Radio Pulsation Search and Imaging Study of SGR J1935+2154

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.

20 pages, 4 figures. Accepted for publication in ApJ

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Cited by in corpus (17)

• Implications of a "Fast Radio Burst" from a Galactic Magnetar
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• Radio continuum and polarization study of SNR G57.2+0.8 associated with magnetar SGR1935+2154
• Revisiting the distance, environment and supernova properties of SNR G57.2+0.8 that hosts SGR 1935+2154
• On the Distance of SGR 1935+2154 Associated with FRB 200428 and Hosted in SNR G57.2+0.8
• No redshift evolution of non-repeating fast radio-burst rates
• A Magnetar-Asteroid Impact Model for FRB 200428 Associated with an X-ray Burst from SGR 1935+2154
• Distinct properties of the radio burst emission from the magnetar XTE J1810-197
• Multi-frequency observations of SGR J1935+2154
• A Complete Catalogue of Dusty Supernova Remnants
• PSR J1119-6127 and its pulsar wind nebula following the magnetar-like bursts
• Limits on Simultaneous and Delayed Optical Emission from Well-localized Fast Radio Bursts
• Identification of the infrared counterpart of SGR 1935+2154 with the Hubble Space Telescope
• Similarity to earthquakes again: periodic radio pulses of the magnetar SGR 1935+2154 are accompanied by aftershocks like fast radio bursts
• Constraining the X-ray - Infrared spectral index of second-timescale flares from SGR1935+2154 with Palomar Gattini-IR
• A search using GEO600 for gravitational waves coincident with fast radio bursts from SGR 1935+2154
• The Fast Radio Burst-emitting magnetar SGR 1935+2154 -- proper motion and variability from long-term Hubble Space Telescope monitoring