Distinct properties of the radio burst emission from the magnetar XTE J1810-197. (arXiv:1908.04304v1 [astro-ph.HE])

Distinct properties of the radio burst emission from the magnetar XTE J1810-197. (arXiv:1908.04304v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Maan_Y/0/1/0/all/0/1">Yogesh Maan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Joshi_B/0/1/0/all/0/1">Bhal Chandra Joshi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Surnis_M/0/1/0/all/0/1">Mayuresh P. Surnis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bagchi_M/0/1/0/all/0/1">Manjari Bagchi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Manoharan_P/0/1/0/all/0/1">P. K. Manoharan</a>

XTE J1810-197 was the first ever magnetar which 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
which cannot be explained by interstellar propagation effects. These structures
might indicate a phenomenological link with the repeating fast radio bursts
which 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.

XTE J1810-197 was the first ever magnetar which 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
which cannot be explained by interstellar propagation effects. These structures
might indicate a phenomenological link with the repeating fast radio bursts
which 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.

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