A tidal disruption event coincident with a high-energy neutrino
Nature Astronomy Springer Nature 5:5 (2021) 510-518
Authors:
Robert Stein, Sjoert van Velzen, Robert Fender, Marek KowalskiAbstract:
Cosmic neutrinos provide a unique window into the otherwise hidden mechanism of particle acceleration in astrophysical objects. The IceCube Collaboration recently reported the likely association of one high-energy neutrino with a flare from the relativistic jet of an active galaxy pointed towards the Earth. However a combined analysis of many similar active galaxies revealed no excess from the broader population, leaving the vast majority of the cosmic neutrino flux unexplained. Here we present the likely association of a radio-emitting tidal disruption event, AT2019dsg, with a second high-energy neutrino. AT2019dsg was identified as part of our systematic search for optical counterparts to high-energy neutrinos with the Zwicky Transient Facility. The probability of finding any coincident radio-emitting tidal disruption event by chance is 0.5%, while the probability of finding one as bright in bolometric energy flux as AT2019dsg is 0.2%. Our electromagnetic observations can be explained through a multizone model, with radio analysis revealing a central engine, embedded in a UV photosphere, that powers an extended synchrotron-emitting outflow. This provides an ideal site for petaelectronvolt neutrino production. Assuming that the association is genuine, our observations suggest that tidal disruption events with mildly relativistic outflows contribute to the cosmic neutrino flux.Measurements of WH and ZH production in the H -> bb decay channel in pp collisions at 13
EUROPEAN PHYSICAL JOURNAL C 81:2 (2021) ARTN 178
Authors:
M Aaboud, G Aad, B Abbott, O Abdinov, B Abeloos, DK Abhayasinghe, SH Abidi, OS AbouZeid, NL Abraham, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, S Adachi, L Adamczyk, J Adelman, M Adersberger, A Adiguzel, T Adye, AA Affolder, Y Afik, C Agheorghiesei, JA Aguilar-Saavedra, F Ahmadov, G Aielli, S Akatsuka, TPA Akesson, E Akilli, AV Akimov, GL Alberghi, J Albert, P Albicocco, MJ Alconada Verzini, S Alderweireldt, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, M Alhroob, B Ali, G Alimonti, J Alison, SP Alkire, C Allaire, BMM Allbrooke, BW Allen, PP Allport, A Aloisio, A Alonso, F Alonso, C Alpigiani, AA Alshehri, MI Alstaty, B Alvarez Gonzalez, D Alvarez Piqueras, MG Alviggi, BT Amadio, Y Amaral Coutinho, L Ambroz, C Amelung, D Amidei, SP Amor Dos Santos, S Amoroso, CS Amrouche, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, JK Anders, KJ Anderson, A Andreazza, V Andrei, CR Anelli, S Angelidakis, I Angelozzi, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, M Antonelli, DJA Antrim, F Anulli, M Aoki, JA Aparisi Pozo, L Aperio Bella, G Arabidze, JP Araque, V Araujo Ferraz, R Araujo Pereira, ATH Arce, RE Ardell, FA Arduh, J-F Arguin, S Argyropoulos, AJ Armbruster, LJ Armitage, A Armstrong, O Arnaez, H Arnold, M Arratia, O Arslan, A Artamonov, G Artoni, S Artz, S Asai, N Asbah, A Ashkenazi, EM Asimakopoulou, L Asquith, K Assamagan, R Astalos, RJ Atkin, M Atkinson, NB Atlay, K Augsten, G Avolio, R Avramidou, MK Ayoub, G Azuelos, AE Baas, MJ Baca, H Bachacou, K Bachas, M Backes, P Bagnaia, M Bahmani, H Bahrasemani, AJ Bailey, JT Baines, M Bajic, C Bakalis, OK Baker, PJ Bakker, D Bakshi Gupta, EM Baldin, P Balek, F Balli, WK Balunas, J Balz, E Banas, A Bandyopadhyay, S Banerjee, AAE Bannoura, L Barak, WM Barbe, EL Barberio, D Barberis, M Barbero, T Barillari, M-S Barisits, J Barkeloo, T Barklow, N Barlow, R Barnea, SL Barnes, BM Barnett, RM Barnett, Z Barnovska-Blenessy, A Baroncelli, G Barone, AJ Barr, L Barranco Navarro, F Barreiro, J Barreiro 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D Shoaleh Saadi, MJ Shochet, S Shojaii, DR Shope, S Shrestha, E Shulga, P Sicho, AM Sickles, PE Sidebo, E Sideras Haddad, O Sidiropoulou, A Sidoti, F Siegert, Dj Sijacki, J Silva, Silva M Jr, MV Silva Oliveira, SB Silverstein, L Simic, S Simion, E Simioni, M Simon, R Simoniello, P Sinervo, NB Sinev, M Sioli, G Siragusa, I Siral, S Yu Sivoklokov, J Sjoelin, P Skubic, M Slater, T Slavicek, M Slawinska, K Sliwa, R Slovak, V Smakhtin, BH Smart, J Smiesko, N Smirnov, S Yu Smirnov, Y Smirnov, LN Smirnova, O Smirnova, JW Smith, MNK Smith, M Smizanska, K Smolek, A Smykiewicz, AA Snesarev, IM Snyder, S Snyder, R Sobie, AM Soffa, A Soffer, A Sogaard, DA Soh, G Sokhrannyi, CA Solans Sanchez, M Solar, E Yu Soldatov, U Soldevila, AA Solodkov, A Soloshenko, OV Solovyanov, V Solovyev, P Sommer, H Son, W Song, WY Song, A Sopczak, F Sopkova, D Sosa, CL Sotiropoulou, S Sottocornola, R Soualah, AM Soukharev, D South, BC Sowden, S Spagnolo, M Spalla, M Spangenberg, F Spano, D Sperlich, F Spettel, TM 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N Tsirintanis, V Tsiskaridze, EG Tskhadadze, II Tsukerman, V Tsulaia, S Tsuno, D Tsybychev, Y Tu, A Tudorache, V Tudorache, TT Tulbure, AN Tuna, S Turchikhin, D Turgeman, I Turk Cakir, R Turra, PM Tuts, E Tzovara, G Ucchielli, I Ueda, M Ughetto, F Ukegawa, G Unal, A Undrus, G Unel, FC Ungaro, Y Unno, K Uno, J Urban, P Urquijo, P Urrejola, G Usai, J Usui, L Vacavant, V Vacek, B Vachon, KOH Vadla, A Vaidya, C Valderanis, E Valdes Santurio, M Valente, S Valentinetti, A Valero, L Valery, RA Vallance, A Vallier, JA Valls Ferrer, TR Van Daalen, H Van der Graaf, P Van Gemmeren, J Van Nieuwkoop, I Van Vulpen, M Vanadia, W Vandelli, A Vaniachine, P Vankov, R Vari, EW Varnes, C Varni, T Varol, D Varouchas, KE Varvell, GA Vasquez, JG Vasquez, F Vazeille, D Vazquez Furelos, T Vazquez Schroeder, J Veatch, V Vecchio, LM Veloce, F Veloso, S Veneziano, A Ventura, M Venturi, N Venturi, V Vercesi, M Verducci, CM Vergel Infante, C Vergis, W Verkerke, AT Vermeulen, JC Vermeulen, MC Vetterli, N Viaux 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Wengler, S Wenig, N Wermes, MD Werner, P Werner, M Wessels, TD Weston, K Whalen, NL Whallon, AM Wharton, AS White, A White, MJ White, R White, D Whiteson, BW Whitmore, FJ Wickens, W Wiedenmann, M Wielers, C Wiglesworth, LAM Wiik-Fuchs, A Wildauer, F Wilk, HG Wilkens, LJ Wilkins, HH Williams, S Williams, C Willis, S Willocq, JA Wilson, I Wingerter-Seez, E Winkels, F Winklmeier, OJ Winston, BT Winter, M Wittgen, M Wobisch, A Wolf, TMH Wolf, R Wolff, MW Wolter, H Wolters, VWS Wong, NL Woods, SD Worm, BK Wosiek, KW Wozniak, K Wraight, M Wu, SL Wu, X Wu, Y Wu, TR Wyatt, BM Wynne, S Xella, Z Xi, L Xia, D Xu, H Xu, L Xu, T Xu, W Xu, B Yabsley, S Yacoob, K Yajima, DP Yallup, D Yamaguchi, Y Yamaguchi, A Yamamoto, T Yamanaka, F Yamane, M Yamatani, T Yamazaki, Y Yamazaki, Z Yan, HJ Yang, HT Yang, S Yang, Y Yang, Z Yang, W-M Yao, YC Yap, Y Yasu, E Yatsenko, J Ye, S Ye, I Yeletskikh, E Yigitbasi, E Yildirim, K Yorita, K Yoshihara, CJS Young, C Young, J Yu, J Yu, X Yue, SPY Yuen, B Zabinski, G Zacharis, E Zaffaroni, R Zaidan, AM Zaitsev, T Zakareishvili, N Zakharchuk, J Zalieckas, S Zambito, D Zanzi, DR Zaripovas, SV Zeissner, C Zeitnitz, G Zemaityte, JC Zeng, Q Zeng, O Zenin, D Zerwas, M Zgubic, DF Zhang, D Zhang, F Zhang, G Zhang, H Zhang, J Zhang, L Zhang, L Zhang, M Zhang, P Zhang, R Zhang, R Zhang, X Zhang, Y Zhang, Z Zhang, P Zhao, X Zhao, Y Zhao, Z Zhao, A Zhemchugov, B Zhou, C Zhou, L Zhou, MS Zhou, M Zhou, N Zhou, Y Zhou, CG Zhu, HL Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, K Zhukov, V Zhulanov, A Zibell, D Zieminska, NI Zimine, S Zimmermann, Z Zinonos, M Zinser, M Ziolkowski, G Zobernig, A Zoccoli, K Zoch, TG Zorbas, R Zou, M Zur Nedden, L Zwalinski, ATLAS CollaborationRadio and optical observations of the possible AE Aqr twin, LAMOST J024048.51+195226.9
Monthly Notices of the Royal Astronomical Society Royal Astronomical Society 503:3 (2021) 3692-3697
Authors:
Ml Pretorius, Dm Hewitt, Pa Woudt, Robert Fender, I Heywood, C Knigge, Jca Miller-Jones, Dah Buckley, Hl Worters, Sb Potter, Dra WilliamsAbstract:
It was recently proposed that the cataclysmic variable (CV) LAMOST J024048.51+195226.9 may be a twin to the unique magnetic propeller system AE Aqr. If this is the case, two predictions are that it should display a short period white dwarf spin modulation, and that it should be a bright radio source. We obtained follow-up optical and radio observations of this CV, in order to see if this holds true. Our optical high-speed photometry does not reveal a white dwarf spin signal, but lacks the sensitivity to detect a modulation similar to the 33鈥塻 spin signal seen in AE Aqr. We detect the source in the radio, and measure a radio luminosity similar to that of AE Aqr and close to the highest so far reported for a CV. We also find good evidence for radio variability on a time-scale of tens of minutes. Optical polarimetric observations produce no detection of linear or circular polarization. While we are not able to provide compelling evidence, our observations are all consistent with this object being a propeller system.Fast infrared variability from the black hole candidate MAXI J1535-571 and tight constraints on the modelling
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 503:1 (2021) 614-624
Authors:
FM Vincentelli, P Casella, DM Russell, MC Baglio, A Veledina, T Maccarone, J Malzac, R Fender, K O'Brien, P UttleyPhotometric and spectroscopic evolution of the interacting transient AT 2016jbu (Gaia16cfr)
(2021)