NDLI: Observations of radio emission from the cosmic gamma-ray burst GRB 030329

Content Provider	Springer Nature Link
Author	Finkelstein, A. M. Ipatov, A. V. Gnedin, Yu. N. Ivav, D. V. Khariv, M. A. Rakhimov, I. A.
Copyright Year	2004
Abstract	We present the radio observations of the afterglow from the intense cosmic gamma-ray burst GRB 030329 performed with the radio telescopes of the Institute of Applied Astronomy, Russian Academy of Sciences, at the Svetloe (λ=3.5 cm) and Zelenchuk (λ=6 cm) Observatories. The difference between the fluxes measured in two different polarization modes suggests the existence of a circular polarization in the radio afterglow from GRB 030329. However, since the measurement errors of the fluxes with different circular polarizations are large, we cannot draw a firm conclusion about its detection; we can only set an upper limit on its value. An analysis of the possible generation mechanisms for the circular polarization of the relativistic jet suggests that there is a helical magnetic field in the jet. The existence of significant flux densities at various wavelengths during a long (≥10 days) period leads us to conclude that the hydrodynamic evolution of the relativistic bow shock takes place in the stellar wind, not in the interstellar medium. We have estimated the total GRB energy (E=10$^{51}$ erg) (under the assumption of isotropic radiation) and the plasma density of the stellar wind from the presupernova (n=3 cm$^{−3}$). The magnetic-field strength in the relativistic jet can be estimated as B≈100 G.
Starting Page	368
Ending Page	375
Page Count	8
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	30
Issue Number	6
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2004-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	radio astronomy cosmic gamma-ray bursts polarization Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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