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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.

Fraser Cowie

Graduate Student

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • MeerKAT
  • Pulsars, transients and relativistic astrophysics
fraser.cowie@physics.ox.ac.uk
  • About
  • Publications

Flaring Masers and Pumping

Proceedings of the International Astronomical Union Cambridge University Press (CUP) 18:S380 (2022) 422-429

Authors:

MD Gray, S Etoka, B Pimpanuwat, AMS Richards, FJ Cowie

Abstract:

AbstractWe briefly consider the history of maser variability, and of flaring variability specifically. We consider six proposed flare generation mechanisms, and model them computationally with codes that include saturation and 3-D structure (the last mechanism is modelled in 1-D). Fits to observational light curves have been made for some sources, and we suggest that a small number of observational parameters can diagnose the flare mechanism in many cases. The strongest flares arise from mechanisms that can increase the number density of inverted molecules in addition to by geometrical effects, and in events where unsaturated quiescent masers become saturated during the flare.
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