X-ray Halos of Early-Type Galaxies with AGN Feedback and Accretion from a Circumgalactic Medium: models and observations
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| Format: | Preprint |
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2025
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| _version_ | 1866915428699209728 |
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| author | Pellegrini, Silvia Ciotti, Luca Gan, Zhaoming Kim, Dong-Woo Ostriker, Jeremiah P. |
| author_facet | Pellegrini, Silvia Ciotti, Luca Gan, Zhaoming Kim, Dong-Woo Ostriker, Jeremiah P. |
| contents | The knowledge of the X-ray properties of the hot gas halos of early-type galaxies has significantly advanced in the past years, for large and homogeneously investigated samples. We compare these results with the X-ray properties of an exploratory set of gas evolution models in realistic early-type galaxies, produced with our high-resolution 2D hydrodynamical code MACER that includes AGN feedback and accretion from a circumgalactic medium. The model X-ray emission and absorption are integrated along the line of sight, to obtain maps of the surface brightness Sigma_X and temperature Tx. The X-ray diagnostics considered are the luminosity and average temperature for the whole galaxy (Lx and <Tx>) and within 5 optical effective radii (Lx5 and <Tx5>), and the circularized profiles Sigma_X(R) and Tx(R). The values for Lx, Lx5, <Tx>, and <Tx5> compare very well with those observed. The Sigma_X(R) and Tx(R) also present qualitative similarities with those of the representative galaxy NGC5129, and of ETGs with the most commonly observed shape for Tx(R): Sigma_X(R) matches the observed profile over many optical effective radii Re, and Tx(R) reproduces the characteristic bump that peaks at R=(1 - 3)Re. Inside the peak position, Tx(R) declines towards the center, but the explored models are systematically hotter by ~30%; possible explanations for this discrepancy are discussed. Interestingly, Sigma_X(R) and Tx(R) as large as observed outside of R~Re are reproduced only with significant accretion from a circumgalactic medium, highlighting its importance. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_03536 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | X-ray Halos of Early-Type Galaxies with AGN Feedback and Accretion from a Circumgalactic Medium: models and observations Pellegrini, Silvia Ciotti, Luca Gan, Zhaoming Kim, Dong-Woo Ostriker, Jeremiah P. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena The knowledge of the X-ray properties of the hot gas halos of early-type galaxies has significantly advanced in the past years, for large and homogeneously investigated samples. We compare these results with the X-ray properties of an exploratory set of gas evolution models in realistic early-type galaxies, produced with our high-resolution 2D hydrodynamical code MACER that includes AGN feedback and accretion from a circumgalactic medium. The model X-ray emission and absorption are integrated along the line of sight, to obtain maps of the surface brightness Sigma_X and temperature Tx. The X-ray diagnostics considered are the luminosity and average temperature for the whole galaxy (Lx and <Tx>) and within 5 optical effective radii (Lx5 and <Tx5>), and the circularized profiles Sigma_X(R) and Tx(R). The values for Lx, Lx5, <Tx>, and <Tx5> compare very well with those observed. The Sigma_X(R) and Tx(R) also present qualitative similarities with those of the representative galaxy NGC5129, and of ETGs with the most commonly observed shape for Tx(R): Sigma_X(R) matches the observed profile over many optical effective radii Re, and Tx(R) reproduces the characteristic bump that peaks at R=(1 - 3)Re. Inside the peak position, Tx(R) declines towards the center, but the explored models are systematically hotter by ~30%; possible explanations for this discrepancy are discussed. Interestingly, Sigma_X(R) and Tx(R) as large as observed outside of R~Re are reproduced only with significant accretion from a circumgalactic medium, highlighting its importance. |
| title | X-ray Halos of Early-Type Galaxies with AGN Feedback and Accretion from a Circumgalactic Medium: models and observations |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2508.03536 |