Fe XVIII-XXIV K beta Inner-shell Absorption Lines in the X-ray Spectra of Neutron Star and Black Hole Binaries with XRISM
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arXiv
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2025
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| author | Tsujimoto, Masahiro Miura, Daiki Yamaguchi, Hiroya Behar, Ehud Done, Chris Trigo, Maria Diaz Gunasekera, Chamani M. van Hoof, Peter A. M. Bianchi, Stefano Dehghanian, Maryam Ferland, Gary J. |
| author_facet | Tsujimoto, Masahiro Miura, Daiki Yamaguchi, Hiroya Behar, Ehud Done, Chris Trigo, Maria Diaz Gunasekera, Chamani M. van Hoof, Peter A. M. Bianchi, Stefano Dehghanian, Maryam Ferland, Gary J. |
| contents | The advent of the X-ray microcalorimeter spectrometer Resolve onboard the XRISM space telescope opened a new era for high-resolution X-ray spectroscopy of astrophysical plasmas. Many spectral features were newly detected, including the K alpha and K beta inner-shell transition lines of mildly ionized (F- to Li-like) Fe at 6-8 keV in the spectra of X-ray binaries and active galactic nuclei. The widely used atomic databases contain information on the K alpha but not K beta lines of these ions. We conducted the atomic structure calculation using FAC to derive the Fe K alpha and K beta lines and verified the result against ground experiments and other calculations of the Fe K alpha lines. We then implemented the Fe K beta lines in a radiative transfer code (cloudy) and compared the synthesized and observed spectra with XRISM. A reasonably good agreement was obtained between the observation and the ab initio calculations. This exemplifies the need to expand the atomic databases to interpret astrophysical spectra. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_12317 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fe XVIII-XXIV K beta Inner-shell Absorption Lines in the X-ray Spectra of Neutron Star and Black Hole Binaries with XRISM Tsujimoto, Masahiro Miura, Daiki Yamaguchi, Hiroya Behar, Ehud Done, Chris Trigo, Maria Diaz Gunasekera, Chamani M. van Hoof, Peter A. M. Bianchi, Stefano Dehghanian, Maryam Ferland, Gary J. High Energy Astrophysical Phenomena The advent of the X-ray microcalorimeter spectrometer Resolve onboard the XRISM space telescope opened a new era for high-resolution X-ray spectroscopy of astrophysical plasmas. Many spectral features were newly detected, including the K alpha and K beta inner-shell transition lines of mildly ionized (F- to Li-like) Fe at 6-8 keV in the spectra of X-ray binaries and active galactic nuclei. The widely used atomic databases contain information on the K alpha but not K beta lines of these ions. We conducted the atomic structure calculation using FAC to derive the Fe K alpha and K beta lines and verified the result against ground experiments and other calculations of the Fe K alpha lines. We then implemented the Fe K beta lines in a radiative transfer code (cloudy) and compared the synthesized and observed spectra with XRISM. A reasonably good agreement was obtained between the observation and the ab initio calculations. This exemplifies the need to expand the atomic databases to interpret astrophysical spectra. |
| title | Fe XVIII-XXIV K beta Inner-shell Absorption Lines in the X-ray Spectra of Neutron Star and Black Hole Binaries with XRISM |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2510.12317 |