VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence
We present time-resolved optical spectroscopy of the counterpart to the high-inclination black hole low-mass X-ray binary Swift J1357.2−0933 in quiescence. Absorption features from the mass donor star were not detected. Instead the spectra display prominent broad double-peaked H α emission and weake...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2015
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| Online Access: | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/4860 |
| _version_ | 1848744634904215552 |
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| author | Torres, M. Jonker, P. Miller-Jones, James Steeghs, D. Repetto, S. Wu, J. |
| author_facet | Torres, M. Jonker, P. Miller-Jones, James Steeghs, D. Repetto, S. Wu, J. |
| author_sort | Torres, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present time-resolved optical spectroscopy of the counterpart to the high-inclination black hole low-mass X-ray binary Swift J1357.2−0933 in quiescence. Absorption features from the mass donor star were not detected. Instead the spectra display prominent broad double-peaked H α emission and weaker He i emission lines. From the H α peak-to-peak separation, we constrain the radial velocity semi-amplitude of the donor star to K2 > 789 km s−1. Further analysis through radial velocity and equivalent width measurements indicates that the H α line is free of variability due to S-wave components or disc eclipses. From our data and previous observations during outburst, we conclude that long-term radial velocity changes ascribed to a precessing disc were of low amplitude or not present. This implies that the centroid position of the line should closely represent the systemic radial velocity, γ. Using the derived γ = −150 km s−1 and the best available limits on the source distance, we infer that the black hole is moving towards the plane in its current Galactic orbit unless the proper motion is substantial. Finally, the depth of the central absorption in the double-peaked profiles adds support for Swift J1357.2−0933 as a high-inclination system. On the other hand, we argue that the low hydrogen column density inferred from X-ray fitting suggests that the system is not seen edge-on. |
| first_indexed | 2025-11-14T06:04:35Z |
| format | Journal Article |
| id | curtin-20.500.11937-4860 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:04:35Z |
| publishDate | 2015 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-48602022-11-23T06:40:49Z VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence Torres, M. Jonker, P. Miller-Jones, James Steeghs, D. Repetto, S. Wu, J. We present time-resolved optical spectroscopy of the counterpart to the high-inclination black hole low-mass X-ray binary Swift J1357.2−0933 in quiescence. Absorption features from the mass donor star were not detected. Instead the spectra display prominent broad double-peaked H α emission and weaker He i emission lines. From the H α peak-to-peak separation, we constrain the radial velocity semi-amplitude of the donor star to K2 > 789 km s−1. Further analysis through radial velocity and equivalent width measurements indicates that the H α line is free of variability due to S-wave components or disc eclipses. From our data and previous observations during outburst, we conclude that long-term radial velocity changes ascribed to a precessing disc were of low amplitude or not present. This implies that the centroid position of the line should closely represent the systemic radial velocity, γ. Using the derived γ = −150 km s−1 and the best available limits on the source distance, we infer that the black hole is moving towards the plane in its current Galactic orbit unless the proper motion is substantial. Finally, the depth of the central absorption in the double-peaked profiles adds support for Swift J1357.2−0933 as a high-inclination system. On the other hand, we argue that the low hydrogen column density inferred from X-ray fitting suggests that the system is not seen edge-on. 2015 Journal Article http://hdl.handle.net/20.500.11937/4860 10.1093/mnras/stv720 http://purl.org/au-research/grants/arc/FT140101082 Oxford University Press fulltext |
| spellingShingle | Torres, M. Jonker, P. Miller-Jones, James Steeghs, D. Repetto, S. Wu, J. VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence |
| title | VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence |
| title_full | VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence |
| title_fullStr | VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence |
| title_full_unstemmed | VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence |
| title_short | VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence |
| title_sort | vlt spectroscopy of the black hole candidate swift j1357.2-0933 in quiescence |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/4860 |