Results 11 to 20 of about 191,283 (348)

Swift Monitoring of M51: A 38 day Superorbital Period for the Pulsar ULX7 and a New Transient Ultraluminous X-Ray Source [PDF]

Astrophysical Journal, 2020
We present the results from a monitoring campaign made with the Neil Gehrels Swift Observatory of the M51 galaxies, which contain several variable ultraluminous X-ray sources (ULXs). The ongoing campaign started in 2018 May, and we report here on ∼1.5 yr
Murray Brightman, Hannah Earnshaw, Felix Fürst, Fiona A. Harrison, Marianne Heida, Gianluca Israel, Sean Pike, Daniel Stern, Dominic J. Walton   +8 more
openalex   +3 more sources

Are transient X-ray sources cataclysmic binaries? [PDF]

The Science of Nature, 1976
Michael Reinhardt
openalex   +3 more sources

Extragalactic fast X-ray transient candidates discovered by Chandra (2014-2022) [PDF]

Astronomy & Astrophysics, 2023
Extragalactic fast X-ray transients (FXTs) are short flashes of X-ray photons of unknown origin that last a few minutes to hours. We extend the search for extragalactic FXTs from Quirola et al.
J. Quirola-V'asquez, F. Bauer, P. Jonker, W. Brandt, G. Yang, A. Levan, Y. Xue, D. Eappachen, E. Camacho, M. Ravasio, X. Zheng, B. Luo   +11 more
semanticscholar   +1 more source

Extragalactic fast X-ray transient candidates discovered by Chandra (2000-2014) [PDF]

Astronomy & Astrophysics, 2022
Extragalactic Fast X-ray Transients (FXRTs) are short flashes of X-ray photons spanning a few seconds to hours, with an uncertain origin. Our ignorance about their physical mechanisms and progenitor systems is due in part to the lack of clear multi ...
J. Quirola-Vásquez, F. Bauer, P. Jonker, W. Brandt, G. Yang, A. Levan, Y. Xue, D. Eappachen, X. Zheng, B. Luo   +9 more
semanticscholar   +1 more source

Hard X-ray transient grating spectroscopy on bismuth germanate [PDF]

Nature Photonics, 2021
Optical-domain transient grating (TG) spectroscopy is a versatile background-free four-wave-mixing technique that is used to probe vibrational, magnetic and electronic degrees of freedom in the time domain1.
J. Rouxel, D. Fainozzi, Roman Mankowsky, B. Rösner, G. Seniutinas, R. Mincigrucci, S. Catalini, L. Foglia, R. Cucini, F. Döring, A. Kubec, F. Koch, F. Bencivenga, A. Haddad, A. Gessini, A. Maznev, C. Cirelli, S. Gerber, B. Pedrini, G. Mancini, E. Razzoli, Max Burian, H. Ueda, G. Pamfilidis, E. Ferrari, Yunpei Deng, A. Mozzanica, P. Johnson, D. Ozerov, M. G. Izzo, C. Bottari, C. Arrell, E. Divall, S. Zerdane, M. Sander, G. Knopp, P. Beaud, H. Lemke, C. Milne, C. David, R. Torre, M. Chergui, K. Nelson, C. Masciovecchio, U. Staub, L. Patthey, C. Svetina   +46 more
semanticscholar   +1 more source

The EXTraS project: Exploring the X-ray transient and variable sky [PDF]

Astronomy & Astrophysics, 2021
Temporal variability in flux and spectral shape is ubiquitous in the X-ray sky and carries crucial information about the nature and emission physics of the sources.
A. De Luca, R. Salvaterra, A. Belfiore, S. Carpano, D. D’Agostino, F. Haberl, G. Israel, D. Law-Green, G. Lisini, M. Marelli, G. Novara, A. Read, G. Rodriguez-Castillo, S. Rosen, D. Salvetti, A. Tiengo, G. Vianello, M. Watson, C. Delvaux, T. Dickens, P. Esposito, J. Greiner, H. Hämmerle, A. Kreikenbohm, S. Kreykenbohm, M. Oertel, D. Pizzocaro, J. Pye, S. Sandrelli, B. Stelzer, J. Wilms, F. Zagaria   +31 more
semanticscholar   +1 more source

The transient ultraluminous X-ray source, ULX-4, in M51 [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACT We present the results of a temporal and spectral analysis of the transient source ULX-4 in the galaxy M51. The data used were drawn from Chandra, XMM–Newton, and Swift-XRT archives, spanning the years 2000–2019.. The X-ray flux of the source is seen to vary by two orders of magnitudes within a month but a short-term variability
S Allak, A Akyuz, İ Akkaya Oralhan, S Avdan, N Aksaker, A Vinokurov, F Soydugan, E Sonbas, K S Dhuga   +8 more
openaire   +6 more sources

Transient X-ray source A1118—61 [PDF]

Nature, 1976
THE transient X-ray source Ariel 1118—61 was discovered late in 1974 (refs 1, 2). It has been suggested3 that this source may be associated with the long period Mira-type variable RS Cen, which is located within the error box for the X-ray source.
P. J. N. DAVISON, P. W. SANFORD
openaire   +1 more source

The Luminosity Phase Space of Galactic and Extragalactic X-Ray Transients Out to Intermediate Redshifts

The Astrophysical Journal, 2023
We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transient/variable ...
Ava Polzin, Raffaella Margutti, Deanne L. Coppejans, Katie Auchettl, Kim L. Page, Georgios Vasilopoulos, Joe S. Bright, Paolo Esposito, Peter K. G. Williams, Koji Mukai, Edo Berger   +10 more
doaj   +1 more source

THE SWIFT/BAT HARD X-RAY TRANSIENT MONITOR [PDF]

, 2006
The Swift/Burst Alert Telescope (BAT) hard X-ray transient monitor provides near real-time coverage of the X-ray sky in the energy range 15–50 keV.
H. Krimm, S. Holland, R. Corbet, A. Pearlman, P. Romano, J. Kennea, J. Bloom, S. Barthelmy, W. Baumgartner, J. Cummings, N. Gehrels, A. Lien, C. Markwardt, D. Palmer, T. Sakamoto, M. Stamatikos, T. Ukwatta   +16 more
semanticscholar   +1 more source