CONSTRAINING RADIO EMISSION FROM MAGNETARS.

Authors :: Lazarus, P.
Kaspi, V. M.
Champion, D. J.
Hessels, J. W. T.
Dib, R.
Source :: Astrophysical Journal; Jan2012, Vol. 744 Issue 2, Special section p1-9, 9p
Publication Year :: 2012
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 4U 0142+61 following its 2006 X-ray bursts were obtained. No radio emission was detected for any of our targets. The non-detections allow us to place luminosity upper limits of L<subscript>1950</subscript> ≲ 1.60 mJy kpc² for periodic emission and L<subscript>1950</subscript>, <subscript>single</subscript> ≲ 7.6 Jy kpc² 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. [ABSTRACT FROM AUTHOR]