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Invited researcher Juri Poutanen
Contract number
14.W03.31.0021
Time span of the project
2018-2020

As of 30.01.2020

24
Number of staff members
35
scientific publications
General information

Name of the project: Development of prospective X-ray radiation detection systems for solving fundamental and applied problems of space research

Strategy for Scientific and Technological Development Priority Level: е


Goals and objectives

Research directions: Space sciences

Project objective: Research of X-ray space objects – neutron stars – to solve fundamental problems of modern physics and astrophysics, relevant applied problems of exploration of the space by creating and developing theoretical models, methods and algorithms for processing of experimental data as well as for creation of prospective X-ray radiation detection systems.


The practical value of the study

  • We have enhanced a method of modeling atmospheres of neutron stars heated by streams of fast ions. The model gives an opportunity to increase precision of measurements of masses and radii of neutron stars.
  • We have enhanced a method of modeling spectrums of radiation of fast-spinning neutron stars. We have modified a method of determining fundamental parameters of neutron stars by spectral evolution of thermonuclear flashes at their surfaces at the glow decreases stage. A new method has been developed for direct approximation of obtained spectrums with models of neutron star atmospheres and a procedure for interpolation of model spectrums.
  • A method for analysis of fast variability of X-ray pulsars has been proposed and tested. The technique allows to use qualities of ensembles of pulses and to determine the phases in which nonstochastic variability is observed.
  • A software package has developed for complex simultaneous analysis of shared characteristics (cross-correlations, power spectrums, coherence, temporal delays) from data coming from several X-ray channels.
  • Several dozens of pulsars have been selected that can be observed in the X-ray part of the electromagnetic spectrum. Using data from the NICER observatory we have conducted analysis of eight «candidates» that are optimally suited for usage as reference sources for X-ray navigation systems.
  • Requirements on X-ray detectors for research of neutron stars and navigation using X-ray pulsars have been formulated. Main parameters of such sensors have been determined.
  • Our researchers formulated and investigated feasibility of requirements on thermal regime systems of X-ray detectors designed for researching neutron stars and navigation systems using X-ray pulsars installed on spacecraft functioning in Low Earth Orbit and highly elliptical orbits.
  • A topology of main IP blocks for an application-specific integrated circuit (ASIC) comprising the spectrometric route of a future X-ray detector. We have optimized the topology of IP blocks and assembled them into a single SDDASIC3 circuit. Compliance of the topology with rules of design has been checked and a project of the ASIC has been prepared for production.
  • A draft of the structure of an X-ray radiation detector based on a matrix of silicon drift detectors has been developed. It uses the developed ASIC and is aimed at solving fundamental and applied problems of astrophysics

Collaborations:

University of Tübingen (Germany), Leiden University (the Netherlands), University of Turku (Finland), International Space Science Institute (Switzerland), Stockholm University (Sweden), Xiangtan University (China PR): joint research.

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Suleimanov V.F., Poutanen J., Werner K.
Accretion Heated Atmospheres of X-ray Bursting Neutron Stars. Astronomy and Astrophysics 619: A114 (2018).
Salmi T., Nättilä J., Poutanen J.
Bayesian Parameter Constraints for Neutron Star Masses and Radii Using X-ray Timing Observations of Accretion-Powered Millisecond Pulsars. Astronomy and Astrophysics 618: A161 (2018).
Veledina A.
Interplay of Spectral Components in Timing Properties of Accreting Compact Objects. Monthly Notices of the Royal Astronomical Society 481(3): 4236–4249 (2018).
Igoshev A.P., Tsygankov S.S., Rigoselli M., Mereghetti S., Popov S.B., Elfritz J.G., Mushtukov A.A.
Discovery of X-rays from the Old and Faint Pulsar J1154—6250. The Astrophysical Journal 865(2): 116 (2018).
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