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Subsecond periodic radio oscillations in a microquasar.

Pengfu Tian1,2, Ping Zhang1,2, Wei Wang3,4

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Astronomers detected new 5-Hz periodic oscillations in the microquasar GRS 1915+105, revealing transient features in its relativistic jet. These findings offer insights into the dynamics of accreting black hole systems.

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Area of Science:

  • Astrophysics
  • High-energy astrophysics
  • Black hole physics

Background:

  • Accreting black holes, such as microquasars, commonly exhibit powerful relativistic jets.
  • GRS 1915+105 is a known black-hole X-ray binary with a relativistic jet, displaying persistent X-ray activity and various quasiperiodic oscillations.

Purpose of the Study:

  • To report the detection of transient periodic oscillation features in the radio emission of the microquasar GRS 1915+105.
  • To investigate the nature and origin of these newly observed oscillations and their relationship to the relativistic jet.

Main Methods:

  • Analysis of radio observations from January 2021 and June 2022 in the 1.05- to 1.45-GHz band.
  • Detection and characterization of transient periodic oscillation features.
  • Observation of circular polarization during the oscillation phases.

Main Results:

  • Two instances of approximately 5-Hz transient periodic oscillation features were detected in the radio band.
  • These oscillations occurred in January 2021 and June 2022.
  • Circular polarization was observed concurrently with these oscillations.

Conclusions:

  • The detected 5-Hz oscillations provide new observational constraints on the physical processes occurring near the black hole and within the relativistic jet.
  • The presence of circular polarization may offer clues about the magnetic field geometry and particle acceleration mechanisms in the jet.
  • Further studies are needed to fully understand the origin and implications of these transient phenomena in GRS 1915+105.