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Hybrid Comptonizati...
Hybrid Comptonization and Electron-Positron Pair Production in the Black-hole X-Ray Binary MAXI J1820+070
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- Zdziarski, Andrzej A. (författare)
- Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland.
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- Jourdain, Elisabeth (författare)
- CNRS, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France.;IRAP, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France.;Univ Toulouse, Toulouse, France.;UPS OMP, Toulouse, France.
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- Lubinski, Piotr (författare)
- Univ Zielona Gora, Inst Phys, Licealna 9, PL-65417 Zielona Gora, Poland.
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- Szanecki, Michal (författare)
- Univ Lodz, Fac Phys & Appl Informat, Pomorska 149-153, PL-90236 Lodz, Poland.
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- Niedzwiecki, Andrzej (författare)
- Univ Lodz, Fac Phys & Appl Informat, Pomorska 149-153, PL-90236 Lodz, Poland.
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- Veledina, Alexandra (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia.,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Russian Academy of Sciences, Russia
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- Poutanen, Juri (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.; Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia.,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Russian Academy of Sciences, Russia
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- Dzielak, Marta A. (författare)
- Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland.
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- Roques, Jean-Pierre (författare)
- CNRS, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France.;IRAP, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France.;Univ Toulouse, Toulouse, France.;UPS OMP, Toulouse, France.
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Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland CNRS, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France.;IRAP, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France.;Univ Toulouse, Toulouse, France.;UPS OMP, Toulouse, France. (creator_code:org_t)
- 2021-06-07
- 2021
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 914:1
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We study X-ray and soft gamma-ray spectra from the hard state of the accreting black-hole binary MAXI J1820+070. We perform an analysis of two joint spectra from NuSTAR and INTEGRAL, covering the range of 3-650 keV, and of an average joint spectrum over the rise of the hard state, covering the 3-2200 keV range. The spectra are well modeled by Comptonization of soft seed photons. However, the distributions of the scattering electrons are not purely thermal; we find they have substantial high-energy tails, well modeled as power laws. The photon tail in the average spectrum is detected well beyond the threshold for electron-positron pair production, 511 keV. This allows us to calculate the rate of the electron-positron pair production and put a lower limit on the size of the source from pair equilibrium. At the fitted Thomson optical depth of the Comptonizing plasma, the limit is about 4 gravitational radii. If we adopt the sizes estimated by us from the reflection spectroscopy of >20 gravitational radii, the fractional pair abundance becomes much less than unity. The low pair abundance is confirmed by the lack of both an annihilation feature and of a pair absorption cutoff above 511 keV in the average spectrum.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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