eprintid: 10195874 rev_number: 7 eprint_status: archive userid: 699 dir: disk0/10/19/58/74 datestamp: 2024-08-19 11:51:33 lastmod: 2024-08-19 11:51:33 status_changed: 2024-08-19 11:51:33 type: article metadata_visibility: show sword_depositor: 699 creators_name: Ingram, A creators_name: Bollemeijer, N creators_name: Veledina, A creators_name: Dovčiak, M creators_name: Poutanen, J creators_name: Egron, E creators_name: Russell, TD creators_name: Trushkin, SA creators_name: Negro, M creators_name: Ratheesh, A creators_name: Capitanio, F creators_name: Connors, R creators_name: Neilsen, J creators_name: Kraus, A creators_name: Iacolina, MN creators_name: Pellizzoni, A creators_name: Pilia, M creators_name: Carotenuto, F creators_name: Matt, G creators_name: Mastroserio, G creators_name: Kaaret, P creators_name: Bianchi, S creators_name: García, JA creators_name: Bachetti, M creators_name: Wu, K creators_name: Costa, E creators_name: Ewing, M creators_name: Kravtsov, V creators_name: Krawczynski, H creators_name: Loktev, V creators_name: Marinucci, A creators_name: Marra, L creators_name: Mikušincová, R creators_name: Nathan, E creators_name: Parra, M creators_name: Petrucci, PO creators_name: Righini, S creators_name: Soffitta, P creators_name: Steiner, JF creators_name: Svoboda, J creators_name: Tombesi, F creators_name: Tugliani, S creators_name: Ursini, F creators_name: Yang, YJ creators_name: Zane, S creators_name: Zhang, W creators_name: Agudo, I creators_name: Antonelli, LA creators_name: Baldini, L creators_name: Baumgartner, WH creators_name: Bellazzini, R creators_name: Bongiorno, SD creators_name: Bonino, R creators_name: Brez, A creators_name: Bucciantini, N creators_name: Castellano, S creators_name: Cavazzuti, E creators_name: Chen, CT creators_name: Ciprini, S creators_name: De Rosa, A creators_name: Del Monte, E creators_name: Di Gesu, L creators_name: Di Lalla, N creators_name: Di Marco, A creators_name: Donnarumma, I creators_name: Doroshenko, V creators_name: Ehlert, SR creators_name: Enoto, T creators_name: Evangelista, Y creators_name: Fabiani, S creators_name: Ferrazzoli, R creators_name: Gunji, S creators_name: Hayashida, K creators_name: Heyl, J creators_name: Iwakiri, W creators_name: Jorstad, SG creators_name: Karas, V creators_name: Kislat, F creators_name: Kitaguchi, T creators_name: Kolodziejczak, JJ creators_name: La Monaca, F creators_name: Latronico, L creators_name: Liodakis, I creators_name: Maldera, S creators_name: Manfreda, A creators_name: Marin, F creators_name: Marscher, AP creators_name: Marshall, HL creators_name: Massaro, F creators_name: Mitsuishi, I creators_name: Mizuno, T creators_name: Muleri, F creators_name: Ng, CY creators_name: O’Dell, SL creators_name: Omodei, N creators_name: Oppedisano, C creators_name: Papitto, A creators_name: Pavlov, GG creators_name: Peirson, AL creators_name: Perri, M title: Tracking the X-Ray Polarization of the Black Hole Transient Swift J1727.8-1613 during a State Transition ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F63 note: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. abstract: We report on an observational campaign on the bright black hole (BH) X-ray binary Swift J1727.8-1613 centered around five observations by the Imaging X-ray Polarimetry Explorer. These observations track for the first time the evolution of the X-ray polarization of a BH X-ray binary across a hard to soft state transition. The 2-8 keV polarization degree decreased from ∼4% to ∼3% across the five observations, but the polarization angle remained oriented in the north-south direction throughout. Based on observations with the Australia Telescope Compact Array, we find that the intrinsic 7.25 GHz radio polarization aligns with the X-ray polarization. Assuming the radio polarization aligns with the jet direction (which can be tested in the future with higher-spatial-resolution images of the jet), our results imply that the X-ray corona is extended in the disk plane, rather than along the jet axis, for the entire hard intermediate state. This in turn implies that the long (≳10 ms) soft lags that we measure with the Neutron star Interior Composition ExploreR are dominated by processes other than pure light-crossing delays. Moreover, we find that the evolution of the soft lag amplitude with spectral state does not follow the trend seen for other sources, implying that Swift J1727.8-1613 is a member of a hitherto undersampled subpopulation. date: 2024-06-20 date_type: published publisher: American Astronomical Society official_url: https://doi.org/10.3847/1538-4357/ad3faf oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2290038 doi: 10.3847/1538-4357/ad3faf lyricists_name: Zane, Silvia lyricists_name: Wu, Kinwah lyricists_id: SZANE58 lyricists_id: KWUXX50 actors_name: Zane, Silvia actors_id: SZANE58 actors_role: owner full_text_status: public publication: Astrophysical Journal volume: 968 number: 2 pagerange: 76-76 issn: 0004-637X citation: Ingram, A; Bollemeijer, N; Veledina, A; Dovčiak, M; Poutanen, J; Egron, E; Russell, TD; ... Perri, M; + view all <#> Ingram, A; Bollemeijer, N; Veledina, A; Dovčiak, M; Poutanen, J; Egron, E; Russell, TD; Trushkin, SA; Negro, M; Ratheesh, A; Capitanio, F; Connors, R; Neilsen, J; Kraus, A; Iacolina, MN; Pellizzoni, A; Pilia, M; Carotenuto, F; Matt, G; Mastroserio, G; Kaaret, P; Bianchi, S; García, JA; Bachetti, M; Wu, K; Costa, E; Ewing, M; Kravtsov, V; Krawczynski, H; Loktev, V; Marinucci, A; Marra, L; Mikušincová, R; Nathan, E; Parra, M; Petrucci, PO; Righini, S; Soffitta, P; Steiner, JF; Svoboda, J; Tombesi, F; Tugliani, S; Ursini, F; Yang, YJ; Zane, S; Zhang, W; Agudo, I; Antonelli, LA; Baldini, L; Baumgartner, WH; Bellazzini, R; Bongiorno, SD; Bonino, R; Brez, A; Bucciantini, N; Castellano, S; Cavazzuti, E; Chen, CT; Ciprini, S; De Rosa, A; Del Monte, E; Di Gesu, L; Di Lalla, N; Di Marco, A; Donnarumma, I; Doroshenko, V; Ehlert, SR; Enoto, T; Evangelista, Y; Fabiani, S; Ferrazzoli, R; Gunji, S; Hayashida, K; Heyl, J; Iwakiri, W; Jorstad, SG; Karas, V; Kislat, F; Kitaguchi, T; Kolodziejczak, JJ; La Monaca, F; Latronico, L; Liodakis, I; Maldera, S; Manfreda, A; Marin, F; Marscher, AP; Marshall, HL; Massaro, F; Mitsuishi, I; Mizuno, T; Muleri, F; Ng, CY; O’Dell, SL; Omodei, N; Oppedisano, C; Papitto, A; Pavlov, GG; Peirson, AL; Perri, M; - view fewer <#> (2024) Tracking the X-Ray Polarization of the Black Hole Transient Swift J1727.8-1613 during a State Transition. Astrophysical Journal , 968 (2) p. 76. 10.3847/1538-4357/ad3faf <https://doi.org/10.3847/1538-4357%2Fad3faf>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10195874/1/Ingram_2024_ApJ_968_76.pdf