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Dust properties in the cold and hot gas phases of the ATLAS3D early-type galaxies as revealed by AKARI

(2018)

Authors:

T Kokusho, H Kaneda, M Bureau, T Suzuki, K Murata, A Kondo, M Yamagishi, T Tsuchikawa, T Furuta
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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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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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