Transient radio emission from SAX J1808.4-3658

B. M. Gaensler, B. W. Stappers, T. J. Getts

    Research output: Contribution to journalArticlepeer-review


    We report on the detection of radio emission from the accretion-powered X-ray millisecond pulsar SAX J1808.4-3658, using the Australia Telescope Compact Array. We detected an ̃0.8 mJy source at the position of SAX J1808.4-3658 on 1998 April 27, approximately 1 day after the onset of a rapid decline in the X-ray flux; no such source was seen on the previous day. We consider this emission to be related to the radio emission from other X-ray binaries, and it is most likely associated with an ejection of material from the system. No radio emission was detected at later epochs, indicating that if SAX J1808.4-3658 is a radio pulsar during X-ray quiescence, then its monochromatic luminosity must be less than LL4 GHz ̃ 6 mJy kpc2.
    Original languageEnglish
    Pages (from-to)L117-L119
    JournalAstrophysical Journal
    Issue number2
    Publication statusPublished - 10 Sept 1999


    • Accretion
    • Accretion disks
    • Binaries: Close
    • Pulsars: Individual (SAX J1808.4-3658)
    • Radio continuum: Stars
    • Stars: Neutron


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