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 ultra-relativistic outflows in a neutron star X-ray binary

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2018)

Authors:

SE 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 which 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 which were performed with the RXTE mission. We find that the ejection of the ultra-relativistic 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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