| Title: |
Insights into the broadband emission of the TeV blazar Mrk 501 during the first X-ray polarization measurements |
| Authors: |
MAGIC Collaboration; Arbet Engels, A.; Paneque, David; Aguasca-Cabot, Arnau; Carretero-Castrillo, M.; Paredes, Josep M.; Ribó, Marc; Agudo, Iván; Bernardos, M. I.; Castro-Tirado, Alberto J.; Escudero, Juan; López-Coto, Rubén; Campoy-Ordaz, A.; Font, L.; Gaug, Markus; Ubach, S.; Aceituno, Francisco José; Agís-González, B.; Casanova, Víctor; Fernández-Garcia, E.; García Comas, Maia; Hu, Youdong; Husillos, César; Sota Ballano, Alfredo |
| Contributors: |
Agencia Estatal de Investigación (España); Ministerio de Ciencia e Innovación (España); Generalitat de Catalunya; European Commission; NASA; European Space Agency; Consejo Superior de Investigaciones Científicas https://ror.org/02gfc7t72 |
| Publisher Information: |
EDP Sciences |
| Publication Year: |
2024 |
| Collection: |
Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| Subject Terms: |
Radiation mechanisms: non-thermal; Galaxies: active; BL Lacertae objects: individual: Markarian 501; Gamma rays: general; X-rays: galaxies |
| Description: |
MAGIC Collaboration at al. ; [Aims] We present the first multiwavelength study of Mrk 501 that contains simultaneous very-high-energy (VHE) γ-ray observations and X-ray polarization measurements from the Imaging X-ray Polarimetry Explorer (IXPE). ; [Methods] We used radio-to-VHE data from a multiwavelength campaign carried out between March 1, 2022, and July 19, 2022 (MJD 59639 to MJD 59779). The observations were performed by MAGIC, Fermi-LAT, NuSTAR, Swift (XRT and UVOT), and several other instruments that cover the optical and radio bands to complement the IXPE pointings. We characterized the dynamics of the broadband emission around the X-ray polarization measurements through its multiband fractional variability and correlations, and compared changes observed in the polarization degree to changes seen in the broadband emission using a multi-zone leptonic scenario. ; [Results] During the IXPE pointings, the VHE state is close to the average behavior, with a 0.2–1 TeV flux of 20%–50% of the emission of the Crab Nebula. Additionally, it shows low variability and a hint of correlation between VHE γ-rays and X-rays. Despite the average VHE activity, an extreme X-ray behavior is measured for the first two IXPE pointings, taken in March 2022 (MJD 59646 to 59648 and MJD 59665 to 59667), with a synchrotron peak frequency > 1 keV. For the third IXPE pointing, in July 2022 (MJD 59769 to 59772), the synchrotron peak shifts toward lower energies and the optical/X-ray polarization degrees drop. All three IXPE epochs show an atypically low Compton dominance in the γ-rays. The X-ray polarization is systematically higher than at lower energies, suggesting an energy stratification of the jet. While during the IXPE epochs the polarization angles in the X-ray, optical, and radio bands align well, we find a clear discrepancy in the optical and radio polarization angles in the middle of the campaign. Such results further support the hypothesis of an energy-stratified jet. We modeled broadband spectra taken simultaneous to the ... |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
#PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104114RB-C31/ES/ASTRONOMIA DE RAYOS GAMMA CON MAGIC Y CTA-NORTH, PROYECTO 1 - CONTRIBUCION DE CIEMAT/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104114RB-C32/ES/ASTRONOMIA DE RAYOS GAMMA CON MAGIC Y CTA-NORTE, PROYECTO 1 - CONTRIBUCION DE UCM-GAE/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104114RB-C33/ES/ASTRONOMIA DE RAYOS GAMMA CON MAGIC Y CTA-NORTE - CONTRIBUCION DE ICCUB/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-105510GB-C31/ES/FUENTES DE ALTA ENERGIA CON FLUJOS A DIFERENTES ESCALAS: TEORIA Y OBSERVACIONES/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107847RB-C41/ES/ASTRONOMIA DE RAYOS GAMMA CON MAGIC Y CTA-NORTE, PROYECTO 2 - CONTRIBUCION DEL IFAE/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107847RB-C42/ES/ASTRONOMIA DE RAYOS GAMMA CON MAGIC Y CTA-NORTE, PROYECTO 2 - CONTRIBUCION DE UAB&CERES-IEEC/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107847RB-C44/ES/ASTRONOMIA DE RAYOS GAMMA CON MAGIC Y CTA-NORTE - CONTRIBUCION DEL IAA-CSIC/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107988GB-C22/ES/PARTICIPACION DEL IAC EN EL EXPERIMENTO AMS/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/SEV-2016-0588; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2019- 000920-S; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2019-000918-M; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2021-001131-S; info:eu-repo/grantAgreement/AEI//MDM-2015-0509-18-2; info:eu-repo/grantAgreement/EC/HE/101040021; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-118491GB-I00/ES/DETECCION DE FENOMENOS TRANSITORIOS HACIENDO USO DE INSTRUMENTACION ROBOTICA CON ALTA RESOLUCION TEMPORAL/; The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1051/0004-6361/202348709; https://doi.org/10.1051/0004-6361/202348709; Sí; Astronomy & Astrophysics 685: A117 (2024); https://hdl.handle.net/10261/382091; http://dx.doi.org/10.13039/501100002809; http://dx.doi.org/10.13039/100000104; http://dx.doi.org/10.13039/501100011033; http://dx.doi.org/10.13039/501100000780; http://dx.doi.org/10.13039/501100000844; http://dx.doi.org/10.13039/501100004837 |
| DOI: |
10.1051/0004-6361/202348709 |
| DOI: |
10.13039/501100002809 |
| DOI: |
10.13039/100000104 |
| DOI: |
10.13039/501100011033 |
| DOI: |
10.13039/501100000780 |
| DOI: |
10.13039/501100000844 |
| DOI: |
10.13039/501100004837 |
| Availability: |
https://hdl.handle.net/10261/382091; https://doi.org/10.1051/0004-6361/202348709; https://doi.org/10.13039/501100002809; https://doi.org/10.13039/100000104; https://doi.org/10.13039/501100011033; https://doi.org/10.13039/501100000780; https://doi.org/10.13039/501100000844; https://doi.org/10.13039/501100004837 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.6950C6E5 |
| Database: |
BASE |