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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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Progenitor candidate for the type II-P supernova SN 2018aoq in NGC 4151

(2018)

Authors:

D O'Neill, R Kotak, M Fraser, SA Sim, S Benetti, SJ Smartt, S Mattila, C Ashall, E Callis, N Elias-Rosa, M Gromadzki, SJ Prentice
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Investigating the properties of stripped-envelope supernovae, what are the implications for their progenitors?

(2018)

Authors:

SJ Prentice, C Ashall, PA James, L Short, PA Mazzali, D Bersier, PA Crowther, C Barbarino, T-W Chen, CM Copperwheat, MJ Darnley, L Denneau, N Elias-Rosa, M Fraser, L Galbany, A Gal-Yam, J Harmanen, DA Howell, G Hosseinzadeh, C Inserra, E Kankare, E Karamehmetoglu, GP Lamb, M Limongi, K Maguire, C McCully, F Olivares E., AS Piascik, G Pignata, DE Reichart, A Rest T Reynolds, Ó Rodríguez, JLO Saario, S Schulze, SJ Smartt, KW Smith, J Sollerman, B Stalder, M Sullivan, F Taddia, S Valenti, SD Vergani, SC Williams, DR Young
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Measurement of the $^8$B Solar Neutrino Flux in SNO+ with Very Low Backgrounds

(2018)

Authors:

The SNO Collaboration, :, M Anderson, S Andringa, S Asahi, M Askins, DJ Auty, N Barros, D Bartlett, F Barão, R Bayes, EW Beier, A Bialek, SD Biller, E Blucher, R Bonventre, M Boulay, E Caden, EJ Callaghan, J Caravaca, D Chauhan, M Chen, O Chkvorets, B Cleveland, C Connors, IT Coulter, MM Depatie, F Di Lodovico, F Duncan, J Dunger, E Falk, V Fischer, E Fletcher, R Ford, N Gagnon, K Gilje, C Grant, J Grove, AL Hallin, D Hallman, S Hans, J Hartnell, WJ Heintzelman, RL Helmer, JL Hernández-Hernández, B Hreljac, J Hu, AS Inácio, CJ Jillings, T Kaptanoglu, P Khaghani, JR Klein, R Knapik, LL Kormos, B Krar, C Kraus, CB Krauss, T Kroupova, I Lam, BJ Land, R Lane, A LaTorre, I Lawson, L Lebanowski, EJ Leming, A Li, J Lidgard, B Liggins, Y Liu, V Lozza, M Luo, S Maguire, A Maio, S Manecki, J Maneira, RD Martin, E Marzec, A Mastbaum, N McCauley, AB McDonald, P Mekarski, M Meyer, M Mlejnek, I Morton-Blake, S Nae, M Nirkko, HM O'Keeffe, GD Orebi Gann, MJ Parnell, J Paton, SJM Peeters, T Pershing, L Pickard, D Pracsovics, G Prior, A Reichold, R Richardson, M Rigan, J Rose, R Rosero, J Rumleskie, I Semenec, K Singh, P Skensved, MI Stringer, R Svoboda, B Tam, L Tian, J Tseng, E Turner, R Van Berg, JGC Veinot, CJ Virtue, E Vázquez-Jáuregui, J Wang, JJ Weigand, JR Wilson, P Woosaree, A Wright, JP Yanez, M Yeh, K Zuber, A Zummo
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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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