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  Galaxy formation with L-GALAXIES: modelling the environmental dependency of galaxy evolution and comparing with observations

Ayromlou, M., Kauffmann, G., Yates, R. M., Nelson, D., & White, S. D. M. (2021). Galaxy formation with L-GALAXIES: modelling the environmental dependency of galaxy evolution and comparing with observations. Monthly Notices of the Royal Astronomical Society, 505(1), 492-514. doi:10.1093/mnras/stab1245.

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Ayromlou, Mohammadreza1, Author              
Kauffmann, Guinevere1, Author              
Yates, Robert M.2, Author              
Nelson, Dylan1, Author              
White, Simon D. M.2, Author              
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1Galaxy Formation, MPI for Astrophysics, Max Planck Society, ou_2205643              
2Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              

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 Abstract: We present a variation of the recently updated Munich semi-analytical galaxy formation model, L-Galaxies, with a new gas stripping method. Extending earlier work, we directly measure the local environmental properties of galaxies to formulate a more accurate treatment of ram-pressure stripping for all galaxies. We fully recalibrate the modified L-Galaxies model using a Markov Chain Monte Carlo (MCMC) method with the stellar mass function and quenched fraction of galaxies as a function of stellar mass at 0 ≤ z ≤ 2 as constraints. Due to this recalibration, global galaxy population relations, including the stellar mass function, quenched fractions versus galaxy mass, and H i mass function are all largely unchanged and remain consistent with observations. By comparing to data on galaxy properties in different environments from the SDSS and HSC surveys, we demonstrate that our modified model improves the agreement with the quenched fractions and star formation rates of galaxies as a function of environment, stellar mass, and redshift. Overall, in the vicinity of haloes with total mass 1012 to 1015M at z = 0, our new model produces higher quenched fractions and stronger environmental dependencies, better recovering observed trends with halocentric distance up to several virial radii. By analysing the actual amount of gas stripped from galaxies in our model, we show that those in the vicinity of massive haloes lose a large fraction of their hot halo gas before they become satellites. We demonstrate that this affects galaxy quenching both within and beyond the halo boundary. This is likely to influence the correlations between galaxies up to tens of megaparsecs.

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Language(s): eng - English
 Dates: 2021-05-07
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab1245
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Title: Monthly Notices of the Royal Astronomical Society
  Abbreviation : Mon. Not. Roy. Astron. Soc.
Source Genre: Journal
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Pages: - Volume / Issue: 505 (1) Sequence Number: - Start / End Page: 492 - 514 Identifier: ISSN: 0035-8711
ISSN: 1365-8711