Constraining the synchrotron peak and estimating the very high energy brightness of a sample of extreme high synchrotron peak blazars

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Volume 708 (April 2026)

A&A, 708 (2026) A340

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Table 4.

Properties of the sources with chances of observation as reported in Table 3.

Source	RA, DEC	Redshift	νF_{ν, 2 − 10 keV}	νF_{ν, 100 GeV, LP model}	νF_{ν, 100 GeV, BPL model}
			[10⁻¹² erg s⁻¹ cm⁻²]	[10⁻¹² erg s⁻¹ cm⁻²]	[10⁻¹² erg s⁻¹ cm⁻²]
5BZBJ1253+3826	12:53:00.90, +38:26:26.01	0.371	$1 . 46_{- 0.19}^{+ 0.22}$ $Mathematical equation: $ 1.46^{+0.22}_{-0.19} $$	0.17 – 0.63	0.13 – 0.15
5BZBJ1636−1248	16:36:58.42, −12:48:36.5	0.246	$0 . 61_{- 0.26}^{+ 0.40}$ $Mathematical equation: $ 0.61^{+0.40}_{-0.26} $$	0.30 – 1.52	0.21 – 0.51
5BZBJ1251−2958	12:51:34.88, −29:58:42.88	0.382	$0 . 73_{- 0.10}^{+ 0.12}$ $Mathematical equation: $ 0.73^{+0.12}_{-0.10} $$	0.37 – 1.46	0.29 – 0.64
5BZBJ0040−2719	00:40:16.40, −27:19:11.60	0.172	$0 . 59_{- 0.08}^{+ 0.08}$ $Mathematical equation: $ 0.59^{+0.08}_{-0.08} $$	0.19 – 1.00	0.12 – 0.18
5BZBJ1057+2303	10:57:23.09, +23:03:18.79	0.379	$1 . 22_{- 0.26}^{+ 0.33}$ $Mathematical equation: $ 1.22^{+0.33}_{-0.26} $$	0.51 –1.38	0.58 – 1.16
5BZBJ1258+0134	12:58:54.59, +01:34:41.41	-99	$0 . 29_{- 0.17}^{+ 0.56}$ $Mathematical equation: $ 0.29^{+0.56}_{-0.17} $$	0.16 – 1.10	0.09 – 0.37

Notes. The coordinates (RA, DEC) and redshift are reported from the 5BZCAT catalogue, while the fluxes come from this work. The X-ray flux in the band 2–10 keV comes from the X-ray analysis results, while the VHE flux at 100 GeV corresponds to the range of fluxes established by the models in Sect. 5. As mentioned in the text, we caution that the lack of a spectroscopic redshift can affect the reliability of the VHE predictions for 5BZBJ1258+0134.

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