eprintid: 10186104
rev_number: 7
eprint_status: archive
userid: 699
dir: disk0/10/18/61/04
datestamp: 2024-01-25 13:38:12
lastmod: 2024-01-25 13:38:12
status_changed: 2024-01-25 13:38:12
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: La Monaca, F
creators_name: Di Marco, A
creators_name: Poutanen, J
creators_name: Bachetti, M
creators_name: Motta, SE
creators_name: Papitto, A
creators_name: Pilia, M
creators_name: Xie, F
creators_name: Bianchi, S
creators_name: Bobrikova, A
creators_name: Costa, E
creators_name: Deng, W
creators_name: Ge, MY
creators_name: Illiano, G
creators_name: Jia, SM
creators_name: Krawczynski, H
creators_name: Lai, EV
creators_name: Liu, K
creators_name: Mastroserio, G
creators_name: Muleri, F
creators_name: Rankin, J
creators_name: Soffitta, P
creators_name: Veledina, A
creators_name: Ambrosino, F
creators_name: Del Santo, M
creators_name: Chen, W
creators_name: Garcia, JA
creators_name: Kaaret, P
creators_name: Russell, TD
creators_name: Wei, WH
creators_name: Zhang, SN
creators_name: Zuo, C
creators_name: Arzoumanian, Z
creators_name: Cocchi, M
creators_name: Gnarini, A
creators_name: Farinelli, R
creators_name: Gendreau, K
creators_name: Ursini, F
creators_name: Weisskopf, MC
creators_name: Zane, S
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: Capitanio, F
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: Donnarumma, I
creators_name: Doroshenko, V
creators_name: Dovčiak, M
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: Latronico, L
creators_name: Liodakis, I
creators_name: Maldera, S
creators_name: Manfreda, A
creators_name: Marin, F
creators_name: Marinucci, A
creators_name: Marscher, AP
creators_name: Marshall, HL
creators_name: Massaro, F
creators_name: Matt, G
creators_name: Mitsuishi, I
creators_name: Mizuno, T
creators_name: Negro, M
creators_name: Ng, CY
creators_name: O’Dell, SL
creators_name: Omodei, N
creators_name: Oppedisano, C
creators_name: Pavlov, GG
creators_name: Peirson, AL
creators_name: Perri, M
creators_name: Pesce-Rollins, M
creators_name: Petrucci, PO
creators_name: Possenti, A
creators_name: Puccetti, S
creators_name: Ramsey, BD
title: Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1
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, 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.
abstract: The Imaging X-ray Polarimetry Explorer measured with high significance the X-ray polarization of the brightest Z-source, Sco X-1, resulting in the nominal 2–8 keV energy band in a polarization degree of 1.0% ± 0.2% and a polarization angle of 8° ± 6° at a 90% confidence level. This observation was strictly simultaneous with observations performed by NICER, NuSTAR, and Insight-HXMT, which allowed for a precise characterization of its broadband spectrum from soft to hard X-rays. The source has been observed mainly in its soft state, with short periods of flaring. We also observed low-frequency quasiperiodic oscillations. From a spectropolarimetric analysis, we associate a polarization to the accretion disk at <3.2% at 90% confidence level, compatible with expectations for an electron scattering dominated optically thick atmosphere at the Sco X-1 inclination of ∼44°; for the higher-energy Comptonized component, we obtain a polarization of 1.3% ± 0.4%, in agreement with expectations for a slab of Thomson optical depth of ∼7 and an electron temperature of ∼3 keV. A polarization rotation with respect to previous observations by OSO-8 and PolarLight, and also with respect to the radio-jet position angle, is observed. This result may indicate a variation of the polarization with the source state that can be related to relativistic precession or a change in the corona geometry with the accretion flow.
date: 2024-01-10
date_type: published
official_url: https://doi.org/10.3847/2041-8213/ad132d
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2141354
doi: 10.3847/2041-8213/ad132d
lyricists_name: Zane, Silvia
lyricists_id: SZANE58
actors_name: Flynn, Bernadette
actors_id: BFFLY94
actors_role: owner
full_text_status: public
publication: The Astrophysical Journal Letters
volume: 960
number: 2
article_number: L11
issn: 2041-8205
citation:        La Monaca, F;    Di Marco, A;    Poutanen, J;    Bachetti, M;    Motta, SE;    Papitto, A;    Pilia, M;                                                                                                                                                                                                                                                                                                                                                                                     ... Ramsey, BD; + view all <#>        La Monaca, F;  Di Marco, A;  Poutanen, J;  Bachetti, M;  Motta, SE;  Papitto, A;  Pilia, M;  Xie, F;  Bianchi, S;  Bobrikova, A;  Costa, E;  Deng, W;  Ge, MY;  Illiano, G;  Jia, SM;  Krawczynski, H;  Lai, EV;  Liu, K;  Mastroserio, G;  Muleri, F;  Rankin, J;  Soffitta, P;  Veledina, A;  Ambrosino, F;  Del Santo, M;  Chen, W;  Garcia, JA;  Kaaret, P;  Russell, TD;  Wei, WH;  Zhang, SN;  Zuo, C;  Arzoumanian, Z;  Cocchi, M;  Gnarini, A;  Farinelli, R;  Gendreau, K;  Ursini, F;  Weisskopf, MC;  Zane, S;  Agudo, I;  Antonelli, LA;  Baldini, L;  Baumgartner, WH;  Bellazzini, R;  Bongiorno, SD;  Bonino, R;  Brez, A;  Bucciantini, N;  Capitanio, F;  Castellano, S;  Cavazzuti, E;  Chen, CT;  Ciprini, S;  De Rosa, A;  Del Monte, E;  Di Gesu, L;  Di Lalla, N;  Donnarumma, I;  Doroshenko, V;  Dovčiak, M;  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;  Latronico, L;  Liodakis, I;  Maldera, S;  Manfreda, A;  Marin, F;  Marinucci, A;  Marscher, AP;  Marshall, HL;  Massaro, F;  Matt, G;  Mitsuishi, I;  Mizuno, T;  Negro, M;  Ng, CY;  O’Dell, SL;  Omodei, N;  Oppedisano, C;  Pavlov, GG;  Peirson, AL;  Perri, M;  Pesce-Rollins, M;  Petrucci, PO;  Possenti, A;  Puccetti, S;  Ramsey, BD;   - view fewer <#>    (2024)    Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1.                   The Astrophysical Journal Letters , 960  (2)    , Article L11.  10.3847/2041-8213/ad132d <https://doi.org/10.3847/2041-8213%2Fad132d>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10186104/1/La_Monaca_2024_ApJL_960_L11.pdf