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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Sara Motta

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Sub department

  • Astrophysics
sara.motta@physics.ox.ac.uk
  • About
  • Publications

IGR J17451–3022: A dipping and eclipsing low mass X-ray binary

Astronomy & Astrophysics EDP Sciences 589 (2016) a42

Authors:

E Bozzo, P Pjanka, P Romano, A Papitto, C Ferrigno, S Motta, AA Zdziarski, F Pintore, T Di Salvo, L Burderi, D Lazzati, G Ponti, L Pavan
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Quasi periodic oscillations in black hole binaries

Astronomische Nachrichten Wiley 337:4‐5 (2016) 398-403
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Spectral and timing evolution of the bright failed outburst of the transient black hole Swift J174510.8−262411

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 456:4 (2016) 3585-3595

Authors:

M Del Santo, TM Belloni, JA Tomsick, B Sbarufatti, M Cadolle Bel, P Casella, A Castro-Tirado, S Corbel, V Grinberg, J Homan, E Kalemci, S Motta, T Muñoz-Darias, K Pottschmidt, J Rodriguez, J Wilms
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The outburst decay of the low magnetic field magnetar SWIFT J1822.3−1606: phase-resolved analysis and evidence for a variable cyclotron feature

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 456:4 (2016) 4145-4155

Authors:

Guillermo A Rodríguez Castillo, Gian Luca Israel, Andrea Tiengo, David Salvetti, Roberto Turolla, Silvia Zane, Nanda Rea, Paolo Esposito, Sandro Mereghetti, Rosalba Perna, Luigi Stella, José A Pons, Sergio Campana, Diego Götz, Sara Motta
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Time resolved X-ray spectroscopy of V404 Cyg during the June 2015 outburst

Proceedings of Science 2016-October (2016)

Authors:

C Sánchez-Fernández, J Kajava, SE Motta, E Kuulkers

Abstract:

Hard X-ray spectra of black hole binaries (BHB) are produced by the inverse Comptonization of soft seed photons by hot electrons near the black hole. The slope of the resulting energy spectra is governed by two main parameters: the electron temperature (Te) and the optical depth (τ) of the emitting plasma. The extremely bright outburst of V404 Cyg in June 2015, provides a unique data set to perform time resolved spectroscopy and study in detail the evolution of the parameters describing the Comptonizing plasma. We present here the results of IBIS/ISGRI spectral analysis in the 20–200 keV energy range over the period 18–28 June 2015.

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