2020A&A...640A..64C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST09:45:08

2020A&A...640A..64C - Astronomy and Astrophysics, volume 640A, 64-64 (2020/8-1)

Molecular gas and star formation activity in luminous infrared galaxies in clusters at intermediate redshifts.

CASTIGNANI G., JABLONKA P., COMBES F., HAINES C.P., RAWLE T., JAUZAC M., EGAMI E., KRIPS M., SPERONE-LONGIN D., ARNAUD M., GARCIA-BURILLO S., SCHINNERER E. and BIGIEL F.

Abstract (from CDS):

We investigate the role of dense megaparsec-scale environments in processing molecular gas of cluster galaxies as they fall into the cluster cores. We selected a sample of ∼20 luminous infrared galaxies (LIRGs) belonging to intermediate-redshift clusters, mainly from the Herschel Lensing Survey and the Local Cluster Substructure Survey. These galaxies include MACS J0717.5+3745 at z=0.546 and Abell 697, 963, 1763, and 2219 at z=0.2-0.3. We performed spectral energy distribution modeling from the far-infrared to ultraviolet of the LIRGs, which span cluster-centric distances within r/r200≃0.2-1.6. We observed the LIRGs in CO(1-0) or CO(2-1) with the Plateau de Bure interferometer and its successor NOEMA, as part of five observational programs carried out between 2012 and 2017. We compared the molecular gas to stellar mass ratio M(H2)/M*, star formation rate (SFR), and depletion time (τdep) of the LIRGs with those of a compilation of cluster and field star-forming galaxies from the literature. The targeted LIRGs have SFR, M(H2)/M*, and τdep that are consistent with those of both main-sequence (MS) field galaxies and star-forming galaxies from the comparison sample. However we find that the depletion time, normalized to the MS value, tentatively increases with increasing r/r200, with a significance of 2.8σ, which is ultimately due to a deficit of cluster-core LIRGs with τdep≥τdep,MS. We suggest that a rapid exhaustion of the molecular gas reservoirs occurs in the cluster LIRGs and is indeed effective in suppressing their star formation and ultimately quenching them. This mechanism may explain the exponential decrease of the fraction of cluster LIRGs with cosmic time. The compression of the gas in LIRGs, possibly induced by intra-cluster medium shocks, may be responsible for the short timescales that are observed in a large fraction of cluster-core LIRGs. Some of our LIRGs may also belong to a population of infalling filament galaxies.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: clusters: general - galaxies: star formation - molecular data - submillimeter: galaxies

Status at CDS : Examining the need for a new acronym.

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 582 0
2 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 606 1
3 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 810 1
4 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 370 0
5 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 219 0
6 ClG J0926+1242 ClG 09 26 36.6 +12 42 59           ~ 34 0
7 [JPV2013] IJ101628.19+390931.9 G 10 16 28.183 +39 09 31.92   19.14   17.78   ~ 3 0
8 ACO 963 ClG 10 17 09.6 +39 01 00           ~ 355 0
9 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 263 0
10 ACO 1770 ClG 13 40 03 +41 16.8           ~ 19 0
11 ClG J1416+4446 ClG 14 16 28.1 +44 46 38           ~ 44 0
12 SDSS J162644.64+422529.7 G 16 26 44.6441450351 +42 25 29.737288532           ~ 4 0
13 ACO 2192 ClG 16 27 24.4 +42 40 43           ~ 56 0
14 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 322 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-09:45:08

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