A Chandra Search for Periodic X-ray Sources in the Bulge of M31
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916223716950016 |
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| author | Zhang, Jiachang Bao, Tong Li, Zhiyuan |
| author_facet | Zhang, Jiachang Bao, Tong Li, Zhiyuan |
| contents | We present a systematic search for periodic X-ray sources in the bulge of M31, using ~ 2 Ms of archival Chandra observations spanning a temporal baseline of 16 years. Utilizing the Gregory-Loredo algorithm that is designed for photon-counting, phase-folded light curves, we detect seven periodic X-ray sources, among which four are newly discovered. Three of these sources are novae, the identified periods of which range between 1.3-2.0 hour and is most likely the orbital period. The other four sources are low-mass X-ray binaries, the identified periods of which range between 0.13-19.3 hour and are also likely orbital due to a clear eclipsing/dipping behavior in the light curve. We address implications on the X-ray binary population of the M31 bulge. Our study demonstrates the potential of using archival X-ray observations to systematically identify periodic X-ray sources in external galaxies, which would provide valuable information about the underlying exotic stellar populations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07432 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Chandra Search for Periodic X-ray Sources in the Bulge of M31 Zhang, Jiachang Bao, Tong Li, Zhiyuan High Energy Astrophysical Phenomena Astrophysics of Galaxies We present a systematic search for periodic X-ray sources in the bulge of M31, using ~ 2 Ms of archival Chandra observations spanning a temporal baseline of 16 years. Utilizing the Gregory-Loredo algorithm that is designed for photon-counting, phase-folded light curves, we detect seven periodic X-ray sources, among which four are newly discovered. Three of these sources are novae, the identified periods of which range between 1.3-2.0 hour and is most likely the orbital period. The other four sources are low-mass X-ray binaries, the identified periods of which range between 0.13-19.3 hour and are also likely orbital due to a clear eclipsing/dipping behavior in the light curve. We address implications on the X-ray binary population of the M31 bulge. Our study demonstrates the potential of using archival X-ray observations to systematically identify periodic X-ray sources in external galaxies, which would provide valuable information about the underlying exotic stellar populations. |
| title | A Chandra Search for Periodic X-ray Sources in the Bulge of M31 |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.07432 |