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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.21238 |
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| _version_ | 1866912354464169984 |
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| author | Yamauchi, Shigeo Ueno, Masaru |
| author_facet | Yamauchi, Shigeo Ueno, Masaru |
| contents | AX J145732-5901 is an unidentified X-ray source discovered in the ASCA Galactic plane survey. Its extended nature and heavily absorbed X-ray spectrum suggest that AX J145732-5901 is a cluster of galaxies behind the Galactic plane. However, due to limited photon statistics, the spectral shape was not well examined. Using the results of the Galactic ridge X-ray emission and Cosmic X-ray background studies based on the Suzaku observations, we reanalyzed the ASCA data of AX J145732-5901. We confirmed that the source is more extended than the point spread function and the angular size is 14'x10'. The spectrum was heavily absorbed by interstellar matter equivalent to an N_{H} of ~10^{23} cm^{-2} and the emission line feature was confirmed. The spectrum was represented by a thin thermal plasma model with a temperature of 2.6 keV and a redshift of 0.12. Assuming the redshift value, the X-ray luminosity is calculated to be 2.6x10^{44} erg s^{-1} in the 1-10 keV energy band. The observational results indicate that AX J145732-5901 is a cluster of galaxies behind the Galactic plane. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_21238 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A new candidate of a cluster of galaxies behind the Galactic plane, AX J145732-5901 Yamauchi, Shigeo Ueno, Masaru High Energy Astrophysical Phenomena AX J145732-5901 is an unidentified X-ray source discovered in the ASCA Galactic plane survey. Its extended nature and heavily absorbed X-ray spectrum suggest that AX J145732-5901 is a cluster of galaxies behind the Galactic plane. However, due to limited photon statistics, the spectral shape was not well examined. Using the results of the Galactic ridge X-ray emission and Cosmic X-ray background studies based on the Suzaku observations, we reanalyzed the ASCA data of AX J145732-5901. We confirmed that the source is more extended than the point spread function and the angular size is 14'x10'. The spectrum was heavily absorbed by interstellar matter equivalent to an N_{H} of ~10^{23} cm^{-2} and the emission line feature was confirmed. The spectrum was represented by a thin thermal plasma model with a temperature of 2.6 keV and a redshift of 0.12. Assuming the redshift value, the X-ray luminosity is calculated to be 2.6x10^{44} erg s^{-1} in the 1-10 keV energy band. The observational results indicate that AX J145732-5901 is a cluster of galaxies behind the Galactic plane. |
| title | A new candidate of a cluster of galaxies behind the Galactic plane, AX J145732-5901 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.21238 |