Dust enrichment in the circum-galactic medium

ABSTRACT To understand the origin of dust in the circum-galactic medium (CGM), we develop a dust enrichment model. We describe each of the central galaxy and its CGM as a single zone, and consider the mass exchange between them through galactic inflows and outflows. We calculate the evolution of the...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2024-03, Vol.528 (3), p.5008-5018
Hauptverfasser: Otsuki, Mau, Hirashita, Hiroyuki
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Hirashita, Hiroyuki
description ABSTRACT To understand the origin of dust in the circum-galactic medium (CGM), we develop a dust enrichment model. We describe each of the central galaxy and its CGM as a single zone, and consider the mass exchange between them through galactic inflows and outflows. We calculate the evolution of the gas, metal, and dust masses in the galaxy and the CGM. In the galaxy, we include stellar dust production and interstellar dust processing following our previous models. The dust in the galaxy is transported to the CGM via galactic outflows, and it is further processed by dust destruction (sputtering) in the CGM. We parametrize the time-scale or efficiency of each process and investigate the effect on the dust abundance in the CGM. We find that the resulting dust mass is sensitive to the dust destruction in the CGM, and the dust supply from galactic outflows, both of which directly regulate the dust abundance in the CGM. The inflow time-scale also affects the dust abundance in the CGM because it determines the gas mass evolution (thus, the star formation history) in the galaxy. The dust abundance in the CGM, however, is insensitive to stellar dust formation in the galaxy at later epochs because the dust production is dominated by dust growth in the interstellar medium. We also find that the resulting dust mass in the CGM is consistent with the value derived from a large sample of SDSS galaxies.
doi_str_mv 10.1093/mnras/stae342
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subjects Abundance
Astronomical models
Cosmic dust
Dust
Galactic evolution
Galaxies
Inflow
Interstellar gas
Interstellar matter
Outflow
Star & galaxy formation
Star formation
title Dust enrichment in the circum-galactic medium
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