SIMBAD references

2020MNRAS.492.1091G - Mon. Not. R. Astron. Soc., 492, 1091-1101 (2020/February-2)

Radio and X-ray monitoring of the accreting millisecond X-ray pulsar IGR J17591-2342 in outburst.

GUSINSKAIA N.V., RUSSELL T.D., HESSELS J.W.T., BOGDANOV S., DEGENAAR N., DELLER A.T., VAN DEN EIJNDEN J., JAODAND A.D., MILLER-JONES J.C.A. and WIJNANDS R.

Abstract (from CDS):

IGR J17591-2342 is a new accreting millisecond X-ray pulsar that was recently discovered in outburst in 2018. Early observations revealed that the source's radio emission is brighter than that of any other known neutron star low-mass X-ray binary (NS-LMXB) at comparable X-ray luminosity, and assuming its likely >=6 kpc distance. It is comparably radio bright to black hole LMXBs at similar X-ray luminosities. In this work, we present the results of our extensive radio and X-ray monitoring campaign of the 2018 outburst of IGR J17591-2342. In total, we collected 10 quasi-simultaneous radio (VLA, ATCA) and X-ray (Swift-XRT) observations, which make IGR J17591-2342 one of the best-sampled NS-LMXBs. We use these to fit a power-law correlation index β = 0.37^{+0.42}_{-0.40} between observed radio and X-ray luminosities (LR ∝ LXβ). However, our monitoring revealed a large scatter in IGR J17591-2342's radio luminosity (at a similar X-ray luminosity, LX ∼1036 erg s-1, and spectral state), with LR ∼ 4 x 1029 erg s-1 during the first three reported observations, and up to a factor of 4 lower LR during later radio observations. None the less, the average radio luminosity of IGR J17591-2342 is still one of the highest among NS-LMXBs, and we discuss possible reasons for the wide range of radio luminosities observed in such systems during outburst. We found no evidence for radio pulsations from IGR J17591-2342 in our Green Bank Telescope observations performed shortly after the source returned to quiescence. None the less, we cannot rule out that IGR J17591-2342 becomes a radio millisecond pulsar during quiescence.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: neutron - X-rays: binaries

Simbad objects: 19

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2021.06.25-16:30:30

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