Zobrazeno 1 - 10
of 186
pro vyhledávání: '"Suková P"'
Autor:
Pasham, Dheeraj, Coughlin, Eric, Nixon, Chris, Zajacek, Michal, Sukova, Petra, Karas, Vladimir, Wevers, Thomas, Tombesi, Francesco
SwJ023017.0+283603 (SwJ0230) exhibited soft X-ray (0.3-1.0 keV) eruptions recurring roughly every 22 days. We present results from an extended monitoring campaign of SwJ0230 using Swift, NICER, and deep XMM-Newton observations. Our main findings are:
Externí odkaz:
http://arxiv.org/abs/2411.05948
Autor:
Suková, Petra, Tombesi, Francesco, Pasham, Dheeraj R., Zajaček, Michal, Wevers, Thomas, Ryu, Taeho, Linial, Itai, Franchini, Alessia
In the last few years, a mysterious new class of astrophysical objects has been uncovered. These are spatially coincident with the nuclei of external galaxies and show X-ray variations that repeat on timescales of minutes to a month. They manifest in
Externí odkaz:
http://arxiv.org/abs/2411.04592
Autor:
Zajaček, Michal, Suková, Petra, Karas, Vladimír, Pasham, Dheeraj R., Tombesi, Francesco, Kurfürst, Petr, Best, Henry, Garland, Izzy, Labaj, Matúš, Pikhartová, Monika
The first detection of the quasiperiodic ultrafast outflow in the ASASSN-20qc system was reported by Pasham et al. (2024). The outflow is revealed in the soft X-ray spectra as an absorption feature, which is periodically enhanced every $ \sim 8.3$ da
Externí odkaz:
http://arxiv.org/abs/2410.12090
Autor:
Pasham, Dheeraj R., Tombesi, Francesco, Sukova, Petra, Zajacek, Michal, Rakshit, Suvendu, Coughlin, Eric, Kosec, Peter, Karas, Vladimir, Masterson, Megan, Mummery, Andrew, Holoien, Thomas W. -S., Guolo, Muryel, Hinkle, Jason, Ripperda, Bart, Witzany, Vojtech, Shappee, Ben, Kara, Erin, Horesh, Assaf, van Velzen, Sjoert, Sfaradi, Itai, Kaplan, David L., Burger, Noam, Murphy, Tara, Remillard, Ronald, Steiner, James F., Wevers, Thomas, Arcodia, Riccardo, Buchner, Johannes, Merloni, Andrea, Malyali, Adam, Fabian, Andy, Fausnaugh, Michael, Daylan, Tansu, Altamirano, Diego, Payne, Anna, Ferrara, E. C.
Binaries containing a compact object orbiting a supermassive black hole are thought to be precursors of gravitational wave events, but their identification has been extremely challenging. Here, we report quasi-periodic variability in X-ray absorption
Externí odkaz:
http://arxiv.org/abs/2402.10140
Autor:
Pasham, Dheeraj R., Coughlin, Eric R., Zajacek, Michal, Linial, Itai, Sukova, Petra, Nixon, Christopher J., Janiuk, Agnieszka, Sniegowska, Marzena, Witzany, Vojtech, Karas, Vladimir, Krumpe, M., Altamirano, Diego, Wevers, Thomas, Arcodia, Riccardo
Quasi-periodic Eruptions (QPEs) represent a novel class of extragalactic X-ray transients that are known to repeat at roughly regular intervals of a few hours to days. Their underlying physical mechanism is a topic of heated debate, with most models
Externí odkaz:
http://arxiv.org/abs/2402.09690
General-relativistic magneto-hydrodynamical (GRMHD) simulations of accreting black holes suggest that the accretion flows form toroidal structures embedded in a large scale component of magnetic field, which becomes organized on length-scales exceedi
Externí odkaz:
http://arxiv.org/abs/2312.04149
Autor:
Guolo, Muryel, Pasham, Dheeraj R., Zajaček, Michal, Coughlin, Eric R., Gezari, Suvi, Suková, Petra, Wevers, Thomas, Witzany, Vojtěch, Tombesi, Francesco, van Velzen, Sjoert, Alexander, Kate D., Yao, Yuhan, Arcodia, Riccardo, Karas, Vladimır, Miller-Jones, James, Remillard, Ronald, Gendreau, Keith, Ferrara, Elizabeth C.
Publikováno v:
Nat Astron (2024)
Galactic nuclei showing recurrent phases of activity and quiescence have recently been discovered, with recurrence times as short as a few hours to a day -- known as quasi-periodic X-ray eruption (QPE) sources -- to as long as hundreds to a thousand
Externí odkaz:
http://arxiv.org/abs/2309.03011
Autor:
Zajaček, M., Czerny, B., Jaiswal, V. K., Štolc, M., Karas, V., Pandey, A., Pasham, D. R., Śniegowska, M., Witzany, V., Suková, P., Münz, F., Werner, N., Řípa, J., Merc, J., Labaj, M., Kurfürst, P., Krtička, J.
In this review (the third in the series focused on a small two-band UV-photometry mission), we assess possibilities for a small UV two-band photometry mission in studying accreting supermassive black holes (SMBHs; mass range $\sim 10^6$-$10^{10}\,M_{
Externí odkaz:
http://arxiv.org/abs/2306.15082
The close neighbourhood of a supermassive black hole contains not only the accreting gas and dust but also stellar-sized objects, such as late-type and early-type stars and compact remnants that belong to the nuclear star cluster. When passing throug
Externí odkaz:
http://arxiv.org/abs/2102.08135
Autor:
D. R. Pasham, E. R. Coughlin, M. Zajaček, Itai Linial, Petra Suková, C. J. Nixon, Agnieszka Janiuk, M. Sniegowska, Vojtěch Witzany, V. Karas, M. Krumpe, D. Altamirano, T. Wevers, Riccardo Arcodia
Publikováno v:
The Astrophysical Journal Letters, Vol 963, Iss 2, p L47 (2024)
Quasiperiodic eruptions (QPEs) represent a novel class of extragalactic X-ray transients that are known to repeat at roughly regular intervals of a few hours to days. Their underlying physical mechanism is a topic of heated debate, with most models p
Externí odkaz:
https://doaj.org/article/2f3d3ef2748d46ad8b0d66a78af4ce6c
