The twisted jets of Circinus X-1
Monthly Notices of the Royal Astronomical Society Oxford University Press 484:2 (2019) 1672-1686
Authors:
M Coriat, Rp Fender, C Tasse, O Smirnov, Ak Tzioumis, Jw BroderickAbstract:
We present the results of millimetre (33 and 35 GHz) and centimetre (2.1, 5.5, and 9.0 GHz) wavelength observations of the neutron star X-ray binary Circinus X-1, using the Australia Telescope Compact Array. We have used advanced calibration and de-convolution algorithms to overcome multiple issues due to intrinsic variability of the source and direction-dependent effects. The resulting centimetre and millimetre radio maps show spatially resolved jet structures from sub-arcsecond to arcminute angular scales. They represent the most detailed investigation to date of the interaction of the relativistic jet from the X-ray binary with the young supernova remnant in which it is embedded. Comparison of projected jet axes at different wavelengths indicates significant rotation of the jet axis with increasing angular scale. This either suggests interactions of the jet material with surrounding media, creating bends in the jet flow path, or jet precession. We explore the latter hypothesis by successfully modelling the observed jet path using a kinematic jet model. If precession is the right interpretation and our modelling is correct, the best-fitting parameters describe an accreting source with mildly relativistic ejecta (v = 0.5c), inclined close to the plane of the sky (i = 86 ◦ ) and precessing over a 5-yr period.The twisted jets of Circinus X-1
(2019)
Authors:
M Coriat, R Fender, C Tasse, O Smirnov, AK Tzioumis, JW BroderickSearch for pair production of Higgs bosons in the bb¯bb¯$$ b\overline{b}b\overline{b} $$ final state using proton-proton collisions at s=13$$ \sqrt{s}=13 $$ TeV with the ATLAS detector
Journal of High Energy Physics Springer Nature 2019:1 (2019) 30
Authors:
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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, Y Yang, Z Yang, W-M Yao, YC Yap, Y Yasu, E Yatsenko, KH Yau Wong, 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, I Yusuff, B Zabinski, G Zacharis, R Zaidan, AM Zaitsev, N Zakharchuk, J Zalieckas, S Zambito, D Zanzi, C Zeitnitz, G Zemaityte, JC Zeng, Q Zeng, O Zenin, D Zerwas, M Zgubič, 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, 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 ZwalinskiEveryone counts? Design considerations in online citizen science
Journal of Science Communication 18:1 (2019)
Authors:
H Spiers, A Swanson, L Fortson, BD Simmons, L Trouille, S Blickhan, C LintottAbstract:
© 2019, Scuola Internazionale Superiore di Studi Avanzati. Effective classification of large datasets is a ubiquitous challenge across multiple knowledge domains. One solution gaining in popularity is to perform distributed data analysis via online citizen science platforms, such as the Zooniverse. The resulting growth in project numbers is increasing the need to improve understanding of the volunteer experience; as the sustainability of citizen science is dependent on our ability to design for engagement and usability. Here, we examine volunteer interaction with 63 projects, representing the most comprehensive collection of online citizen science project data gathered to date. Together, this analysis demonstrates how subtle project design changes can influence many facets of volunteer interaction, including when and how much volunteers interact, and, importantly, who participates. Our findings highlight the tension between designing for social good and broad community engagement, versus optimizing for scientific and analytical efficiency.K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova
The Astrophysical Journal Letters American Astronomical Society 870:1 (2019) l1