On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation

Cosmological hydrodynamical simulations are studied in order to analyse generic trends for the stellar, baryonic and halo mass assembly of low-mass galaxies (M* < 3 × 1010M⊙) as a function of their present halo mass, in the context of the λcold dark matter (λCDM) scenario and common subgrid p...

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Detalles Bibliográficos
Autores principales:	De Rossi, Maria Emilia, Tissera, Patricia Beatriz, Pedrosa, Susana Elizabeth
Publicado:	2013
Materias:	Cosmology: Theory Galaxies: Evolution Galaxies: Haloes Galaxies: Highredshift Galaxies: Star Formation Methods: Numerical
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v435_n3_p2736_DeRossi http://hdl.handle.net/20.500.12110/paper_00358711_v435_n3_p2736_DeRossi
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00358711_v435_n3_p2736_DeRossi
record_format	dspace
spelling	paper:paper_00358711_v435_n3_p2736_DeRossi2023-06-08T15:01:36Z On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation De Rossi, Maria Emilia Tissera, Patricia Beatriz Pedrosa, Susana Elizabeth Cosmology: Theory Galaxies: Evolution Galaxies: Haloes Galaxies: Highredshift Galaxies: Star Formation Methods: Numerical Cosmological hydrodynamical simulations are studied in order to analyse generic trends for the stellar, baryonic and halo mass assembly of low-mass galaxies (M* < 3 × 1010M⊙) as a function of their present halo mass, in the context of the λcold dark matter (λCDM) scenario and common subgrid physics schemes.We obtain that smaller galaxies exhibit higher specific star formation rates and higher gas fractions. Although these trends are in rough agreement with observations, the absolute values of these quantities tend to be lower than observed ones since z ~ 2. The simulated galaxy stellar mass fraction increases with halo mass, consistently with semi-empirical inferences. However, the predicted correlation between them shows negligible variations up to high z, while these inferences seem to indicate some evolution. The hot-gas mass in z = 0 haloes is higher than the central galaxy mass by a factor of ~1-1.5 and this factor increases up to ~5-7 at z ~ 2 for the smallest galaxies. The stellar, baryonic and halo evolutionary tracks of simulated galaxies show that smaller galaxies tend to delay their baryonic and stellar mass assembly with respect to the halo one. The supernova feedback treatment included in this model plays a key role on this behaviour albeit the trend is still weaker than the one inferred from observations. At z > 2, the overall properties of simulated galaxies are not in large disagreement with those derived from observations. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Fil:De Rossi, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tissera, P.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pedrosa, S.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v435_n3_p2736_DeRossi http://hdl.handle.net/20.500.12110/paper_00358711_v435_n3_p2736_DeRossi
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cosmology: Theory Galaxies: Evolution Galaxies: Haloes Galaxies: Highredshift Galaxies: Star Formation Methods: Numerical
spellingShingle	Cosmology: Theory Galaxies: Evolution Galaxies: Haloes Galaxies: Highredshift Galaxies: Star Formation Methods: Numerical De Rossi, Maria Emilia Tissera, Patricia Beatriz Pedrosa, Susana Elizabeth On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation
topic_facet	Cosmology: Theory Galaxies: Evolution Galaxies: Haloes Galaxies: Highredshift Galaxies: Star Formation Methods: Numerical
description	Cosmological hydrodynamical simulations are studied in order to analyse generic trends for the stellar, baryonic and halo mass assembly of low-mass galaxies (M* < 3 × 1010M⊙) as a function of their present halo mass, in the context of the λcold dark matter (λCDM) scenario and common subgrid physics schemes.We obtain that smaller galaxies exhibit higher specific star formation rates and higher gas fractions. Although these trends are in rough agreement with observations, the absolute values of these quantities tend to be lower than observed ones since z ~ 2. The simulated galaxy stellar mass fraction increases with halo mass, consistently with semi-empirical inferences. However, the predicted correlation between them shows negligible variations up to high z, while these inferences seem to indicate some evolution. The hot-gas mass in z = 0 haloes is higher than the central galaxy mass by a factor of ~1-1.5 and this factor increases up to ~5-7 at z ~ 2 for the smallest galaxies. The stellar, baryonic and halo evolutionary tracks of simulated galaxies show that smaller galaxies tend to delay their baryonic and stellar mass assembly with respect to the halo one. The supernova feedback treatment included in this model plays a key role on this behaviour albeit the trend is still weaker than the one inferred from observations. At z > 2, the overall properties of simulated galaxies are not in large disagreement with those derived from observations. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
author	De Rossi, Maria Emilia Tissera, Patricia Beatriz Pedrosa, Susana Elizabeth
author_facet	De Rossi, Maria Emilia Tissera, Patricia Beatriz Pedrosa, Susana Elizabeth
author_sort	De Rossi, Maria Emilia
title	On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation
title_short	On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation
title_full	On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation
title_fullStr	On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation
title_full_unstemmed	On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation
title_sort	on the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation
publishDate	2013
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v435_n3_p2736_DeRossi http://hdl.handle.net/20.500.12110/paper_00358711_v435_n3_p2736_DeRossi
work_keys_str_mv	AT derossimariaemilia onthemassassemblyoflowmassgalaxiesinhydrodynamicalsimulationsofstructureformation AT tisserapatriciabeatriz onthemassassemblyoflowmassgalaxiesinhydrodynamicalsimulationsofstructureformation AT pedrosasusanaelizabeth onthemassassemblyoflowmassgalaxiesinhydrodynamicalsimulationsofstructureformation
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On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation

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