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Detailed dust modelling in the L-Galaxies semi-analytic model of galaxy formation
journal contribution
posted on 2023-06-09, 18:42 authored by Aswin P Vijayan, Scott J Clay, Peter ThomasPeter Thomas, Robert M Yates, Stephen WilkinsStephen Wilkins, Bruno M HenriquesWe implement a detailed dust model into the L-Galaxies semi-analytical model which includes: injection of dust by type II and type Ia supernovae (SNe) and AGB stars; grain growth in molecular clouds; and destruction due to supernova-induced shocks, star formation, and reheating. Our grain growth model follows the dust content in molecular clouds and the inter-cloud medium separately, and allows growth only on pre-existing dust grains. At early times, this can make a significant difference to the dust growth rate. Above z ~ 8, type II SNe are the primary source of dust, whereas below z ~ 8, grain growth in molecular clouds dominates, with the total dust content being dominated by the latter below z ~ 6. However, the detailed history of galaxy formation is important for determining the dust content of any individual galaxy. We introduce a fit to the dust-to-metal (DTM) ratio as a function of metallicity and age, which can be used to deduce the DTM ratio of galaxies at any redshift. At z ? 3, we find a fairly flat mean relation between metallicity and the DTM, and a positive correlation between metallicity and the dust-to-gas (DTG) ratio, in good agreement with the shape and normalisation of the observed relations. We also match the normalisation of the observed stellar mass – dust mass relation over the redshift range of 0 - 4, and to the dust mass function at z = 0. Our results are important in interpreting observations on the dust content of galaxies across cosmic time, particularly so at high redshift.
History
Publication status
- Published
File Version
- Accepted version
Journal
Monthly Notices Of The Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
3Volume
489Page range
4072-4089Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-08-21First Open Access (FOA) Date
2019-08-21First Compliant Deposit (FCD) Date
2019-08-20Usage metrics
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