Query : 2021A&A...653A...6C

2021A&A...653A...6C - Astronomy and Astrophysics, volume 653A, 6-6 (2021/9-1)

Investigating the delay between dust radiation and star-formation in local and distant quenching galaxies.


Abstract (from CDS):

We investigate the timescale over which the infrared (IR) luminosity decreases after a complete and rapid quenching of star formation using observations of local and high-redshift galaxies. From spectral energy distribution modelling, we derive the time since quenching of a subsample of 14 galaxies from the Herschel Reference Survey that suffer from ram-pressure stripping due to the environment of the Virgo cluster and of a subsample of 7 rapidly quenched COSMOS galaxies selected through a state-of-the-art statistical method already tested on the determination of galaxy star formation history (SFH). Three out of the seven COSMOS galaxies have an optical spectrum with no emission line, confirming their quenched nature. We obtained the present physical properties of the combined sample (local plus high-redshift) from the long-term SFH properties, as well as the past LIR of these galaxies just before their quenching. We show that this past LIR is consistent with the LIR of reference samples of normally star-forming galaxies with same stellar mass and redshift as each of our quenched galaxies. We put constraints on the present to past IR luminosity ratio as a function of quenching time. The two samples probe different dynamical ranges in terms of quenching age with the HRS galaxies exhibiting longer timescales (0.2-3Gyr) compared to the COSMOS ones (<100Myr). Assuming an exponential decrease in the LIR after quenching, the COSMOS quenched galaxies are consistent with short e-folding times of less than a couple of hundred million years, while the properties of the HRS quenched galaxies are compatible with larger timescales of several hundred million years. For the HRS sample, this result is consistent with the known quenching mechanism that affected them, namely ram pressure stripping due to the environment. For the COSMOS sample, different quenching processes are acting on short to intermediate timescales. Processes such as galaxy mergers, disk instabilities, and environmental effects can produce such strong star formation variability.

Abstract Copyright: © L. Ciesla et al. 2021

Journal keyword(s): galaxies: evolution - galaxies: fundamental parameters

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2751 0
2 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6448 0
3 IC 3476 GiG 12 32 41.744 +14 03 05.81   13.5       ~ 195 0
4 2MASX J12392226-0539536 GiP 12 39 22.2421296096 -05 39 53.113937868   16.34   15.00   ~ 22 0

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