The evolution of the gas fraction of quiescent galaxies modeled as a consequence of their creation rate
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The evolution of the gas fraction of quiescent galaxies modeled as a consequence of their creation rate. / Gobat, R.; Magdis, G.; D'Eugenio, C.; Valentino, F.
In: Astronomy & Astrophysics, Vol. 644, L7, 09.12.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The evolution of the gas fraction of quiescent galaxies modeled as a consequence of their creation rate
AU - Gobat, R.
AU - Magdis, G.
AU - D'Eugenio, C.
AU - Valentino, F.
PY - 2020/12/9
Y1 - 2020/12/9
N2 - We discuss the evolution of the interstellar medium of quiescent galaxies, currently emerging from recent analyses, with the help of a simple model based on well-established empirical relations such as the stellar mass functions and the main sequence of star formation. This model is meant to describe observed quantities without making specific assumptions on the nature of quenching processes, but relying on their observable consequences. We find that the high gas fractions seen or suggested at high redshift in quiescent galaxies, and their apparent mild evolution at early times, can be mostly attributed to a progenitor effect where recently quenched galaxies with similar to 10% gas fractions dominate the quiescent galaxy population until z similar to 1. In the same context, the much lower gas and dust fractions measured in local early-type galaxies are interpreted as the product of the steady depletion of their interstellar medium on a similar to 2 Gyr timescale, coupled with a higher fraction of more gas-exhaustive events.
AB - We discuss the evolution of the interstellar medium of quiescent galaxies, currently emerging from recent analyses, with the help of a simple model based on well-established empirical relations such as the stellar mass functions and the main sequence of star formation. This model is meant to describe observed quantities without making specific assumptions on the nature of quenching processes, but relying on their observable consequences. We find that the high gas fractions seen or suggested at high redshift in quiescent galaxies, and their apparent mild evolution at early times, can be mostly attributed to a progenitor effect where recently quenched galaxies with similar to 10% gas fractions dominate the quiescent galaxy population until z similar to 1. In the same context, the much lower gas and dust fractions measured in local early-type galaxies are interpreted as the product of the steady depletion of their interstellar medium on a similar to 2 Gyr timescale, coupled with a higher fraction of more gas-exhaustive events.
KW - galaxies: elliptical and lenticular
KW - cD
KW - galaxies: formation
KW - galaxies: ISM
KW - STAR-FORMATION
KW - ATLAS(3D) PROJECT
KW - MASS
KW - KINEMATICS
KW - REDSHIFT
KW - PATHWAYS
KW - BULGES
U2 - 10.1051/0004-6361/202039593
DO - 10.1051/0004-6361/202039593
M3 - Journal article
VL - 644
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - L7
ER -
ID: 257865297