The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite
We study the effect of different feedback prescriptions on the properties of the low redshift (z ≤ 1.6) Ly α forest using a selection of hydrodynamical simulations drawn from the Sherwood simulation suite. The simulations incorporate stellar feedback, AGN feedback and a simplified scheme for efficie...
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| Format: | Article |
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Oxford University Press
2017
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| Online Access: | https://eprints.nottingham.ac.uk/44068/ |
| _version_ | 1848796829572923392 |
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| author | Nasir, Fahad Bolton, James S. Viel, Matteo Kim, Tae-Sun |
| author_facet | Nasir, Fahad Bolton, James S. Viel, Matteo Kim, Tae-Sun |
| author_sort | Nasir, Fahad |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We study the effect of different feedback prescriptions on the properties of the low redshift (z ≤ 1.6) Ly α forest using a selection of hydrodynamical simulations drawn from the Sherwood simulation suite. The simulations incorporate stellar feedback, AGN feedback and a simplified scheme for efficiently modelling the low column density Lyα forest. We confirm a discrepancy remains between Cosmic Origins Spectrograph (COS) observations of the Lyα forest column density distribution function (CDDF) at z ≃ 0.1 for high column density systems (NHI > 1014 cm−2), as well as Lyα velocity widths that are too narrow compared to the COS data. Stellar or AGN feedback – as currently implemented in our simulations – have only a small effect on the CDDF and velocity width distribution. We conclude that resolving the discrepancy between the COS data and simulations requires an increase in the temperature of overdense gas with Δ = 4–40, either through additional HeII photo-heating at z > 2 or fine-tuned feedback that ejects overdense gas into the IGM at just the right temperature for it to still contribute significantly to the Lyα forest. Alternatively a larger, currently unresolved turbulent component to the line width could resolve the discrepancy. |
| first_indexed | 2025-11-14T19:54:12Z |
| format | Article |
| id | nottingham-44068 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:54:12Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-440682020-05-04T19:11:47Z https://eprints.nottingham.ac.uk/44068/ The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite Nasir, Fahad Bolton, James S. Viel, Matteo Kim, Tae-Sun We study the effect of different feedback prescriptions on the properties of the low redshift (z ≤ 1.6) Ly α forest using a selection of hydrodynamical simulations drawn from the Sherwood simulation suite. The simulations incorporate stellar feedback, AGN feedback and a simplified scheme for efficiently modelling the low column density Lyα forest. We confirm a discrepancy remains between Cosmic Origins Spectrograph (COS) observations of the Lyα forest column density distribution function (CDDF) at z ≃ 0.1 for high column density systems (NHI > 1014 cm−2), as well as Lyα velocity widths that are too narrow compared to the COS data. Stellar or AGN feedback – as currently implemented in our simulations – have only a small effect on the CDDF and velocity width distribution. We conclude that resolving the discrepancy between the COS data and simulations requires an increase in the temperature of overdense gas with Δ = 4–40, either through additional HeII photo-heating at z > 2 or fine-tuned feedback that ejects overdense gas into the IGM at just the right temperature for it to still contribute significantly to the Lyα forest. Alternatively a larger, currently unresolved turbulent component to the line width could resolve the discrepancy. Oxford University Press 2017-10-11 Article PeerReviewed Nasir, Fahad, Bolton, James S., Viel, Matteo and Kim, Tae-Sun (2017) The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite. Monthly Notices of the Royal Astronomical Society, 471 (1). pp. 1056-1059. ISSN 1365-2966 Numerical methods Intergalatic medium Quasars Absorption lines https://academic.oup.com/mnras/article/471/1/1056/3906606/The-effect-of-stellar-and-AGN-feedback-on-the-low doi:10.1093/mnras/stx1648 doi:10.1093/mnras/stx1648 |
| spellingShingle | Numerical methods Intergalatic medium Quasars Absorption lines Nasir, Fahad Bolton, James S. Viel, Matteo Kim, Tae-Sun The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite |
| title | The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite |
| title_full | The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite |
| title_fullStr | The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite |
| title_full_unstemmed | The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite |
| title_short | The effect of stellar and AGN feedback on the low redshift Lyman-α forest in the Sherwood simulation suite |
| title_sort | effect of stellar and agn feedback on the low redshift lyman-α forest in the sherwood simulation suite |
| topic | Numerical methods Intergalatic medium Quasars Absorption lines |
| url | https://eprints.nottingham.ac.uk/44068/ https://eprints.nottingham.ac.uk/44068/ https://eprints.nottingham.ac.uk/44068/ |