The XMM-Newton Line Emission Analysis Program (X-LEAP) I: Emission Line Survey of O VII, O VIII, and Fe L-Shell Transitions
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| Format: | Preprint |
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2024
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| _version_ | 1866929257821765632 |
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| author | Pan, Zeyang Qu, Zhijie Bregman, Joel N. Liu, Jifeng |
| author_facet | Pan, Zeyang Qu, Zhijie Bregman, Joel N. Liu, Jifeng |
| contents | The XMM-Newton Line Emission Analysis Program (X-LEAP) is designed to study diffuse X-ray emissions from the Milky Way (MW) hot gas, as well as emissions from the foreground solar wind charge exchange (SWCX). This paper reports an all-sky survey of spectral feature intensities corresponding to the O VII, O VIII, and iron L-shell (Fe-L) emissions. These intensities are derived from 5418 selected XMM-Newton observations with long exposure times and minimal contamination from point or extended sources. For 90% of the measured intensities, the values are within $\approx$ 2-18 photons cm$^{-2}$ s$^{-1}$ sr$^{-1}$ (line unit; L.U.), $\approx$ 0-8 L.U., and $\approx$ 0-9 L.U., respectively. We report long-term variations in O VII and O VIII intensities over 22 years, closely correlating with the solar cycle and attributed to SWCX emissions. These variations contribute $\sim30\%$ and $\sim20\%$ to the observed intensities on average and peak at $\approx$ 4 L.U. and $\approx$ 1 L.U. during solar maxima. We also find evidence of short-term and spatial variations in SWCX, indicating the need for a more refined SWCX model in future studies. In addition, we present SWCX- and absorption-corrected all-sky maps for a better view of the MW hot gas emission. These maps show a gradual decrease in oxygen intensity moving away from the Galactic center and a concentration of Fe-L intensity in the Galactic bubbles and disk. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_17195 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The XMM-Newton Line Emission Analysis Program (X-LEAP) I: Emission Line Survey of O VII, O VIII, and Fe L-Shell Transitions Pan, Zeyang Qu, Zhijie Bregman, Joel N. Liu, Jifeng High Energy Astrophysical Phenomena Astrophysics of Galaxies The XMM-Newton Line Emission Analysis Program (X-LEAP) is designed to study diffuse X-ray emissions from the Milky Way (MW) hot gas, as well as emissions from the foreground solar wind charge exchange (SWCX). This paper reports an all-sky survey of spectral feature intensities corresponding to the O VII, O VIII, and iron L-shell (Fe-L) emissions. These intensities are derived from 5418 selected XMM-Newton observations with long exposure times and minimal contamination from point or extended sources. For 90% of the measured intensities, the values are within $\approx$ 2-18 photons cm$^{-2}$ s$^{-1}$ sr$^{-1}$ (line unit; L.U.), $\approx$ 0-8 L.U., and $\approx$ 0-9 L.U., respectively. We report long-term variations in O VII and O VIII intensities over 22 years, closely correlating with the solar cycle and attributed to SWCX emissions. These variations contribute $\sim30\%$ and $\sim20\%$ to the observed intensities on average and peak at $\approx$ 4 L.U. and $\approx$ 1 L.U. during solar maxima. We also find evidence of short-term and spatial variations in SWCX, indicating the need for a more refined SWCX model in future studies. In addition, we present SWCX- and absorption-corrected all-sky maps for a better view of the MW hot gas emission. These maps show a gradual decrease in oxygen intensity moving away from the Galactic center and a concentration of Fe-L intensity in the Galactic bubbles and disk. |
| title | The XMM-Newton Line Emission Analysis Program (X-LEAP) I: Emission Line Survey of O VII, O VIII, and Fe L-Shell Transitions |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.17195 |