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

M. Díaz Trigo, S. Migliari, J. C.A. Miller-Jones, F. Rahoui, D. M. Russell, V. Tudor

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Article numberA8
JournalAstronomy and Astrophysics
Volume600
DOIs
StatePublished - Apr 1 2017

Keywords

  • ISM: jets and outflows
  • X-rays: binaries
  • accretion, accretion disks
  • stars: individual: 4U 1728-34
  • stars: individual: 4U 1820-30

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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