Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1
<jats:title>ABSTRACT</jats:title> <jats:p>Most ultraluminous X-ray sources (ULXs) are believed to be stellar mass black holes or neutron stars accreting beyond the Eddington limit. Determining the nature of the compact object and the accretion mode from broad-band s...
| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Oxford University Press (OUP)
2022
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| Online Access: | https://hdl.handle.net/1721.1/141981 |
| _version_ | 1811072680177172480 |
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| author | Alston, WN Pinto, C Barret, D D’Aì, A Del Santo, M Earnshaw, H Fabian, AC Fuerst, F Kara, E Kosec, P Middleton, MJ Parker, ML Pintore, F Robba, A Roberts, TP Sathyaprakash, R Walton, D Ambrosi, E |
| author_facet | Alston, WN Pinto, C Barret, D D’Aì, A Del Santo, M Earnshaw, H Fabian, AC Fuerst, F Kara, E Kosec, P Middleton, MJ Parker, ML Pintore, F Robba, A Roberts, TP Sathyaprakash, R Walton, D Ambrosi, E |
| author_sort | Alston, WN |
| collection | MIT |
| description | <jats:title>ABSTRACT</jats:title>
<jats:p>Most ultraluminous X-ray sources (ULXs) are believed to be stellar mass black holes or neutron stars accreting beyond the Eddington limit. Determining the nature of the compact object and the accretion mode from broad-band spectroscopy is currently a challenge, but the observed timing properties provide insight into the compact object and details of the geometry and accretion processes. Here, we report a timing analysis for an 800 ks XMM–Newton campaign on the supersoft ultraluminous X-ray source, NGC 247 ULX-1. Deep and frequent dips occur in the X-ray light curve, with the amplitude increasing with increasing energy band. Power spectra and coherence analysis reveals the dipping preferentially occurs on ∼5 and ∼10 ks time-scales. The dips can be caused by either the occultation of the central X-ray source by an optically thick structure, such as warping of the accretion disc, or from obscuration by a wind launched from the accretion disc, or both. This behaviour supports the idea that supersoft ULXs are viewed close to edge-on to the accretion disc.</jats:p> |
| first_indexed | 2024-09-23T09:10:08Z |
| format | Article |
| id | mit-1721.1/141981 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:10:08Z |
| publishDate | 2022 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/1419812022-04-21T03:38:26Z Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 Alston, WN Pinto, C Barret, D D’Aì, A Del Santo, M Earnshaw, H Fabian, AC Fuerst, F Kara, E Kosec, P Middleton, MJ Parker, ML Pintore, F Robba, A Roberts, TP Sathyaprakash, R Walton, D Ambrosi, E <jats:title>ABSTRACT</jats:title> <jats:p>Most ultraluminous X-ray sources (ULXs) are believed to be stellar mass black holes or neutron stars accreting beyond the Eddington limit. Determining the nature of the compact object and the accretion mode from broad-band spectroscopy is currently a challenge, but the observed timing properties provide insight into the compact object and details of the geometry and accretion processes. Here, we report a timing analysis for an 800 ks XMM–Newton campaign on the supersoft ultraluminous X-ray source, NGC 247 ULX-1. Deep and frequent dips occur in the X-ray light curve, with the amplitude increasing with increasing energy band. Power spectra and coherence analysis reveals the dipping preferentially occurs on ∼5 and ∼10 ks time-scales. The dips can be caused by either the occultation of the central X-ray source by an optically thick structure, such as warping of the accretion disc, or from obscuration by a wind launched from the accretion disc, or both. This behaviour supports the idea that supersoft ULXs are viewed close to edge-on to the accretion disc.</jats:p> 2022-04-20T16:31:13Z 2022-04-20T16:31:13Z 2021 2022-04-20T16:27:59Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/141981 Alston, WN, Pinto, C, Barret, D, D’Aì, A, Del Santo, M et al. 2021. "Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1." Monthly Notices of the Royal Astronomical Society, 505 (3). en 10.1093/MNRAS/STAB1473 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press (OUP) arXiv |
| spellingShingle | Alston, WN Pinto, C Barret, D D’Aì, A Del Santo, M Earnshaw, H Fabian, AC Fuerst, F Kara, E Kosec, P Middleton, MJ Parker, ML Pintore, F Robba, A Roberts, TP Sathyaprakash, R Walton, D Ambrosi, E Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 |
| title | Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 |
| title_full | Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 |
| title_fullStr | Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 |
| title_full_unstemmed | Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 |
| title_short | Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 |
| title_sort | quasi periodic dipping in the ultraluminous x ray source ngc 247 ulx 1 |
| url | https://hdl.handle.net/1721.1/141981 |
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