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Limits on pair production and multizone Comptonization: the broad-band X/gamma-ray spectrum of XTE J1550-564 revisited
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).ORCID-id: 0000-0003-4378-8785
Rekke forfattare: 32016 (engelsk)Inngår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 456, nr 4, s. 4354-4363Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

At high luminosities black hole binaries show spectra with a strong disc component accompanied by an equally strong tail where at least some of the electrons are non-thermal. We reanalyse the simultaneous ASCA-RXTE-OSSE data from the 1998 outburst of XTE J1550-564, which span 0.7-1000 keV and remain the best data available of a black hole binary in this state. We reassess the importance of electron-positron pair production using a realistically high value of the source compactness for the first time. The lack of an observable annihilation line together with the observed gamma-ray flux beyond 511 keV constrains the maximum electron Lorentz factor to be <= 10, and the slope of the injected electrons to <= 2.5. We also use the fast (10-50 Hz) variability spectrum to constrain the spatial dependence of the electron heating and acceleration. We find that the spectrum of the fast variability is consistent with being fully thermal, so that the observed non-thermal emission is produced from further out in the flow.

sted, utgiver, år, opplag, sider
2016. Vol. 456, nr 4, s. 4354-4363
Emneord [en]
accretion, accretion discs, X-rays: binaries, X-rays: individual (XTE J1550-564)
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-129202DOI: 10.1093/mnras/stv2909ISI: 000372265800072OAI: oai:DiVA.org:su-129202DiVA, id: diva2:934735
Tilgjengelig fra: 2016-06-09 Laget: 2016-04-17 Sist oppdatert: 2022-03-09bibliografisk kontrollert

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