RATAN-600 multi-frequency measurements of the magnetar XTE J1810-197
ATel #12372; S. A. Trushkin, N. N. Bursov, P. G. Tsybulev, N. A. Nizhelskij, A. Erkenov (SAO RAS, Russia)
on 9 Jan 2019; 19:14 UT
Credential Certification: Sergei Trushkin (satr@sao.ru)
Subjects: Radio, X-ray, Pulsar, Magnetar
We have observed the magnetar XTE J1810-197 (ATel #12285, #12288, #12312, #12323 and #12353) from 19 December 2018 to 9 January 2019 almost daily at 2.3, 4.7, 8.3 and 11.7 GHz with the RATAN-600 radio telescope, following up of the new flare of the XTE J1810-197 after 10 years of silence (Lyne et al., ATel #12284). Sometimes we have detected the single pulsations at all frequency with the high signal to noise ratio, but they are not the same, because we observe the cosmic sources as a rule in the transit mode, when the beams of the receivers on the sky are shifted within 40 seconds of Right Ascension. The average spectral index of the total flux density was near -1.5 (for example, on 22 and 23 December 2018). Using of the digitized with the interval 7.8 ms data we have detected the bright variable multi-peak substructure of the single pulsations at the most sensitive receiver at 4.7 GHz with bandwidth 600 MHz, where fluxes of the local maxima reached 1-6 Jy and the total widths of single pulsations were near 150-200 ms or 3-4% of the pulsar period of 5.5414s. This substructure and peak fluxes have strongly changed from pulsation to pulsation when we have used the 'sliding' mode to collect 25 consistent pulses during 135 seconds daily in 2019. We will continue daily observations.
Example of average pulsation for 16 consistent pulses on 09 January (MJD 58492.4) at 4.7 GHz
