Constraining Radio Emission from Magnetars

Abstract

We report on radio observations of five magnetars and two magnetar candidates carried out at 1950 MHz with the Green Bank Telescope in 2006-2007. The data from these observations were searched for periodic emission and bright single pulses. Also, monitoring observations of magnetar 4U0142+61 following its 2006 X-ray bursts were obtained. No radio emission was detected was detected for any of our targets. The non-detections allow us to place luminosity upper limits (at 1950 MHz) of approximately L < 1.60 mJy kpc^2 for periodic emission and L < 7.6 Jy kpc^2 for single pulse emission. These are the most stringent limits yet for the magnetars observed. The resulting luminosity upper limits together with previous results are discussed, as is the importance of further radio observations of radio-loud and radio-quiet magnetars.

11 pages, 4 figures

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• Frequency-dependent effects of gravitational lensing within plasma
• PSR J1841-0500: a radio pulsar that mostly is not there
• Radio Non-Detection of the SGR 1806-20 Giant Flare and Implications for Fast Radio Bursts
• X-ray and radio observations of the magnetar SGR J1935+2154 during its 2014, 2015, and 2016 outbursts
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• Repeated, Delayed Torque Variations Following X-ray Flux Enhancements in the Magnetar 1E1048.1$-$5937
• Birth and Evolution of Fast Radio Bursts: Strong Population-Based Evidence for a Neutron-Star Origin
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• New upper limits on low-frequency radio emission from isolated neutron stars with LOFAR
• Non-detection of pulsed radio emission from magnetar Swift J1834.9-0846: constraint on the fundamental plane of magnetar radio emission
• Multimessenger signatures of a deformed magnetar in gamma-ray bursts
• Giant radio pulses in the magnetar XTE J1810-197 detected with the IAR's telescopes
• A month of monitoring the new magnetar Swift J1555.2-5402 during an X-ray outburst