Little evolution of dust emissivity in bright infrared galaxies from $2 < z < 6$
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arXiv
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| Format: | Preprint |
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2024
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| author | Ward, B. A. Eales, S. A. Ivison, R. J. Arumugam, V. |
| author_facet | Ward, B. A. Eales, S. A. Ivison, R. J. Arumugam, V. |
| contents | Variations in the dust emissivity index, $β$, within and between galaxies, are evidence that the chemistry and physics of dust must vary on large scales, although the nature of the physical and/or chemical variations is still unknown. In this paper we estimate values of $β$ and dust temperature for a sample of 109 dusty star-forming galaxies (DSFGs) over the range, $2 < z < 6$. We compare the results obtained with both an optically-thin model and a general opacity model, finding that our estimates of $β$ are similar between the models but our estimates of dust temperature are not. We find no evidence of a change in $β$ with redshift, with a median value of $β= 1.96$ for the optically-thin model with a confidence interval (16 - 84%) of 1.67 to 2.35 for the population. Using simulations, we estimate the measurement errors from our procedure and show that the variation of $β$ in the population results from intrinsic variations in the properties of the dust in DSFGs. At a fixed far-infrared luminosity, we find no evidence for a change in dust temperature, $T_\textrm{dust}$, with redshift. After allowing for the effects of correlated measurement errors, we find an inverse correlation between $β$ and $T_\textrm{dust}$ in DSFGs, for which there is also evidence in low-redshift galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_05182 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Little evolution of dust emissivity in bright infrared galaxies from $2 < z < 6$ Ward, B. A. Eales, S. A. Ivison, R. J. Arumugam, V. Astrophysics of Galaxies Variations in the dust emissivity index, $β$, within and between galaxies, are evidence that the chemistry and physics of dust must vary on large scales, although the nature of the physical and/or chemical variations is still unknown. In this paper we estimate values of $β$ and dust temperature for a sample of 109 dusty star-forming galaxies (DSFGs) over the range, $2 < z < 6$. We compare the results obtained with both an optically-thin model and a general opacity model, finding that our estimates of $β$ are similar between the models but our estimates of dust temperature are not. We find no evidence of a change in $β$ with redshift, with a median value of $β= 1.96$ for the optically-thin model with a confidence interval (16 - 84%) of 1.67 to 2.35 for the population. Using simulations, we estimate the measurement errors from our procedure and show that the variation of $β$ in the population results from intrinsic variations in the properties of the dust in DSFGs. At a fixed far-infrared luminosity, we find no evidence for a change in dust temperature, $T_\textrm{dust}$, with redshift. After allowing for the effects of correlated measurement errors, we find an inverse correlation between $β$ and $T_\textrm{dust}$ in DSFGs, for which there is also evidence in low-redshift galaxies. |
| title | Little evolution of dust emissivity in bright infrared galaxies from $2 < z < 6$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.05182 |