تقرير
An ultrafast outflow in the black hole candidate MAXI J1810-222?
| العنوان: | An ultrafast outflow in the black hole candidate MAXI J1810-222? |
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| المؤلفون: | Del Santo, M., Pinto, C., Marino, A., D'Aì, A., Petrucci, P. -O., Malzac, J., Ferreira, J., Pintore, F., Motta, S. E., Russell, T. D., Segreto, A., Sanna, A. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | The transient X-ray source MAXI J1810-222 was discovered in 2018 and has been active ever since. A long combined radio and X-ray monitoring campaign was performed with ATCA and Swift respectively. It has been proposed that MAXI J1810-222 is a relatively distant black hole X-ray binary, albeit showing a very peculiar outburst behaviour. Here, we report on the spectral study of this source making use of a large sample of NICER observations performed between 2019 February and 2020 September. We detected a strong spectral absorption feature at $\sim$1 keV, which we have characterised with a physical photoionisation model. Via a deep scan of the parameters space, we obtained evidence for a spectral-state dependent outflow, with mildly relativistic speeds. In particular, the soft and intermediate states point to a hot plasma outflowing at 0.05-0.15 $c$. This speeds rule-out thermal winds and, hence, they suggest that such outflows could be radiation pressure or (most likely) magnetically-driven winds. Our results are crucial to test current theoretical models of wind formation in X-ray binaries. Comment: 6 pages, 10 figures, accepted for publication in MNRAS Letter |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnrasl/slad048 |
| URL الوصول: | http://arxiv.org/abs/2304.08514 |
| رقم الأكسشن: | edsarx.2304.08514 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnrasl/slad048 |
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