Field spheroid-dominated galaxies in a Λ-CDM Universe

M. S. Rosito, S. E. Pedrosa, P. B. Tissera, V. Avila-Reese, I. Lacerna, L. A. Bignone, H. J. Ibarra-Medel, S. Varela

Resultado de la investigación: Article

3 Citas (Scopus)

Resumen

Context. Understanding the formation and evolution of early-type, spheroid-dominated galaxies is an open question within the context of the hierarchical clustering scenario, particularly in low-density environments. Aims. Our goal is to study the main structural, dynamical, and stellar population properties and assembly histories of field spheroid-dominated galaxies formed in a Λ-cold dark matter (Λ-CDM) scenario to assess to what extent they are consistent with observations. Methods. We selected spheroid-dominated systems from a Λ-CDM simulation that includes star formation (SF), chemical evolution, and supernova feedback. The sample is made up of 18 field systems with MStar ≤ 6 × 1010M that are dominated by the spheroid component. For this sample we estimated the fundamental relations of ellipticals and compared them with current observations. Results. The simulated spheroid galaxies have sizes that are in good agreement with observations. The bulges follow a Sersic law with Sersic indexes that correlate with the bulge-to-total mass ratios. The structural-dynamical properties of the simulated galaxies are consistent with observed Faber-Jackson, fundamental plane, and Tully-Fisher relations. However, the simulated galaxies are bluer and with higher star formation rates (SFRs) than the observed isolated early-type galaxies. The archaeological mass growth histories show a slightly delayed formation and more prominent inside-out growth mode than observational inferences based on the fossil record method. Conclusions. The main structural and dynamical properties of the simulated spheroid-dominated galaxies are consistent with observations. This is remarkable since our simulation has not been calibrated to match them. However, the simulated galaxies are blue and star-forming, and with later stellar mass growth histories compared to observational inferences. This is mainly due to the persistence of extended discs in the simulations. The need for more efficient quenching mechanisms able to avoid further disc growth and SF is required in order to reproduce current observational trends.

Idioma originalEnglish
Número de artículoA85
PublicaciónAstronomy and Astrophysics
Volumen614
DOI
EstadoPublished - 1 jun 2018

Huella dactilar

spheroids
universe
galaxies
history
simulation
histories
inference
fossil record
star formation
persistence
Tully-Fisher relation
chemical evolution
fossils
star formation rate
stellar mass
mass ratios
supernovae
dark matter
assembly
quenching

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Rosito, M. S., Pedrosa, S. E., Tissera, P. B., Avila-Reese, V., Lacerna, I., Bignone, L. A., ... Varela, S. (2018). Field spheroid-dominated galaxies in a Λ-CDM Universe. Astronomy and Astrophysics, 614, [A85]. https://doi.org/10.1051/0004-6361/201732302
Rosito, M. S. ; Pedrosa, S. E. ; Tissera, P. B. ; Avila-Reese, V. ; Lacerna, I. ; Bignone, L. A. ; Ibarra-Medel, H. J. ; Varela, S. / Field spheroid-dominated galaxies in a Λ-CDM Universe. En: Astronomy and Astrophysics. 2018 ; Vol. 614.
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abstract = "Context. Understanding the formation and evolution of early-type, spheroid-dominated galaxies is an open question within the context of the hierarchical clustering scenario, particularly in low-density environments. Aims. Our goal is to study the main structural, dynamical, and stellar population properties and assembly histories of field spheroid-dominated galaxies formed in a Λ-cold dark matter (Λ-CDM) scenario to assess to what extent they are consistent with observations. Methods. We selected spheroid-dominated systems from a Λ-CDM simulation that includes star formation (SF), chemical evolution, and supernova feedback. The sample is made up of 18 field systems with MStar ≤ 6 × 1010M⊙ that are dominated by the spheroid component. For this sample we estimated the fundamental relations of ellipticals and compared them with current observations. Results. The simulated spheroid galaxies have sizes that are in good agreement with observations. The bulges follow a Sersic law with Sersic indexes that correlate with the bulge-to-total mass ratios. The structural-dynamical properties of the simulated galaxies are consistent with observed Faber-Jackson, fundamental plane, and Tully-Fisher relations. However, the simulated galaxies are bluer and with higher star formation rates (SFRs) than the observed isolated early-type galaxies. The archaeological mass growth histories show a slightly delayed formation and more prominent inside-out growth mode than observational inferences based on the fossil record method. Conclusions. The main structural and dynamical properties of the simulated spheroid-dominated galaxies are consistent with observations. This is remarkable since our simulation has not been calibrated to match them. However, the simulated galaxies are blue and star-forming, and with later stellar mass growth histories compared to observational inferences. This is mainly due to the persistence of extended discs in the simulations. The need for more efficient quenching mechanisms able to avoid further disc growth and SF is required in order to reproduce current observational trends.",
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Rosito, MS, Pedrosa, SE, Tissera, PB, Avila-Reese, V, Lacerna, I, Bignone, LA, Ibarra-Medel, HJ & Varela, S 2018, 'Field spheroid-dominated galaxies in a Λ-CDM Universe', Astronomy and Astrophysics, vol. 614, A85. https://doi.org/10.1051/0004-6361/201732302

Field spheroid-dominated galaxies in a Λ-CDM Universe. / Rosito, M. S.; Pedrosa, S. E.; Tissera, P. B.; Avila-Reese, V.; Lacerna, I.; Bignone, L. A.; Ibarra-Medel, H. J.; Varela, S.

En: Astronomy and Astrophysics, Vol. 614, A85, 01.06.2018.

Resultado de la investigación: Article

TY - JOUR

T1 - Field spheroid-dominated galaxies in a Λ-CDM Universe

AU - Rosito, M. S.

AU - Pedrosa, S. E.

AU - Tissera, P. B.

AU - Avila-Reese, V.

AU - Lacerna, I.

AU - Bignone, L. A.

AU - Ibarra-Medel, H. J.

AU - Varela, S.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Context. Understanding the formation and evolution of early-type, spheroid-dominated galaxies is an open question within the context of the hierarchical clustering scenario, particularly in low-density environments. Aims. Our goal is to study the main structural, dynamical, and stellar population properties and assembly histories of field spheroid-dominated galaxies formed in a Λ-cold dark matter (Λ-CDM) scenario to assess to what extent they are consistent with observations. Methods. We selected spheroid-dominated systems from a Λ-CDM simulation that includes star formation (SF), chemical evolution, and supernova feedback. The sample is made up of 18 field systems with MStar ≤ 6 × 1010M⊙ that are dominated by the spheroid component. For this sample we estimated the fundamental relations of ellipticals and compared them with current observations. Results. The simulated spheroid galaxies have sizes that are in good agreement with observations. The bulges follow a Sersic law with Sersic indexes that correlate with the bulge-to-total mass ratios. The structural-dynamical properties of the simulated galaxies are consistent with observed Faber-Jackson, fundamental plane, and Tully-Fisher relations. However, the simulated galaxies are bluer and with higher star formation rates (SFRs) than the observed isolated early-type galaxies. The archaeological mass growth histories show a slightly delayed formation and more prominent inside-out growth mode than observational inferences based on the fossil record method. Conclusions. The main structural and dynamical properties of the simulated spheroid-dominated galaxies are consistent with observations. This is remarkable since our simulation has not been calibrated to match them. However, the simulated galaxies are blue and star-forming, and with later stellar mass growth histories compared to observational inferences. This is mainly due to the persistence of extended discs in the simulations. The need for more efficient quenching mechanisms able to avoid further disc growth and SF is required in order to reproduce current observational trends.

AB - Context. Understanding the formation and evolution of early-type, spheroid-dominated galaxies is an open question within the context of the hierarchical clustering scenario, particularly in low-density environments. Aims. Our goal is to study the main structural, dynamical, and stellar population properties and assembly histories of field spheroid-dominated galaxies formed in a Λ-cold dark matter (Λ-CDM) scenario to assess to what extent they are consistent with observations. Methods. We selected spheroid-dominated systems from a Λ-CDM simulation that includes star formation (SF), chemical evolution, and supernova feedback. The sample is made up of 18 field systems with MStar ≤ 6 × 1010M⊙ that are dominated by the spheroid component. For this sample we estimated the fundamental relations of ellipticals and compared them with current observations. Results. The simulated spheroid galaxies have sizes that are in good agreement with observations. The bulges follow a Sersic law with Sersic indexes that correlate with the bulge-to-total mass ratios. The structural-dynamical properties of the simulated galaxies are consistent with observed Faber-Jackson, fundamental plane, and Tully-Fisher relations. However, the simulated galaxies are bluer and with higher star formation rates (SFRs) than the observed isolated early-type galaxies. The archaeological mass growth histories show a slightly delayed formation and more prominent inside-out growth mode than observational inferences based on the fossil record method. Conclusions. The main structural and dynamical properties of the simulated spheroid-dominated galaxies are consistent with observations. This is remarkable since our simulation has not been calibrated to match them. However, the simulated galaxies are blue and star-forming, and with later stellar mass growth histories compared to observational inferences. This is mainly due to the persistence of extended discs in the simulations. The need for more efficient quenching mechanisms able to avoid further disc growth and SF is required in order to reproduce current observational trends.

KW - Galaxies: elliptical and lenticular, cD

KW - Galaxies: formation

KW - Galaxies: fundamental parameters

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Rosito MS, Pedrosa SE, Tissera PB, Avila-Reese V, Lacerna I, Bignone LA y otros. Field spheroid-dominated galaxies in a Λ-CDM Universe. Astronomy and Astrophysics. 2018 jun 1;614. A85. https://doi.org/10.1051/0004-6361/201732302