File:Staa2626.pdf
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A thousand days after the merger: Continued X-ray emission from GW170817
Summary
[edit]DescriptionStaa2626.pdf |
Français : Recent observations with the Chandra X-ray telescope continue to detect X-ray emission from the transient GW170817. In a total exposure of 96.6 ks, performed between 2020 March 9 and 16 (935–942 d after the merger), a total of 8 photons are measured at the source position, corresponding to a significance of ≈5σ. Radio monitoring with the Australian Telescope Compact Array (ATCA) shows instead that the source has faded below our detection threshold (<33 μJy, 3σ). By assuming a constant spectral index of β = 0.585, we derive an unabsorbed X-ray flux of ≈1.4 × 10−15 erg cm−2 s−1, higher than earlier predictions, yet still consistent with a simple structured jet model. We discuss possible scenarios that could account for prolonged emission in X-rays. The current data set appears consistent both with energy injection by a long-lived central engine and with the onset of a kilonova afterglow, arising from the interaction of the sub-relativistic merger ejecta with the surrounding medium. Long-term monitoring of this source will be essential to test these different models. |
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Source |
https://academic.oup.com/mnras/article/498/4/5643/5918334 https://doi.org/10.1093/mnras/staa2626 |
Author | E Troja, H van Eerten, B Zhang, G Ryan, L Piro, R Ricci, B O’Connor, M H Wieringa, S B Cenko, T Sakamoto |
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current | 14:22, 15 October 2020 | ![]() | 1,239 × 1,629, 9 pages (542 KB) | Pamputt (talk | contribs) | Uploaded a work by E Troja, H van Eerten, B Zhang, G Ryan, L Piro, R Ricci, B O’Connor, M H Wieringa, S B Cenko, T Sakamoto from https://academic.oup.com/mnras/article/498/4/5643/5918334 https://doi.org/10.1093/mnras/staa2626 with UploadWizard |
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