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Table A.2.

IXPE observations of the HSP sample taken into account in this work, together with the previous publications used for this analysis.

Source obsID Dates Jet direction Polarisation properties
Mrk 421 01003701 May 4-6, 2022 Weaver et al. (2022) Di Gesu et al. (2022)
01003801 Jun 4-6, 2022 Di Gesu et al. (2023)
02004401 Dec 6-8, 2022 Kim et al. (2024)
02008199 Dec 6-22, 2023 Maksym et al. (2024) Maksym et al. (2024)

Mrk 501 01004501 Mar 8-10, 2022 Weaver et al. (2022) Chen et al. (2024)
01004601 Mar 27-29, 2022
01004701 Jul 9-12, 2022
02004601 Feb 12-14, 2023
02004501* Mar 19-21, 2023
02004701 Apr 16-18, 2023
03008801 Apr 8-10, 2024 This work
03008901 Jul 7-9, 2024 This work
03009001 Aug 10-12, 2024 This work
03009101* Jan 3-5, 2025 This work

1ES 1959+650 01006201 May 3-4, 2022 Errando et al. (2024) Errando et al. (2024)
01006001⋆ Jun 9-12, 2022
02004801 Oct 28-31, 2022 Pacciani et al. (2025) Pacciani et al. (2025)
02250801 Aug 14-19, 2023

1ES 0229+200 01006499 Jan 15-Feb 1, 2023 Piner & Edwards (2018) Ehlert et al. (2023)

PG 1553+113 02004999 Feb 1-9, 2023 90° † Middei et al. (2023b)

PKS 2155−304 02005601 Oct 27-Nov 7, 2023 Kouch et al. (2024) Kouch et al. (2024)

Notes. The columns "Jet direction" and "Polarisation properties" refer to the works from which the values of the jet direction and the average PD, PA and errors were taken. The observations reported with * were not taken into account for this analysis, as they were 3σ upper limits on PD and not detections. The observation reported with ⋆ was originally divided into four equal time bins, of which we only used the third, as the other three were upper limits. The value reported with † comes from private communications. No error was indicated, therefore the value used was the average over the errors of the other jet measurements. For the new IXPE observations of Mrk 501 (indicated with "This work"), see Table B.1.

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