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 3.

Results of the X-ray spectral fitting for the UGS1 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]
4FGL J0003.6+3059	XRT J000402.65+310219.8	4.64 $_{- 1.01}^{+ 1.01}$ $_{-1.01}^{+1.01}$	6.8	2	4.3 $_{- 1.1}^{+ 1.1}$ $_{-1.1}^{+1.1}$	2.0 $_{- 0.5}^{+ 0.5}$ $_{-0.5}^{+0.5}$	0.01(1)
4FGL J0004.4−4001	XRT J000434.22−400034.7	9.68 $_{- 1.04}^{+ 1.04}$ $_{-1.04}^{+1.04}$	1.2	2.5 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	7.2 $_{- 0.9}^{+ 0.9}$ $_{-0.9}^{+0.9}$	3.2 $_{- 0.4}^{+ 0.4}$ $_{-0.4}^{+0.4}$	0.9(8)
4FGL J0006.6+4618	XRT J000652.09+461813.9	4.19 $_{- 1.00}^{+ 1.00}$ $_{-1.00}^{+1.00}$	11.0	2	5.8 $_{- 1.6}^{+ 1.6}$ $_{-1.6}^{+1.6}$	2.5 $_{- 0.7}^{+ 0.7}$ $_{-0.7}^{+0.7}$	–
4FGL J0009.1−5012	XRT J000908.61−501000.9	4.53 $_{- 1.01}^{+ 1.01}$ $_{-1.01}^{+1.01}$	1.4	2	4.7 $_{- 1.5}^{+ 1.5}$ $_{-1.5}^{+1.5}$	2.5 $_{- 0.8}^{+ 0.8}$ $_{-0.8}^{+0.8}$	–
4FGL J0022.0−5921	XRT J002127.45−591946.3	6.14 $_{- 1.19}^{+ 1.19}$ $_{-1.19}^{+1.19}$	1.4	2	6.1 $_{- 1.3}^{+ 1.3}$ $_{-1.3}^{+1.3}$	3.2 $_{- 0.7}^{+ 0.7}$ $_{-0.7}^{+0.7}$	0.7(2)
4FGL J0023.2+8412	XRT J002403.36+841352.6	13.42 $_{- 2.84}^{+ 2.84}$ $_{-2.84}^{+2.84}$	11.0	2	11.0 $_{- 2.9}^{+ 2.9}$ $_{-2.9}^{+2.9}$	5.0 $_{- 1.4}^{+ 1.4}$ $_{-1.4}^{+1.4}$	1.2(1)
4FGL J0023.6−4209	XRT J002303.59−420509.6	12.60 $_{- 1.96}^{+ 1.96}$ $_{-1.96}^{+1.96}$	1.4	1.2 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	11.0 $_{- 2.0}^{+ 2.0}$ $_{-2.0}^{+2.0}$	12.6 $_{- 3.5}^{+ 4.4}$ $_{-3.5}^{+4.4}$	0.8(3)
4FGL J0025.4−4838	XRT J002536.94−483810.9	12.97 $_{- 1.77}^{+ 1.77}$ $_{-1.77}^{+1.77}$	1.8	2.5 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	8.6 $_{- 1.4}^{+ 1.4}$ $_{-1.4}^{+1.4}$	4.0 $_{- 0.7}^{+ 0.7}$ $_{-0.7}^{+0.7}$	1.8(4)
4FGL J0026.1−0732	XRT J002611.55−073116.0	94.75 $_{- 3.81}^{+ 3.81}$ $_{-3.81}^{+3.81}$	4.0	2.2 $_{- 0.1}^{+ 0.1}$ $_{-0.1}^{+0.1}$	77.0 $_{- 3.3}^{+ 3.3}$ $_{-3.3}^{+3.3}$	31.6 $_{- 1.4}^{+ 1.5}$ $_{-1.4}^{+1.5}$	0.7(66)
4FGL J0027.0−1134	XRT J002710.11−113638.7	22.40 $_{- 3.50}^{+ 3.50}$ $_{-3.50}^{+3.50}$	2.9	2.0 $_{- 0.3}^{+ 0.3}$ $_{-0.3}^{+0.3}$	21.0 $_{- 3.6}^{+ 3.6}$ $_{-3.6}^{+3.6}$	10.0 $_{- 2.1}^{+ 2.0}$ $_{-2.1}^{+2.0}$	1.0(3)

Notes. (1) 4FGL Name. (2) Name of the Swift/XRT source. (3) Swift/XRT count rate. (4) Equivalent hydrogen column density (cm⁻²), provided by the HI4PI Collaboration (2016) database. (5) Power-law index. (6) Normalisation factor (photons keV⁻¹ cm⁻² s⁻¹) at 1 keV. (7) Absorbed flux in the range 0.3−10 keV (erg cm⁻² s⁻¹); (8) $χ_{ν}^{2}$ $\chi^{2}_{\nu}$ (and the relative degrees of freedom). The spectral data quality of the sources for which the $χ_{ν}^{2}$ $\chi^{2}_{\nu}$ does not appear in the table is too poor to allow for a spectral fitting. For these sources, we just converted the observed source count rate into a flux (see text). 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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