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- W4381249063 abstract "Abstract We present the X-ray monitoring campaign of AT2022tsd in the time range δ t rest = 23–116 days rest-frame since discovery. With an initial 0.3–10 keV X-ray luminosity of L x ≈ 10 44 erg s −1 at δ t rest ≈ 23 days, AT2022tsd is the most luminous FBOT to date and rivals 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 <?CDATA ${rm{Gamma }}={1.89}_{-0.08}^{+0.09}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi mathvariant=normal>Γ</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>1.89</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.08</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.09</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> and marginal evidence at the 3 σ confidence level for intrinsic absorption NH int ≈ 4 × 10 19 cm −2 . The X-ray light-curve can be either interpreted as a power-law decay L x ∝ t α with α ≈ − 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." @default.
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- W4381249063 date "2023-06-19" @default.
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- W4381249063 title "Unprecedented X-Ray Emission from the Fast Blue Optical Transient AT2022tsd" @default.
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- W4381249063 doi "https://doi.org/10.3847/2515-5172/acdde1" @default.
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