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- Title
ALMA observations of 4U 1728-34 and 4U 1820-30: first detection of neutron star X-ray binaries at 300 GHz.
- Authors
Trigo, M. Díaz; Migliari, S.; Miller-Jones, J. C. A.; Rahoui, F.; Russell, D. M.; Tudor, V.
- 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.
- Subjects
BINARY stars; NEUTRON stars; ATACAMA Large Millimeter Array (Project); RADIO astrophysics; SPECTRAL energy distribution
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2017, Vol 600, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201629472