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    ALMA observations of 4U 1728 - 34 and 4U 1820 - 30: First detection of neutron star X-ray binaries at 300 GHz

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    Access Status
    Open access
    Authors
    Díaz Trigo, M.
    Migliari, S.
    Miller-Jones, James
    Rahoui, F.
    Russell, D.
    Tudor, V.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Díaz Trigo, M. and Migliari, S. and Miller-Jones, J. and Rahoui, F. and Russell, D. and Tudor, V. 2017. ALMA observations of 4U 1728 - 34 and 4U 1820 - 30: First detection of neutron star X-ray binaries at 300 GHz. Astronomy and Astrophysics. 600: A8.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201629472
    ISSN
    0004-6361
    School
    Department of Physics and Astronomy
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    Reproduced with permission from Astronomy & Astrophysics, © ESO

    URI
    http://hdl.handle.net/20.500.11937/52076
    Collection
    • Curtin Research Publications
    Abstract

    We report on the first observations of neutron star low-mass X-ray binaries with the Atacama Large Millimeter/submillimeter Array (ALMA) at ~300 GHz. Quasi-simultaneous observations of 4U 1728-34 and 4U 1820-30 were performed at radio (ATCA), infrared (VLT) and X-ray (Swift) frequencies, spanning more than eight decades in frequency coverage. Both sources are detected at high significance with ALMA. The spectral energy distribution of 4U 1728-34 is consistent with synchrotron emission from a jet with a break from optically thick to optically thin emission at 1.3-11.0 × 1013 Hz. This is the third time a jet spectral break has been reported for a neutron star X-ray binary. The radio to mm spectral energy distribution of 4U 1820-30 has significant detections at 5 and 300 GHz. This confirms the presence of radio emission during a soft state for this neutron star and represents the first detection of mm emission during such a state, unambiguously pointing to the presence of a jet. We also report on three additional unrelated sources - showing mm emission - in the ALMA fields of view of 4U 1728-34 and 4U 1820-30. © ESO, 2017.

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