Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124
We report the phase-resolved spectral results of the first Galactic pulsating ultraluminous X-ray source (PULX) Swift J0243.6+6124, modeling its 2017–2018 outburst peak using data collected by the Hard X-ray Modulation Telescope (Insight-HXMT). The broad energy coverage of Insight-HXMT allows us to...
| Main Authors: | , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2024-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ad24f8 |
| _version_ | 1797231790634565632 |
|---|---|
| author | Y. X. Xiao Y. J. Xu M. Y. Ge F. J. Lu S. N. Zhang S. Zhang L. Tao J. L. Qu P. J. Wang L. D. Kong Y. L. Tuo Y. You S. J. Zhao J. Q. Peng Y. F. Du Y. H. Zhang W. T. Ye |
| author_facet | Y. X. Xiao Y. J. Xu M. Y. Ge F. J. Lu S. N. Zhang S. Zhang L. Tao J. L. Qu P. J. Wang L. D. Kong Y. L. Tuo Y. You S. J. Zhao J. Q. Peng Y. F. Du Y. H. Zhang W. T. Ye |
| author_sort | Y. X. Xiao |
| collection | DOAJ |
| description | We report the phase-resolved spectral results of the first Galactic pulsating ultraluminous X-ray source (PULX) Swift J0243.6+6124, modeling its 2017–2018 outburst peak using data collected by the Hard X-ray Modulation Telescope (Insight-HXMT). The broad energy coverage of Insight-HXMT allows us to obtain a more accurate spectral continuum to reduce the coupling of broad iron line profiles with other components. We use three different continuum spectrum models but obtain similar iron line results. For the first time, we detect the pulse characteristics of the broad iron line in a PULX. The variation in the width and intensity of this iron line with σ ∼ 1.2–1.5 keV has a phase offset of about 0.25 from the pulse phase. We suggest that the uneven irradiation of the thick inner disk by the accretion column produces the modulated variation of the broad iron line. In addition, the nonpulsed narrow line is suggested to come from the outer disk region. |
| first_indexed | 2024-04-24T15:49:59Z |
| format | Article |
| id | doaj.art-207301a8b77c471a8c3a45ee824a2e7a |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T15:49:59Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-207301a8b77c471a8c3a45ee824a2e7a2024-04-01T12:13:59ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0196511810.3847/1538-4357/ad24f8Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124Y. X. Xiao0https://orcid.org/0000-0002-1916-2494Y. J. Xu1M. Y. Ge2https://orcid.org/0000-0002-2749-6638F. J. Lu3https://orcid.org/0000-0003-3248-6087S. N. Zhang4https://orcid.org/0000-0001-5586-1017S. Zhang5L. Tao6https://orcid.org/0000-0002-2705-4338J. L. Qu7https://orcid.org/0000-0002-9796-2585P. J. Wang8https://orcid.org/0000-0002-6454-9540L. D. Kong9https://orcid.org/0000-0003-3188-9079Y. L. Tuo10Y. You11https://orcid.org/0000-0002-0352-8148S. J. Zhao12J. Q. Peng13https://orcid.org/0000-0002-5554-1088Y. F. Du14Y. H. Zhang15W. T. Ye16Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cnKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cnKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; Key Laboratory of Stellar and Interstellar Physics and School of Physics and Optoelectronics, Xiangtan University , Xiangtan 411105, Hunan, People's Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cnKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cnKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cnKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaInstitut für Astronomie und Astrophysik , Sand 1, 72076 Tübingen, GermanyInstitut für Astronomie und Astrophysik , Sand 1, 72076 Tübingen, GermanyKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cnKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; xuyj@ihep.ac.cn; University of Chinese Academy of Sciences , Chinese Academy of Sciences, Beijing 100049, People's Republic of ChinaWe report the phase-resolved spectral results of the first Galactic pulsating ultraluminous X-ray source (PULX) Swift J0243.6+6124, modeling its 2017–2018 outburst peak using data collected by the Hard X-ray Modulation Telescope (Insight-HXMT). The broad energy coverage of Insight-HXMT allows us to obtain a more accurate spectral continuum to reduce the coupling of broad iron line profiles with other components. We use three different continuum spectrum models but obtain similar iron line results. For the first time, we detect the pulse characteristics of the broad iron line in a PULX. The variation in the width and intensity of this iron line with σ ∼ 1.2–1.5 keV has a phase offset of about 0.25 from the pulse phase. We suggest that the uneven irradiation of the thick inner disk by the accretion column produces the modulated variation of the broad iron line. In addition, the nonpulsed narrow line is suggested to come from the outer disk region.https://doi.org/10.3847/1538-4357/ad24f8Binary pulsarsHigh mass x-ray binary starsX-ray binary starsUltraluminous x-ray sources |
| spellingShingle | Y. X. Xiao Y. J. Xu M. Y. Ge F. J. Lu S. N. Zhang S. Zhang L. Tao J. L. Qu P. J. Wang L. D. Kong Y. L. Tuo Y. You S. J. Zhao J. Q. Peng Y. F. Du Y. H. Zhang W. T. Ye Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124 The Astrophysical Journal Binary pulsars High mass x-ray binary stars X-ray binary stars Ultraluminous x-ray sources |
| title | Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124 |
| title_full | Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124 |
| title_fullStr | Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124 |
| title_full_unstemmed | Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124 |
| title_short | Pulsed Iron Line Emission from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124 |
| title_sort | pulsed iron line emission from the first galactic ultraluminous x ray pulsar swift j0243 6 6124 |
| topic | Binary pulsars High mass x-ray binary stars X-ray binary stars Ultraluminous x-ray sources |
| url | https://doi.org/10.3847/1538-4357/ad24f8 |
| work_keys_str_mv | AT yxxiao pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT yjxu pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT myge pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT fjlu pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT snzhang pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT szhang pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT ltao pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT jlqu pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT pjwang pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT ldkong pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT yltuo pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT yyou pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT sjzhao pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT jqpeng pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT yfdu pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT yhzhang pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 AT wtye pulsedironlineemissionfromthefirstgalacticultraluminousxraypulsarswiftj024366124 |