تقرير
Unprecedented X-ray Emission from the Fast Blue Optical Transient AT2022tsd
| العنوان: | Unprecedented X-ray Emission from the Fast Blue Optical Transient AT2022tsd |
|---|---|
| المؤلفون: | Matthews, D. J., Margutti, R., Metzger, B. D., Milisavljevic, D., Migliori, G., Laskar, T., Brethauer, D., Berger, E., Chornock, R., Drout, M., Ramirez-Ruiz, E. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | We present the X-ray monitoring campaign of AT2022tsd in the time range $\delta t_{rest} = 23 - 116$ d rest-frame since discovery. With an initial 0.3-10 keV X-ray luminosity of $L_x \approx 10^{44}$ erg s$^{-1}$ at $\delta t_{rest}\approx$ 23 d, AT2022tsd is the most luminous FBOT to date and rivals even the most luminous GRBs. We find no statistical evidence for spectral evolution. The average X-ray spectrum is well described by an absorbed simple power-law spectral model with best-fitting photon index $\Gamma = 1.89 ^{+0.09}_{-0.08}$ and marginal evidence at the 3$\sigma$ confidence level for intrinsic absorption $NH_{int}\approx 4\times10^{19}$ cm$^{-2}$. The X-ray light-curve behavior can be either interpreted as a power-law decay $L_x\propto t^{\alpha}$ with $\alpha\approx -2$ and superimposed X-ray variability, or as a broken power-law with a steeper post-break decay as observed in other FBOTs such as AT2018cow. We briefly compare these results to accretion models of TDEs and GRB afterglow models. Comment: 5 pages, 1 figure, 1 table. Submitted to RNAAS |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2306.01114 |
| رقم الأكسشن: | edsarx.2306.01114 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |