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|Title:||Simultaneous X-ray and radio observations of the transitional millisecond pulsar candidate CXOU J110926.4-650224. The discovery of a variable radio counterpart||Authors:||Coti Zelati, F.
Torres, D. F.
DE MARTINO, Domitilla
Buckley, D. A. H.
Russell, T. D.
Van Rooyen, R.
Stappers, B. W.
|Issue Date:||2021||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||655||First Page:||A52||Abstract:||We present the results of simultaneous observations of the transitional millisecond pulsar (tMSP) candidate <ASTROBJ>CXOU J110926.4-650224</ASTROBJ> with the XMM-Newton satellite and the MeerKAT telescope. The source was found at an average X-ray luminosity of L<SUB>X</SUB> ≃ 7 × 10<SUP>33</SUP> erg s<SUP>−1</SUP> over the 0.3−10 keV band (assuming a distance of 4 kpc) and displayed a peculiar variability pattern in the X-ray emission, switching between high, low and flaring modes on timescales of tens of seconds. A radio counterpart was detected at a significance of 7.9σ with an average flux density of ≃33 μJy at 1.28 GHz. It showed variability over the course of hours and emitted a ≃10-min long flare just a few minutes after a brief sequence of multiple X-ray flares. No clear evidence for a significant correlated or anticorrelated variability pattern was found between the X-ray and radio emissions over timescales of tens of minutes and longer. <ASTROBJ>CXOU J110926.4-650224</ASTROBJ> was undetected at higher radio frequencies in subsequent observations performed with the Australia Telescope Compact Array, when the source was still in the same X-ray sub-luminous state observed before, down to a flux density upper limit of 15 μJy at 7.25 GHz (at 3σ). We compare the radio emission properties of <ASTROBJ>CXOU J110926.4-650224</ASTROBJ> with those observed in known and candidate tMSPs and discuss physical scenarios that may account for its persistent and flaring radio emissions.||URI:||http://hdl.handle.net/20.500.12386/32731||URL:||https://www.aanda.org/articles/aa/full_html/2021/11/aa41431-21/aa41431-21.html
|Appears in Collections:||1.01 Articoli in rivista|
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