Radio Pulsation Search and Imaging Study of SGR J1935+2154
TLDR
In this paper, the authors presented the results obtained from imaging observations, and search for radio pulsations towards the magnetar SGR J1935+2154 made using the Giant Metrewave Radio Telescope, and the Ooty Radio Telescope.Abstract:
We present the results obtained from imaging observations, and search for radio pulsations towards the magnetar SGR J1935+2154 made using the Giant Metrewave Radio Telescope, and the Ooty Radio Telescope. We present the high resolution radio image of the supernova remnant (SNR) G57.2+0.8, which is positionally associated with SGR J1935+2154. We did not detect significant periodic radio pulsations from the magnetar, with 8$\sigma$ upper limits on its flux density of 0.4, and 0.2 mJy at 326.5, and 610 MHz, respectively, for an assumed duty cycle of 10\%. The corresponding 6$\sigma$ upper limits at the two frequencies for any burst emission with an assumed width of 10 ms are 0.5 Jy, and 63 mJy, respectively. No continuum radio point source was detected at the position of SGR J1935+2154 with a 3$\sigma$ upper limit of 1.2 mJy. We also did not detect significant diffuse radio emission in a radius of 70 arc seconds in coincidence with the diffuse X-ray emission reported recently, with a 3$\sigma$ upper limit of 4.5 mJy. Using the archival HI spectra, we estimate the distance of SNR G57.2+0.8 to be 11.7 $\pm$ 2.8 kpc. Based on measured HI column density (N$_H$) along this line of sight, we argue that the magnetar could be physically associated with SNR G57.2+0.8. Based on present data, we can not rule out either a pulsar wind nebula or a dust scattering halo origin for the diffuse X-ray emission seen around the magnetar.read more
Citations
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A unified picture of Galactic and cosmological fast radio bursts
Wenbin Lu,Pawan Kumar,Bing Zhang +2 more
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Radio continuum and polarization study of SNR G57.2+0.8 associated with magnetar SGR1935+2154
TL;DR: In this article, a radio continuum and linear polarization study of the Galactic supernova remnant G57.2+0.8 is presented, which may host the recently discovered magnetar SGR1935+2154.
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Implications of a "Fast Radio Burst" from a Galactic Magnetar
TL;DR: In this article, the authors show that the properties of the coincident radio and X-ray flares from SGR 1935+2154, including their approximate simultaneity and relative fluence, as well as the duration and spectrum of the Xray emission, are consistent with existing predictions for the synchrotron maser shock model.
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Distinct Properties of the Radio Burst Emission from the Magnetar XTE J1810–197
TL;DR: In this article, the authors present the 650 MHz flux density evolution of the source in the early phases of the outburst, and its radio spectrum down to frequencies as low as 300 MHz, and discuss their properties in the context of giant pulses and giant micropulses from other pulsars.
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X-ray and radio observations of the magnetar SGR J1935+2154 during its 2014, 2015, and 2016 outbursts
George Younes,Chryssa Kouveliotou,Amruta Jaodand,Amruta Jaodand,Matthew G. Baring,Alexander J. van der Horst,Alice K. Harding,Jason W. T. Hessels,Jason W. T. Hessels,Neil Gehrels,Ramandeep Gill,Daniela Huppenkothen,Jonathan Granot,Ersin Gogus,Lin Lin +14 more
TL;DR: In this paper, the authors analyzed broad-band X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts.
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