Search for the multi-wavelength counterparts to extragalactic unassociated Fermi γ-ray sources

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Volume 694 (February 2025)

A&A, 694 (2025) A176

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Table 4.

Results of the X-ray spectral fitting for the UGS2 subsample.

4FGL Name (1)	Swift/XRT source (2)	Count rate (3)	nH (4)	Γ (5)	Norm. (6)	Absorbed flux (7)	$χ_{ν}^{2}$ $\chi^{2}_{\nu}$ (d.o.f.) (8)
		[×10⁻³]	[×10²⁰]		10⁻⁵	[×10⁻¹³]
	XRT J001708.63−460607.7	6.44 $_{- 0.84}^{+ 0.84}$ $_{-0.84}^{+0.84}$	1.6	1.8 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	5.0 $_{- 0.7}^{+ 0.7}$ $_{-0.7}^{+0.7}$	3.2 $_{- 0.7}^{+ 0.7}$ $_{-0.7}^{+0.7}$	0.6(6)
4FGL J0017.1−4605	XRT J001750.81−460437.5	3.95 $_{- 0.66}^{+ 0.66}$ $_{-0.66}^{+0.66}$	1.6	−0.1 $_{- 0.6}^{+ 0.5}$ $_{-0.6}^{+0.5}$	1.3 $_{- 0.5}^{+ 0.5}$ $_{-0.5}^{+0.5}$	12.6 $_{- 6.1}^{+ 13.1}$ $_{-6.1}^{+13.1}$	1.3(2)
	XRT J001705.00−460109.2	1.47 $_{- 0.42}^{+ 0.42}$ $_{-0.42}^{+0.42}$	1.6	2	1.1 $_{- 0.4}^{+ 0.4}$ $_{-0.4}^{+0.4}$	0.6 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	–

4FGL J0031.0−2327	XRT J003120.53−233400.7	44.80 $_{- 2.08}^{+ 2.08}$ $_{-2.08}^{+2.08}$	1.7	1.8 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	34.0 $_{- 1.8}^{+ 1.8}$ $_{-1.8}^{+1.8}$	20.0 $_{- 1.3}^{+ 1.4}$ $_{-1.3}^{+1.4}$	0.9(50)
4FGL J0031.0−2327	XRT J003039.79-232821.2	1.93 $_{- 0.48}^{+ 0.48}$ $_{-0.48}^{+0.48}$	1.7	2	1.6 $_{- 0.5}^{+ 0.5}$ $_{-0.5}^{+0.5}$	0.8 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	–

	XRT J004016.42−271912.3	22.59 $_{- 0.83}^{+ 0.83}$ $_{-0.83}^{+0.83}$	1.4	2.7 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	16.0 $_{- 0.6}^{+ 0.6}$ $_{-0.6}^{+0.6}$	6.3 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	1.1(72)
	XRT J004023.77−272254.2	1.32 $_{- 0.22}^{+ 0.22}$ $_{-0.22}^{+0.22}$	1.4	7.2 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	0.4 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	3.2 $_{- 0.9}^{+ 1.0}$ $_{-0.9}^{+1.0}$	1.0(4)
4FGL J0040.2−2725	XRT J004026.07−272116.1	1.51 $_{- 0.23}^{+ 0.23}$ $_{-0.23}^{+0.23}$	1.4	2.5 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	1.3 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	0.5 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.8(5)
	XRT J004035.80−272240.7	0.91 $_{- 0.19}^{+ 0.19}$ $_{-0.19}^{+0.19}$	1.4	1.1 $_{- 0.6}^{+ 0.6}$ $_{-0.6}^{+0.6}$	0.5 $_{- 0.2}^{+ 0.1}$ $_{-0.2}^{+0.1}$	0.6 $_{- 0.3}^{+ 0.5}$ $_{-0.3}^{+0.5}$	2.4(2)
	XRT J003954.35−272516.1	0.63 $_{- 0.16}^{+ 0.16}$ $_{-0.16}^{+0.16}$	1.5	2	0.4 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.3 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	3.0(2)

4FGL J0045.8−1324	XRT J004602.94−132422.2	4.00 $_{- 0.44}^{+ 0.44}$ $_{-0.44}^{+0.44}$	1.7	2.2 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	3.3 $_{- 0.4}^{+ 0.4}$ $_{-0.4}^{+0.4}$	1.6 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	0.8(10)
	XRT J004608.32−132213.6	1.90 $_{- 0.32}^{+ 0.32}$ $_{-0.32}^{+0.32}$	1.7	1.1 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	1.1 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	1.6 $_{- 0.4}^{+ 0.5}$ $_{-0.4}^{+0.5}$	1.1(4)
	XRT J004611.48−132519.3	1.68 $_{- 0.30}^{+ 0.30}$ $_{-0.30}^{+0.30}$	1.7	1.7 $_{- 0.4}^{+ 0.4}$ $_{-0.4}^{+0.4}$	1.8 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	1.3 $_{- 0.4}^{+ 0.8}$ $_{-0.4}^{+0.8}$	1.2(3)
	XRT J004539.41−132507.7	0.87 $_{- 0.23}^{+ 0.23}$ $_{-0.23}^{+0.23}$	1.7	2	0.8 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	0.4 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.9(2)
	XRT J004602.97−131959.0	0.39 $_{- 0.20}^{+ 0.20}$ $_{-0.20}^{+0.20}$	1.8	2	0.5 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	0.3 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	–
	XRT J004555.20−132312.5	0.73 $_{- 0.22}^{+ 0.22}$ $_{-0.22}^{+0.22}$	1.7	2	0.6 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	0.3 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	2.4(1)

4FGL J0102.3+1000	XRT J010226.89+095939.9	0.47 $_{- 0.14}^{+ 0.14}$ $_{-0.14}^{+0.14}$	4.3	2.4 $_{- 0.8}^{+ 0.7}$ $_{-0.8}^{+0.7}$	0.6 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.3 $_{- 0.1}^{+ 0.2}$ $_{-0.1}^{+0.2}$	1.1(2)
	XRT J010235.93+095832.4	0.26 $_{- 0.11}^{+ 0.11}$ $_{-0.11}^{+0.11}$	4.3	2	0.3 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.1 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	–
	XRT J010220.73+095848.9	0.36 $_{- 0.12}^{+ 0.12}$ $_{-0.12}^{+0.12}$	4.3	2	0.4 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.2 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.5(2)
	XRT J010214.03+100258.4	0.39 $_{- 0.12}^{+ 0.12}$ $_{-0.12}^{+0.12}$	4.3	2	0.3 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	0.2 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	3.3(1)

Notes. The labels are the same as in Table 3. A portion of the table is shown here to demonstrate its form and content. A machine-readable version of the full table is available at the CDS.

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