A systematic search for spectral hardening in blazar flares with the Fermi-Large Area Telescope

Open Access

Table 1.

Blazars with TS_hardening ≥ 12.

4FGL source	Association	$ν_{s}^{peak}$ $\nu^{\mathrm{peak}}_{\mathrm{s}}$	Period (MJD)	Method	E_b (GeV)	\|ΔΓ\|	TS_hard
Name (1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
J0238.4−3116	1RXS J023832.6–311658	16.8	54913.65–55144.65	Flip	$0.39 \pm_{0.11}^{0.24}$ $0.39\pm ^{0.24}_{0.11}$	1.94 ± 0.32	12.0
J2158.8−3013	PKS 2155–304	16.2	57692.65–57748.65	Flip	$0.11 \pm_{0.01}^{0.02}$ $0.11\pm ^{0.02}_{0.01}$	2.54 ± 0.32	16.0
J2158.8−3013	PKS 2155–304	16.2	57706.65–57734.65	BL	$0.12 \pm_{0.01}^{0.02}$ $0.12\pm ^{0.02}_{0.01}$	1.80 ± 0.34	12.0

Notes. A list of 3 events in 2 blazars with TS_hardening ≥ 12, identified using the Flip and Baseline methods. The two events in PKS 2155−304 correspond to the same underlying flare but are detected independently by the two flare selection methods. Therefore, they represent a single flaring episode captured with slightly different boundaries. (1) 4FGL source name, (2) Association with known sources, (3) Synchrotron peak ( $ν_{s}^{peak}$ $\nu_{\mathrm{s}}^{\mathrm{peak}}$ ) in log units of Hz, see main text for references, (4) Time period of the event, (5) Method which identified the flare: Flip or Baseline method, (6) break energy in GeV, (7) Difference of the BPL indexes, note that these are negative values, but we list the absolute value and (8) TS_hardening.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.