Extreme Values of Black Hole to Stellar Mass Ratio for High-Redshift Galaxies
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913000952168448 |
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| author | Heather, Cameron Chantavat, Teeraparb Chongchitnan, Siri Silk, Joseph |
| author_facet | Heather, Cameron Chantavat, Teeraparb Chongchitnan, Siri Silk, Joseph |
| contents | With recent data from the \emph{James Webb Space Telescope} (JWST), it is possible to calculate the mass of the supermassive black holes at the centre of galaxies, and the stellar mass of the host galaxies at $z \gtrsim 5$. In this work, we apply the method of extreme-value statistics to calculate the distributions of extreme black hole and stellar mass for the redshift range $3.5 \lesssim z \lesssim 8.5$. We sample these distributions to obtain a prediction for the black hole to stellar mass ratio of $\sim0.24$ over this redshift range, with the median in each bin varying in the range $0.18-0.35$. Our predictions are consistent with the highest observed values of the ratio from JWST observations of high-redshift galaxies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_02568 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Extreme Values of Black Hole to Stellar Mass Ratio for High-Redshift Galaxies Heather, Cameron Chantavat, Teeraparb Chongchitnan, Siri Silk, Joseph Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics With recent data from the \emph{James Webb Space Telescope} (JWST), it is possible to calculate the mass of the supermassive black holes at the centre of galaxies, and the stellar mass of the host galaxies at $z \gtrsim 5$. In this work, we apply the method of extreme-value statistics to calculate the distributions of extreme black hole and stellar mass for the redshift range $3.5 \lesssim z \lesssim 8.5$. We sample these distributions to obtain a prediction for the black hole to stellar mass ratio of $\sim0.24$ over this redshift range, with the median in each bin varying in the range $0.18-0.35$. Our predictions are consistent with the highest observed values of the ratio from JWST observations of high-redshift galaxies. |
| title | Extreme Values of Black Hole to Stellar Mass Ratio for High-Redshift Galaxies |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2604.02568 |