TY - JOUR
T1 - Formation of elongated galaxies with low masses at high redshift
AU - Ceverino, Daniel
AU - Primack, Joel
AU - Dekel, Avishai
N1 - Publisher Copyright:
© 2015 The Authors.
PY - 2015/7/24
Y1 - 2015/7/24
N2 - We report the identification of elongated (triaxial or prolate) galaxies in cosmological simulations at z ≃ 2. These are preferentially low-mass galaxies (M* ≤ 109.5 M⊙), residing in dark matter (DM) haloes with strongly elongated inner parts, a common feature of high-redshift DM haloes in the {n-ary logical and} cold dark matter cosmology. Feedback slows formation of stars at the centres of these haloes, so that a dominant and prolate DM distribution gives rise to galaxies elongated along the DM major axis. As galaxies grow in stellar mass, stars dominate the total mass within the galaxy half-mass radius, making stars and DM rounder and more oblate. A large population of elongated galaxies produces a very asymmetric distribution of projected axis ratios, as observed in high-z galaxy surveys. This indicates that themajority of the galaxies at high redshifts are not discs or spheroids but rather galaxies with elongated morphologies.
AB - We report the identification of elongated (triaxial or prolate) galaxies in cosmological simulations at z ≃ 2. These are preferentially low-mass galaxies (M* ≤ 109.5 M⊙), residing in dark matter (DM) haloes with strongly elongated inner parts, a common feature of high-redshift DM haloes in the {n-ary logical and} cold dark matter cosmology. Feedback slows formation of stars at the centres of these haloes, so that a dominant and prolate DM distribution gives rise to galaxies elongated along the DM major axis. As galaxies grow in stellar mass, stars dominate the total mass within the galaxy half-mass radius, making stars and DM rounder and more oblate. A large population of elongated galaxies produces a very asymmetric distribution of projected axis ratios, as observed in high-z galaxy surveys. This indicates that themajority of the galaxies at high redshifts are not discs or spheroids but rather galaxies with elongated morphologies.
KW - Galaxies: evolution
KW - Galaxies: formation
UR - http://www.scopus.com/inward/record.url?scp=84942792780&partnerID=8YFLogxK
U2 - 10.1093/mnras/stv1603
DO - 10.1093/mnras/stv1603
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AN - SCOPUS:84942792780
SN - 0035-8711
VL - 453
SP - 408
EP - 413
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -