Accretion disk parameters in HLX-1
We estimate the outer radius of the accretion disk in HLX-1 from its optical brightness and from the exponential timescale of the decline in the X-ray lightcurve after an outburst. We find that the disk is an order of magnitude smaller than the semimajor axis of the orbit. If the disk size is determ...
| Main Authors: | , |
|---|---|
| Format: | Conference Paper |
| Published: |
2012
|
| Online Access: | http://hdl.handle.net/20.500.11937/15678 |
| _version_ | 1848748958684282880 |
|---|---|
| author | Soria, Roberto Hau, G. |
| author_facet | Soria, Roberto Hau, G. |
| author_sort | Soria, Roberto |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We estimate the outer radius of the accretion disk in HLX-1 from its optical brightness and from the exponential timescale of the decline in the X-ray lightcurve after an outburst. We find that the disk is an order of magnitude smaller than the semimajor axis of the orbit. If the disk size is determined by the circularization radius near periastron, the eccentricity of the binary system must be ? 0.95. We report on the discovery of Ha emission during the 2012 outburst, with a single-peaked, narrow profile (consistent with a nearly face-on view), and a central velocity displaced by ˜ 490 km s-1 from that of the host galaxy. © International Astronomical Union 2013. |
| first_indexed | 2025-11-14T07:13:19Z |
| format | Conference Paper |
| id | curtin-20.500.11937-15678 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:13:19Z |
| publishDate | 2012 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-156782018-03-29T09:07:32Z Accretion disk parameters in HLX-1 Soria, Roberto Hau, G. We estimate the outer radius of the accretion disk in HLX-1 from its optical brightness and from the exponential timescale of the decline in the X-ray lightcurve after an outburst. We find that the disk is an order of magnitude smaller than the semimajor axis of the orbit. If the disk size is determined by the circularization radius near periastron, the eccentricity of the binary system must be ? 0.95. We report on the discovery of Ha emission during the 2012 outburst, with a single-peaked, narrow profile (consistent with a nearly face-on view), and a central velocity displaced by ˜ 490 km s-1 from that of the host galaxy. © International Astronomical Union 2013. 2012 Conference Paper http://hdl.handle.net/20.500.11937/15678 10.1017/S1743921312019254 restricted |
| spellingShingle | Soria, Roberto Hau, G. Accretion disk parameters in HLX-1 |
| title | Accretion disk parameters in HLX-1 |
| title_full | Accretion disk parameters in HLX-1 |
| title_fullStr | Accretion disk parameters in HLX-1 |
| title_full_unstemmed | Accretion disk parameters in HLX-1 |
| title_short | Accretion disk parameters in HLX-1 |
| title_sort | accretion disk parameters in hlx-1 |
| url | http://hdl.handle.net/20.500.11937/15678 |