Exploring the case for hard-X-ray beaming in NGC 6946 X-1
In order to understand the nature of super-Eddington accretion we must explore both the emission emerging directly from the inflow and its impact on the surroundings. In this paper, we test whether we can use the optical line emission of spatially resolved, ionized nebulae around ultraluminous X-ray...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Published: |
2024
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| Online Access: | http://purl.org/au-research/grants/arc/DP200102471 http://hdl.handle.net/20.500.11937/97225 |
| _version_ | 1848766241917894656 |
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| author | Beuchert, T. Middleton, M.J. Soria, R. Miller-Jones, James Dauser, T. Roberts, T.P. Sathyaprakash, R. Markoff, S. |
| author_facet | Beuchert, T. Middleton, M.J. Soria, R. Miller-Jones, James Dauser, T. Roberts, T.P. Sathyaprakash, R. Markoff, S. |
| author_sort | Beuchert, T. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In order to understand the nature of super-Eddington accretion we must explore both the emission emerging directly from the inflow and its impact on the surroundings. In this paper, we test whether we can use the optical line emission of spatially resolved, ionized nebulae around ultraluminous X-ray sources (ULXs) as a proxy for their X-ray luminosity. We choose the ULX NGC 6946 X-1 and its nebula, MF16, as a test case. By studying how the nebular optical line emission responds to assumed irradiation, we can infer the degree to which we require the UV or X-ray emission from the inflow to be collimated by optically thick winds seemingly ubiquitously associated with ULXs. We find that the nebula is highly sensitive to compact UV emission but mostly insensitive to hard X-rays. Our attempts to quantify the beaming of the soft and hard X-rays therefore strongly depends on the UV luminosity of the ULX in the centre of the nebula. We find that it is not possible to conclude a lack of geometrical beaming of hard X-rays from such sources via nebula feedback. |
| first_indexed | 2025-11-14T11:48:01Z |
| format | Journal Article |
| id | curtin-20.500.11937-97225 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:48:01Z |
| publishDate | 2024 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-972252025-04-30T01:39:49Z Exploring the case for hard-X-ray beaming in NGC 6946 X-1 Beuchert, T. Middleton, M.J. Soria, R. Miller-Jones, James Dauser, T. Roberts, T.P. Sathyaprakash, R. Markoff, S. In order to understand the nature of super-Eddington accretion we must explore both the emission emerging directly from the inflow and its impact on the surroundings. In this paper, we test whether we can use the optical line emission of spatially resolved, ionized nebulae around ultraluminous X-ray sources (ULXs) as a proxy for their X-ray luminosity. We choose the ULX NGC 6946 X-1 and its nebula, MF16, as a test case. By studying how the nebular optical line emission responds to assumed irradiation, we can infer the degree to which we require the UV or X-ray emission from the inflow to be collimated by optically thick winds seemingly ubiquitously associated with ULXs. We find that the nebula is highly sensitive to compact UV emission but mostly insensitive to hard X-rays. Our attempts to quantify the beaming of the soft and hard X-rays therefore strongly depends on the UV luminosity of the ULX in the centre of the nebula. We find that it is not possible to conclude a lack of geometrical beaming of hard X-rays from such sources via nebula feedback. 2024 Journal Article http://hdl.handle.net/20.500.11937/97225 10.1093/mnras/stae1975 http://purl.org/au-research/grants/arc/DP200102471 fulltext |
| spellingShingle | Beuchert, T. Middleton, M.J. Soria, R. Miller-Jones, James Dauser, T. Roberts, T.P. Sathyaprakash, R. Markoff, S. Exploring the case for hard-X-ray beaming in NGC 6946 X-1 |
| title | Exploring the case for hard-X-ray beaming in NGC 6946 X-1 |
| title_full | Exploring the case for hard-X-ray beaming in NGC 6946 X-1 |
| title_fullStr | Exploring the case for hard-X-ray beaming in NGC 6946 X-1 |
| title_full_unstemmed | Exploring the case for hard-X-ray beaming in NGC 6946 X-1 |
| title_short | Exploring the case for hard-X-ray beaming in NGC 6946 X-1 |
| title_sort | exploring the case for hard-x-ray beaming in ngc 6946 x-1 |
| url | http://purl.org/au-research/grants/arc/DP200102471 http://hdl.handle.net/20.500.11937/97225 |