New JWST redshifts for the host galaxies of CDF-S XT1 and XT2: Understanding their nature

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Table 1.

X-ray properties taken from the literature of the two extragalactic FXTs considered in this work.

Target	ObsID	Exp. (ks)	Date	RA	Dec	Pos. unc.	T₉₀ (ks)	Ref.
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
XT1	16454	49.5	2014-10-01	53.161550	−27.859353	$0 \overset{″}{.} 26$ $0{{\overset{\prime\prime}{.}}}26$	$5 . 0_{- 0.3}^{+ 4.2}$ $5.0^{+4.2}_{-0.3}$	(1), (2)
XT2	16453	74.7	2015-03-22	53.076583	−27.873389	$0 \overset{″}{.} 11$ $0{{\overset{\prime\prime}{.}}}11$	$10 . 3_{- 6.3}^{+ 9.0}$ $10.3_{-6.3}^{+9.0}$	(3), (4)

Notes. Column 1: X-ray transient identifier. Column 2: Chandra observation ID detection. Column 3: Exposure time of observation. Column 4: Detection date. Columns 5 and 6: Right Ascension and Declination in J2000 equatorial coordinates, in units of degrees, of the FXTs from literature. Column 7: Estimated 1σ X-ray positional uncertainty, in units of arcseconds. Column 8: T₉₀ duration. Column 9: References: (1) Bauer et al. (2017), (2) Quirola-Vásquez et al. (2022), (3) Xue et al. (2019), (4) Quirola-Vásquez et al. (2023).

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