Sergey S. Tsygankov

View of the Hard X-ray Universe


My field of interest is observational relativistic astrophysics. The most extreme processes in the Universe are producing high energy photons in X- and gamma-ray domain. X-ray astronomy gives an opportunity to study physical processes in such extreme conditions (huge temperatures, densities and magnetic fields) which are by no means can be reached in the terrestrial laboratories.

My research is aimed at the solution of a few astrophysical problems of current importance:
  • Physics of X-ray pulsars and magnetars - the strongest magnets ever created by nature. Enormous strength of their magnetic fields (1012-1016 G) exceed values achieved by mankind by 10 orders of magnitude! Specifically, I am investigating observational appearance of such huge magnetic fields in the spectral and timing properties of accreting neutron stars.
  • Nucleosynthesis during supernova explosions is the primary channel of producing elements heavier then iron peak. Production of elements from iron to uranium occurs within seconds in a supernova explosion. Therefore, for to verify the SN explosion models it is of vital importance to measure from observations an ammount of the synthesised heavy elements. My studies are focused on the radioactive decay of 44Ti that can be detected through its emission in the direct-escape lines at energies 67.9, 78.4, and 1157 keV.

Selected publications

  • Revnivtsev M., Tsygankov S., Churazov E., Krivonos R. Hard X-ray emission of Sco X-1 // Monthly Notices of the Royal Astronomical Society, V. 445, p.1205-1212 (2014).
  • Grebenev S., Lutovinov A., Tsygankov S., Winkler C. Hard X-ray emission lines from the decay of Ti-44 in the remnant of Supernova 1987A // Nature, V. 490, pp. 373-375 (2012)
  • Tsygankov S. S., Krivonos R., Lutovinov A. Broadband Observations of the Persistent Be/X-ray Binary Pulsar RX J0440.9+4431: Discovery of a Cyclotron Absorption Line // Monthly Notices of the Royal Astronomical Society, V. 421, pp. 2407-2413 (2012).
  • Tsygankov S. S., Churazov E. M. Search for outbursts in the narrow 511-keV line from compact sources based on INTEGRAL data // Astronomy Letters, V. 36, pp. 237-247 (2010).
  • Tsygankov S. S., Lutovinov A. A., Serber A. V. Completing the puzzle of the 2004-2005 outburst in V0332+53: the brightening phase included // Monthly Notices of the Royal Astronomical Society, V. 401, pp. 1628-1635 (2010).
  • S. Tsygankov, A. Lutovinov, E. Churazov, R. Sunyaev. 4U 0115+63 from RXTE and INTEGRAL Data: Pulse Profile and Cyclotron Line Energy // Astronomy Letters, Vol. 33, No. 6, pp. 368-384 (2007).
  • S. Tsygankov, A. Lutovinov, E. Churazov, R. Sunyaev. V0332+53 in the outburst of 2004-2005: luminosity dependence of the cyclotron line and pulse profile // Monthly Notices of the Royal Astronomical Society, 371, 19 (2006).

Contact information

Sergey Tsygankov, PhD, Docent
Tel (office): +358 2 333 8981
E-mail: sergey.tsygankov [at]
Address: Tuorla Observatory, University of Turku
Väisäläntie 20,
FIN-21500 Piikkiö, Finland

20014 Turun yliopisto, Finland
Tel. +358 29 450 5000

People search

Follow us: 
Facebook   Twitter   Instagram   Youtube   LinkedIn
© University of Turku