SDSS1335+0728: The awakening of a ∼106 M⊙ black hole

Open Access

Fig. 5.

Swift/XRT spectrum of the source detected at a distance of $6 \overset{″}{.} 0 \pm 3 \overset{″}{.} 6$ $6{{\overset{\prime\prime}{.}}}0\pm3{{\overset{\prime\prime}{.}}}6$ from the nucleus of SDSS1335+0728, obtained on February 4, 2024. Top: the blue circles show the data, and the black dashed line shows the black body model with kT = 104 ± 9 eV. Bottom: residual of the modelling (the difference between the original spectrum and the fit).

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