| Title: |
LMC X-1: A New Spectral Analysis of the O-star in the Binary and Surrounding Nebula. |
| Authors: |
E. A. Hyde1 e.hyde@westernsydney.edu.au, D. M. Russell2, A. Ritter3, M. D. Filipović1, L. Kaper4, K. Grieve1, A. N. O’Brien1,5 |
| Source: |
Publications of the Astronomical Society of the Pacific. Sep2017, Vol. 129 Issue 979, p1-1. 1p. |
| Subject Terms: |
*NEBULAE, *SOLAR radio emission, *SYNCHROTRONS |
| Abstract: |
We provide new observations of the LMC X–1 O star and its extended nebula structure using spectroscopic data from VLT/UVES as well as Hα imaging from the Wide Field Imager on the Max Planck Gesellschaft/European Southern Observatory 2.2 m telescope and ATCA imaging of the 2.1 GHz radio continuum. This nebula is one of the few known to be energized by an X-ray binary. We use a new spectrum extraction technique that is superior to other methods used to obtain both radial velocities and fluxes. This provides an updated spatial velocity of km s−1 for the O star. The slit encompasses both the photo-ionized and shock-ionized regions of the nebula. The imaging shows a clear arc-like structure reminiscent of a wind bow shock in between the ionization cone and shock-ionized nebula. The observed structure can be fit well by the parabolic shape of a wind bow shock. If an interpretation of a wind bow shock system is valid, we investigate the N159-O1 star cluster as a potential parent of the system, suggesting a progenitor mass of ∼60 M⊙ for the black hole. We further note that the radio emission could be non-thermal emission from the wind bow shock, or synchrotron emission associated with the jet-inflated nebula. For both wind- and jet-powered origins, this would represent one of the first radio detections of such a structure. [ABSTRACT FROM AUTHOR] |
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