English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

IGR J17591$-$2342 is a new accreting millisecond X-ray pulsar (AMXP) that wasrecently discovered in outburst in 2018. Early observations revealed that thesource's radio emission is brighter than that of any other known neutron starlow-mass X-ray binary (NS-LMXB) at comparable X-ray luminosity, and assumingits likely $\gtrsim 6$ kpc distance. It is comparably radio bright to blackhole LMXBs at similar X-ray luminosities. In this work, we present the resultsof our extensive radio and X-ray monitoring campaign of the 2018 outburst ofIGR J17591$-$2342. In total we collected 10 quasi-simultaneous radio (VLA,ATCA) and X-ray (Swift-XRT) observations, which make IGR J17591$-$2342 one ofthe best-sampled NS-LMXBs. We use these to fit a power-law correlation index$\beta = 0.37^{+0.42}_{-0.40}$ between observed radio and X-ray luminosities ($L_\mathrm{R}\propto L_\mathrm{X}^{\beta}$). However, our monitoring revealed alarge scatter in IGR J17591$-$2342's radio luminosity (at a similar X-rayluminosity, $L_\mathrm{X} \sim 10^{36}$ erg s$^{-1}$, and spectral state), with$L_\mathrm{R} \sim 4 \times 10^{29}$ erg s$^{-1}$ during the first threereported observations, and up to a factor of 4 lower $L_\mathrm{R}$ duringlater radio observations. Nonetheless, the average radio luminosity of IGRJ17591$-$2342 is still one of the highest among NS-LMXBs, and we discusspossible reasons for the wide range of radio luminosities observed in suchsystems during outburst. We found no evidence for radio pulsations from IGRJ17591$-$2342 in our Green Bank Telescope observations performed shortly afterthe source returned to quiescence. Nonetheless, we cannot rule out that IGRJ17591$-$2342 becomes a radio millisecond pulsar during quiescence.

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