Gamma-ray astronomy

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On the maximum energy of protons in the hotspots of AGN jets

EPJ Web of Conferences EDP Sciences 210 (2019) 04006

Authors:

Anabella T Araudo, Anthony R Bell, James Matthews, Katherine Blundell
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Science Case for a Wide Field-of-View Very-High-Energy Gamma-Ray Observatory in the Southern Hemisphere

arXiv e-prints (2019)

Authors:

Samuel Timothy Spencer, A Albert, R Alfaro, H Ashkar, C Alvarez, J Álvarez, JC Arteaga-Velázquez, HA Ayala Solares, R Arceo, JA Bellido, S BenZvi, T Bretz, CA Brisbois, AM Brown, F Brun, KS Caballero-Mora, A Carosi, A Carrami nana, S Casanova, PM Chadwick, G Cotter, S Couti no De León, P Cristofari, S Dasso, E de la Fuente, BL Dingus, P Desiati, F de O Salles, V de Souza, D Dorner, JC Díaz-Vélez, JA García-González, MA DuVernois, G Di Sciascio, K Engel, H Fleischhack, N Fraija, S Funk, J-F Glicenstein, J Gonzalez, MM González, JA Goodman, JP Harding, A Haungs, J Hinton, B Hona, D Hoyos, P Huentemeyer, A Iriarte, A Jardin-Blicq, V Joshi, S Kaufmann, K Kawata, S Kunwar, J Lefaucheur, J-P Lenain, K Link, R López-Coto, V Marandon, M Mariotti, J Martínez-Castro, H Martínez-Huerta, M Mostafá, A Nayerhoda, L Nellen, E de O na Wilhelmi, RD Parsons, B Patricelli, A Pichel, Q Piel, E Prandini, E Pueschel, S Procureur, A Reisenegger, C Rivière, J Rodriguez, AC Rovero, G Rowell, EL Ruiz-Velasco, A Sandoval, M Santander, T Sako, TK Sako, K Satalecka, H Schoorlemmer, F Schüssler, M Seglar-Arroyo, AJ Smith, S Spencer, P Surajbali, E Tabachnick, AM Taylor, O Tibolla, I Torres, B Vallage, A Viana, JJ Watson, T Weisgarber, F Werner, R White, R Wischnewski, R Yang, A Zepeda, H Zhou

The Southern Wide-Field Gamma-Ray Observatory (SWGO): A Next-Generation Ground-Based Survey Instrument for VHE Gamma-Ray Astronomy

arXiv e-prints (2019)

Authors:

Samuel Timothy Spencer, P Abreu, A Albert, R Alfaro, C Alvarez, R Arceo, P Assis, F Barao, J Bazo, JF Beacom, J Bellido, S BenZvi, T Bretz, C Brisbois, AM Brown, F Brun, M Buscemi, KS Caballero Mora, P Camarri, A Carrami nana, S Casanova, A Chiavassa, R Conceiç ao, G Cotter, P Cristofari, S Dasso, A De Angelis, M De Maria, P Desiati, G Di Sciascio, JC Díaz Vélez, C Dib, B Dingus, D Dorner, M Doro, C Duffy, M DuVernois, R Engel, M Fernandez Alonso, H Fleischhack, P Fonte, N Fraija, S Funk, JA García-González, MM González, JA Goodman, T Greenshaw, JP Harding, A Haungs, B Hona, P Huentemeyer, A Insolia, A Jardin-Blicq, V Joshi, K Kawata, S Kunwar, G La Mura, J Lapington, JP Lenain, R López-Coto, K Malone, J Martinez-Castro, H Martínez-Huerta, L Mendes, E Moreno, M Mostafá, KCY Ng, MU Nisa, F Peron, A Pichel, M Pimenta, E Prandini, S Rainò, A Reisenegger, J Rodriguez, M Roth, A Rovero, E Ruiz-Velasco, T Sako, A Sandoval, M Santander, K Satalecka, M Schneider, H Schoorlemmer, F Schüssler, RC Shellard, A Smith, S Spencer, W Springer, P Surajbali, K Tollefson, B Tomé, I Torres, A Viana, T Weisgarber, R Wischnewski, A Zepeda, B Zhou, H Zhou

A connection between accretion states and the formation of ultra-relativistic outflows in a neutron star X-ray binary

(2018)

Authors:

SE Motta, RP Fender
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A connection between accretion states and the formation of ultrarelativistic outflows in a neutron star X-ray binary

Monthly Notices of the Royal Astronomical Society Oxford University Press 483:3 (2018) 3686-3699

Authors:

Sara Motta, RP Fender

Abstract:

The nearby accreting neutron star binary Sco X-1 is the closest example of ongoing relativistic jet production at high Eddington ratios. Previous radio studies have revealed that alongside mildly relativistic, radio-emitting ejecta, there is at times a much faster transfer of energy from the region of the accretion flow along the jet. The nature of this ultrarelativistic flow remains unclear and while there is some evidence for a similar phenomenon in other systems that might contain neutron stars, it has never been observed in a confirmed black hole system. We have compared these previous radio observations with a new analysis of simultaneous X-ray observations that were performed with the RXTE mission. We find that the ejection of the ultrarelativistic flow seems to be associated with the simultaneous appearance of two particular types of quasi-periodic oscillations in the X-ray power spectrum. In contrast, the mildly relativistic, radio-emitting outflows may be associated with flat-topped broad-band noise in the X-ray power spectrum. This is the first time a link, albeit tentative, has been found between these mysterious unseen flows and the accretion flow from which they are launched.
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