Maan, Yogesh and Joshi, Bhal Chandra and Surnis, Mayuresh P. and Bagchi, Manjari and Manoharan, P. K. (2019) Distinct Properties of the Radio Burst Emission from the Magnetar XTE J1810–197. The Astrophysical Journal, 882 (1). L9. ISSN 2041-8213
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Abstract
XTE J1810−197 (PSR J1809-1943) was the first magnetar that was found to emit transient radio emission. It has recently undergone another radio and high-energy outburst. This is only the second radio outburst that has been observed from this source. We observed J1810−197 soon after its recent radio outburst at low radio frequencies using the Giant Metrewave Radio Telescope. We 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. The magnetar also exhibits radio emission in the form of strong, narrow bursts. We show that the bursts have a characteristic intrinsic width of the order of 0.5–0.7 ms, and discuss their properties in the context of giant pulses and giant micropulses from other pulsars. We also show that the bursts exhibit spectral structures that cannot be explained by interstellar propagation effects. These structures might indicate a phenomenological link with the repeating fast radio bursts that also show interesting, more detailed frequency structures. While the spectral structures are particularly noticeable in the early phases of the outburst, these seem to be less prominent as well as less frequent in the later phases, suggesting an evolution of the underlying cause of these spectral structures.
Item Type: | Article |
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Subjects: | Science Global Plos > Physics and Astronomy |
Depositing User: | Unnamed user with email support@science.globalplos.com |
Date Deposited: | 31 May 2023 07:29 |
Last Modified: | 15 Jan 2024 04:29 |
URI: | http://ebooks.manu2sent.com/id/eprint/989 |