x-ray regime promise numerous advantages: (1) substantial penetration depths that allow for probing bulk material properties, (2) element specificity via specific core-excited states, and (3) short wavelengths that allow for excitation gratings with higher momentum transfer and improved spatial resolution. In this study, we comprehensively outline the procedures for conducting x-ray transient grating pump/optical probe experiment. The process encompasses the design and alignment of the experimental setup, as well as the subsequent steps involved in data acquisition and analysis. This paper is intended as a comprehensive guide for researchers interested in implementing x-ray transient grating spectroscopy, providing valuable insights into the intricacies of the experimental workflow required for this novel technique. Furthermore, we discuss the potential for extending this methodology to an x-ray pump/x-ray probe scheme, envisioning a future direction that holds promise for enhancing the capabilities and scope of x-ray transient grating spectroscopy, opening new opportunities for studying ultrafast processes with unprecedented temporal and spatial resolutions.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Evidence of jet activity from the secondary black hole in the OJ 287 binary system
Autorzy:
Berdyugin, Andrei V.
Nilsson, Kari
Valtonen, Mauri J.
Jorstad, Svetlana G.
Jelínek, Martin
Matsumoto, Katsura
Mugrauer, Markus
Zhang, Zhongli
Marscher, Alan P.
Kishore, Shubham
Ogloza, Waldemar
Štrobl, Jan
Ciprini, Stefano
Drozdz, Marek
Zejmo, Michal
Uemura, M.
Reichart, Daniel E.
Kouprianov, Vladimir V.
Nakaoka, T.
Hudec, Rene
Lehto, Harry J.
Pursimo, Tapio
Sadun, Alberto
Minfeng, Gu
Weaver, Z. R.
Dey, Lankeswar
Gupta, Alok C.
Wiita, Paul J.
Davidson, James W.
Imazawa, Ryo
Gopakumar, Achamveedu
Zoła, Stanisław
Opis:
We report the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ 287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifrequency observing campaign was set up to search for such a signature of the impact based on a prediction made 8 yr earlier. The first I-band results of the flare have already been reported by Kishore et al. (2024). Here we combine these data with our monitoring in the R-band. There is a big change in the R–I spectral index by 1.0 ± 0.1 between the normal background and the flare, suggesting a new component of radiation. The polarization variation during the rise of the flare suggests the same. The limits on the source size place it most reasonably in the jet of the secondary BH. We then ask why we have not seen this phenomenon before. We show that OJ 287 was never before observed with sufficient sensitivity on the night when the flare should have happened according to the binary model. We also study the probability that this flare is just an oversized example of intraday variability using the Krakow data set of intense monitoring between 2015 and 2023. We find that the occurrence of a flare of this size and rapidity is unlikely. In machine-readable Tables 1 and 2, we give the full orbit-linked historical light curve of OJ 287 as well as the dense monitoring sample of Krakow.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 122

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