%0 Journal Article %@ 0004-637X %A Marshall, HL %A Liodakis, I %A Marscher, AP %A Di Lalla, N %A Jorstad, SG %A Kim, DE %A Middei, R %A Negro, M %A Omodei, N %A Peirson, AL %A Perri, M %A Puccetti, S %A Laurenti, M %A Agudo, I %A Bonnoli, G %A Berdyugin, AV %A Cavazzuti, E %A Rodriguez Cavero, N %A Donnarumma, I %A Di Gesu, L %A Jormanainen, J %A Krawczynski, H %A Lindfors, E %A Madjeski, G %A Marin, F %A Massaro, F %A Pacciani, L %A Poutanen, J %A Tavecchio, F %A Kouch, PM %A Aceituno, FJ %A Bernardos, MI %A Casanova, V %A García-Comas, M %A Agís-González, B %A Husillos, C %A Marchini, A %A Sota, A %A Blinov, D %A Bourbah, IG %A Kielhmann, S %A Kontopodis, E %A Mandarakas, N %A Romanopoulos, S %A Skalidis, R %A Vervelaki, A %A Borman, GA %A Kopatskaya, EN %A Larionova, EG %A Morozova, DA %A Savchenko, SS %A Vasilyev, AA %A Zhovtan, AV %A Casadio, C %A Escudero, J %A Kramer, J %A Myserlis, I %A Trainou, E %A Imazawa, R %A Sasada, M %A Fukazawa, Y %A Kawabata, KS %A Uemura, M %A Mizuno, T %A Nakaoka, T %A Akitaya, H %A Masiero, JR %A Mawet, D %A Panopoulou, GV %A Tinyanont, S %A Kagitani, M %A Kravtsov, V %A Sakanoi, T %A Dattolo, M %A Gurwell, M %A Keating, G %A Rao, R %A Cheong, WY %A Jeong, HW %A Kang, S %A Kim, SH %A Lee, SS %A Angelakis, E %A Kraus, A %A Hales, A %A Kameno, S %A Kneissl, R %A Messias, H %A Nagai, H %A Antonelli, LA %A Bachetti, M %A Baldini, L %A Baumgartner, WH %A Bellazzini, R %A Bianchi, S %A Bongiorno, SD %A Bonino, R %A Brez, A %A Bucciantini, N %A Capitanio, F %D 2024 %F discovery:10197388 %I American Astronomical Society %J The Astrophysical Journal %N 1 %T Observations of Low and Intermediate Spectral Peak Blazars with the Imaging X-Ray Polarimetry Explorer %U https://discovery.ucl.ac.uk/id/eprint/10197388/ %V 972 %X We present X-ray polarimetry observations from the Imaging X-ray Polarimetry Explorer (IXPE) of three low spectral peak and one intermediate spectral peak blazars, namely 3C 273, 3C 279, 3C 454.3, and S5 0716+714. For none of these objects was IXPE able to detect X-ray polarization at the 3σ level. However, we placed upper limits on the polarization degree at ∼10%-30%. The undetected polarizations favor models where the X-ray band is dominated by unpolarized photons upscattered by relativistic electrons in the jets of blazars, although hadronic models are not completely eliminated. We discuss the X-ray polarization upper limits in the context of our contemporaneous multiwavelength polarization campaigns. %Z Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence, https://creativecommons.org/licenses/by/4.0/. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.