Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 487, Issue 3, Pages 4355-4371Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz1548
Keywords
accretion; accretion discs; stars: neutron; pulsars: individual: Swift 70243.6+6124-X-rays: binaries.
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Funding
- Netherlands Organization for Scientific Research (NWO)
- Veni grant from the NWO
- NSERC Discovery Grant
- National Science Foundation (NSF) [AST-1515927]
- NSF [AST-0908816]
- Center for Cosmology and AstroParticle Physics at the Ohio State University
- Mt. Cuba Astronomical Foundation
- George Skestos
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Accretion at super-Eddington rates is expected to be accompanied by strong outflows. Such outflows are observed in Galactic X-ray binaries and extragalactic ultraluminous X-ray sources (ULXs), However, due to their large source distances, ULX outflows are challenging to detect and study in detail, Galactic neutron stars accreting from a Be -star companion at superEddington rates show many similarities to ULX pulsars, and therefore offer an alternative approach to study outflows in this accretion regime, Here, we present Chandra high -resolution spectroscopy of such a super-Eddington accreting neutron star, Swift J0243.6+6124, to search for wind outflow signatures during the peak of its 2017/2018 giant outburst. We detect narrow emission features at rest from Ne, Mg, S, Si, and Fe, In addition, we detect a collection of absorption features which can be identified in two ways: either as all Fe transitions at rest (with a possible contribution from Mg), or a combination of three blue -shifted Ne and Mg lines at -0.22c, while the remaining lines are at rest. The second scenario would imply an outflow with a velocity similar to those seen in ULXs, including the ULX pulsar NGC 300 ULX-1. This result would also imply that Swift J0243.6+6124 launches both a jet, detected in radio and reported previously, and an ultrafast wind outflow simultaneously at super-Eddington accretion rates.
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