Detailed dust modelling in the L-Galaxies semi-analytic model of galaxy formation

Vijayan, Aswin P, Clay, Scott J, Thomas, Peter A, Yates, Robert M, Wilkins, Stephen M and Henriques, Bruno M (2019) Detailed dust modelling in the L-Galaxies semi-analytic model of galaxy formation. Monthly Notices Of The Royal Astronomical Society, 489 (3). pp. 4072-4089. ISSN 0035-8711

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We 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.

Item Type: Article
Keywords: galaxies: formation – galaxies: evolution – galaxies: ISM – ISM: dust, extinction – methods: analytical
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Amelia Redman
Date Deposited: 21 Aug 2019 12:24
Last Modified: 22 Nov 2019 13:15

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