Low-frequency constraints on the spectra of the lobes of the microquasar GRS 1758-258

Abstract

I present low-frequency observations of the lobes of the microquasar GRS 1758-258, which, together with earlier radio observations, provide the best constraints yet on the lobe spectra, and show that they are consistent with the electron energy indices expected from standard shock acceleration models. There is no statistically significant evidence for synchrotron ageing along the length of the lobes, which is consistent with expectation if the magnetic field strength is close to the minimum-energy value. If the environment of the lobes has typical ISM properties, the lobes will dissipate on timescales of thousands of years or less, long before synchrotron ageing can become significant.

5 pages, accepted by A&A

References in corpus (4)

• Magnetic field strengths in the hotspots and lobes of three powerful FRII radio sources
• X-ray emission from the nuclei, lobes and hot-gas environments of two FR-II radio galaxies
• The Infrared Counterpart of the Microquasar GRS 1758-258
• Chandra High Resolution Camera Imaging of GRS 1758-258

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• Radio and X-ray Properties of Relativistic Beaming Models for Ultra-Luminous X-ray Sources
• Accretion states of the Galactic microquasar GRS 1758-258
• Jet-ISM Interactions near the Microquasars GRS 1758-258 and 1E 1740.7-2942
• Multi-band study of NGC 7424 and its two newly-discovered ULXs
• The non-thermal emission of extended radio galaxy lobes with curved electron spectra
• Astrophysics in 2005
• Effects of precession versus instabilities on the jets of GRS 1758-258