A new look at the extragalactic very high energy sky: Searching for TeV-emitting candidates among the X-ray-bright, non-Fermi-detected blazar population

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Volume 693 (January 2025)

A&A, 693 (2025) A142

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Table 1

Summary of 5BZCAT sources detected in different catalogs of X-ray sources.

Catalog	X-ray instrument	Area covered (deg²)	Sources	With Fermi-LAT	Without Fermi-LAT
4XMM-DR13	XMM-Newton	1328	313	181 (58%)	132 (42%)
2CSC	Chandra	560	218	131 (60%)	87 (40%)
2SXPS	Swift-XRT	3790	1666	1191 (71%)	475 (29%)
eRASS1	eROSITA	20 627	1379	726 (52%)	653 (48%)
NuBlazar	NuSTAR	6	114	88 (77%)	26 (23%)

	4XMM-DR13 or 2CSC		464	271 (58%)	193 (42%)
	2SXPS, no 4XMM or2CSC		1347	968 (72%)	379 (28%)
	eRASS1 only		624	189 (30%)	435 (70%)

	Overall		2435	1428 (59%)	1007 (41%)
	Of which in TeVCAT		77	77 (100%)	0 (0%)

Notes. For each catalog, or combination of catalogs, we also report the number of sources with and without a counterpart in the Fermi-LAT 4FGL-DR4 catalog of sources detected in the 50 MeV–1 TeV energy range.

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