The physical nature of circumgalactic medium absorbers in SIMBA
dc.contributor.author | Appleby, Sarah | |
dc.contributor.author | Dave, Romeel | |
dc.contributor.author | Sorini, Daniele | |
dc.date.accessioned | 2023-03-28T10:51:11Z | |
dc.date.available | 2023-03-28T10:51:11Z | |
dc.date.issued | 2023 | |
dc.description.abstract | We study the nature of the low-redshift circumgalactic medium (CGM) in the SIMBA cosmological simulations as traced by ultraviolet absorption lines around galaxies in bins of stellar mass (M > 1010M) for star-forming, green valley and quenched galaxies at impact parameters r⊥ ≤ 1.25r200. We generate synthetic spectra for H I , Mg II , C II , Si III , C IV , and O VI , fit Voigt profiles to obtain line properties, and estimate the density, temperature, and metallicity of the absorbing gas. We find that CGM absorbers are most abundant around star-forming galaxies with M < 1011 M, while the abundance of green valley galaxies show similar behaviour to those of quenched galaxies, suggesting that the CGM ‘quenches’ before star formation ceases. H I absorbing gas exists across a broad range of cosmic phases [condensed gas, diffuse gas, hot halo gas, and Warm-Hot Intergalactic Medium (WHIM)], while essentially all low ionization metal absorption arises from condensed gas. O VI absorbers are split between hot halo gas and the WHIM. The fraction of collisionally ionized CGM absorbers is ∼ 25–55 per cent for C IV and ∼ 80–95 per cent for O VI , depending on stellar mass and impact parameter. In general, the highest column density absorption features for each ion arise from dense gas. Satellite gas, defined as that within 10r1/2,, contributes ∼ 3 per cent of overall H I absorption but∼ 30 per cent of Mg II absorption, with the fraction fromsatellites decreasing with increasing ion excitation energy. | en_US |
dc.identifier.citation | Appleby, S. et al. (2023). The physical nature of circumgalactic medium absorbers in SIMBA. Monthly Notices of the Royal Astronomical Society, 519(4), 5514–5535. https://doi.org/10.1093/mnras/stad025 | en_US |
dc.identifier.issn | 1365-2966 | |
dc.identifier.uri | https://doi.org/10.1093/mnras/stad025 | |
dc.identifier.uri | http://hdl.handle.net/10566/8682 | |
dc.language.iso | en | en_US |
dc.publisher | Oxford University Press | en_US |
dc.subject | Astronomy | en_US |
dc.subject | Physics | en_US |
dc.subject | Cosmology | en_US |
dc.subject | Galaxies | en_US |
dc.title | The physical nature of circumgalactic medium absorbers in SIMBA | en_US |
dc.type | Article | en_US |
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