Quasi-periodic X-ray eruptions years after a nearby tidal disruption event
Nature Nature Research 634:8035 (2024) 804-808
Authors:
M Nicholl, DR Pasham, A Mummery, M Guolo, K Gendreau, GC Dewangan, EC Ferrara, R Remillard, C Bonnerot, J Chakraborty, A Hajela, VS Dhillon, AF Gillan, J Greenwood, ME Huber, A Janiuk, G Salvesen, S van Velzen, A Aamer, KD Alexander, CR Angus, Z Arzoumanian, K Auchettl, E Berger, JH GillandersAbstract:
Quasi-periodic eruptions (QPEs) are luminous bursts of soft X-rays from the nuclei of galaxies, repeating on timescales of hours to weeks1–5. The mechanism behind these rare systems is uncertain, but most theories involve accretion disks around supermassive black holes (SMBHs) undergoing instabilities6–8 or interacting with a stellar object in a close orbit9–11. It has been suggested that this disk could be created when the SMBH disrupts a passing star8, 11, implying that many QPEs should be preceded by observable tidal disruption events (TDEs). Two known QPE sources show long-term decays in quiescent luminosity consistent with TDEs4, 12 and two observed TDEs have exhibited X-ray flares consistent with individual eruptions13, 14. TDEs and QPEs also occur preferentially in similar galaxies15. However, no confirmed repeating QPEs have been associated with a spectroscopically confirmed TDE or an optical TDE observed at peak brightness. Here we report the detection of nine X-ray QPEs with a mean recurrence time of approximately 48 h from AT2019qiz, a nearby and extensively studied optically selected TDE16. We detect and model the X-ray, ultraviolet (UV) and optical emission from the accretion disk and show that an orbiting body colliding with this disk provides a plausible explanation for the QPEs.Determination of the Relative Sign of the Higgs Boson Couplings to W and Z Bosons Using WH Production via Vector-Boson Fusion with the ATLAS Detector
Physical Review Letters American Physical Society (APS) 133:14 (2024) 141801
Authors:
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Ye, S Ye, X Ye, Y Yeh, I Yeletskikh, BK Yeo, MR Yexley, P Yin, K Yorita, S Younas, CJS Young, C Young, C Yu, Y Yu, M Yuan, R Yuan, L Yue, M Zaazoua, B Zabinski, E Zaid, ZK Zak, T Zakareishvili, N Zakharchuk, S Zambito, JA Zamora Saa, J Zang, D Zanzi, O Zaplatilek, C Zeitnitz, H Zeng, JC Zeng, DT Zenger, O Zenin, T Ženiš, S Zenz, S Zerradi, D Zerwas, M Zhai, DF Zhang, J Zhang, J Zhang, K Zhang, L Zhang, P Zhang, R Zhang, S Zhang, S Zhang, T Zhang, X Zhang, X Zhang, Y Zhang, Y Zhang, Y Zhang, Z Zhang, Z Zhang, H Zhao, T Zhao, Y Zhao, Z Zhao, A Zhemchugov, J Zheng, K Zheng, X Zheng, Z Zheng, D Zhong, B Zhou, H Zhou, N Zhou, Y Zhou, CG Zhu, J Zhu, Y Zhu, Y Zhu, X Zhuang, K Zhukov, V Zhulanov, NI Zimine, J Zinsser, M Ziolkowski, L Živković, A Zoccoli, K Zoch, TG Zorbas, O Zormpa, W Zou, L ZwalinskiSensor response and radiation damage effects for 3D pixels in the ATLAS IBL Detector
Journal of Instrumentation IOP Publishing 19:10 (2024) P10008
Authors:
G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN AgarasAbstract:
Pixel sensors in 3D technology equip the outer ends of the staves of the Insertable B Layer (IBL), the innermost layer of the ATLAS Pixel Detector, which was installed before the start of LHC Run 2 in 2015. 3D pixel sensors are expected to exhibit more tolerance to radiation damage and are the technology of choice for the innermost layer in the ATLAS tracker upgrade for the HL-LHC programme. While the LHC has delivered an integrated luminosity of ≃ 235 fb-1 since the start of Run 2, the 3D sensors have received a non-ionising energy deposition corresponding to a fluence of ≃ 8.5 × 1014 1 MeV neutron-equivalent cm-2 averaged over the sensor area. This paper presents results of measurements of the 3D pixel sensors' response during Run 2 and the first two years of Run 3, with predictions of its evolution until the end of Run 3 in 2025. Data are compared with radiation damage simulations, based on detailed maps of the electric field in the Si substrate, at various fluence levels and bias voltage values. These results illustrate the potential of 3D technology for pixel applications in high-radiation environments.Late-Time Supernovae Radio Re-brightening in the VAST Pilot Survey
(2024)
Authors:
Kovi Rose, Assaf Horesh, Tara Murphy, David L Kaplan, Itai Sfaradi, Stuart D Ryder, Robert J Aloisi, Dougal Dobie, Laura Driessen, Rob Fender, David A Green, James K Leung, Emil Lenc, Hao Qiu, David Williams-BaldwinCharacterizing the Rapid Hydrogen Disappearance in SN 2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties
The Astrophysical Journal American Astronomical Society 974:2 (2024) 316