2020A&A...640A..65C


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET19:46:29

2020A&A...640A..65C - Astronomy and Astrophysics, volume 640A, 65-65 (2020/8-1)

Molecular gas in CLASH brightest cluster galaxies at z ∼ 0.2 - 0.9.

CASTIGNANI G., PANDEY-POMMIER M., HAMER S.L., COMBES F., SALOME P., FREUNDLICH J. and JABLONKA P.

Abstract (from CDS):

Brightest cluster galaxies (BCGs) are excellent laboratories for the study of galaxy evolution in dense Mpc-scale environments. We used the IRAM-30 m to observe, in CO(1-0), CO(2-1), CO(3-2), or CO(4-3), 18 BCGs at z∼0.2-0.9 drawn from the Cluster Lensing And Supernova survey with Hubble (CLASH) survey. Our sample includes RX1532, which is our primary target as it is among the BCGs with the highest star formation rate (SFR≥100M/yr) in the CLASH sample. We unambiguously detected both CO(1-0) and CO(3-2) in RX1532, yielding a large reservoir of molecular gas, MH2=(8.7±1.1)x1010M, and a high level of excitation, r31=0.75±0.12. A morphological analysis of the Hubble Space Telescope I-band image of RX1532 reveals the presence of clumpy substructures both within and outside the half-light radius re=(11.6±0.3)kpc, similarly to those found independently both in ultraviolet and in Hα in previous works. We tentatively detected CO(1-0) or CO(2-1) in four other BCGs, with molecular gas reservoirs in the range of MH2=2x1010–11M. For the remaining 13 BCGs, we set robust upper limits of MH2/M*≤0.1, which are among the lowest molecular-gas-to-stellar-mass ratios found for distant ellipticals and BCGs. In comparison with distant cluster galaxies observed in CO, our study shows that RX1532 (MH2/M*=0.40±0.05) belongs to the rare population of star-forming and gas-rich BCGs in the distant universe. By using the available X-ray based estimates of the central intra-cluster medium entropy, we show that the detection of large reservoirs of molecular gas MH2≥1010M in distant BCGs is possible when the two conditions are met: (i) high SFR and (ii) low central entropy, which favors the condensation and the inflow of gas onto the BCGs themselves, similarly to what has been previously found for some local BCGs.

Abstract Copyright: © ESO 2020

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

VizieR on-line data: <Available at CDS (J/A+A/640/A65): list.dat sp/*>

Simbad objects: 31

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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 209 ClG 01 31 57.5 -13 34 35           ~ 253 0
2 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 462 2
3 ACO 383 ClG 02 48 06.9 -03 29 32           ~ 304 0
4 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3592 3
5 ClG J0329-0212 ClG 03 29 41.6 -02 11 47           ~ 109 0
6 MCS J0416.1-2403 ClG 04 16 08.380 -24 04 20.80           ~ 226 0
7 ClG J0429-0253 ClG 04 29 36.0 -02 53 09           ~ 99 0
8 ClG J0647+7015 ClG 06 47 50.0 +70 14 55           ~ 129 0
9 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 374 0
10 ClG J0744+3927 ClG 07 44 52.5 +39 27 30           ~ 163 0
11 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 229 0
12 3C 244.1 QSO 10 33 33.982 +58 14 35.85   19.0 19.0     ~ 175 1
13 SpARCS J104922+564032 ClG 10 49 22.60 +56 40 32.5           ~ 14 0
14 MCS J1115.8+0129 ClG 11 15 52.1 +01 29 53           ~ 103 0
15 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 336 0
16 ACO 1423 ClG 11 57 47.34 +33 42 43.5           ~ 143 0
17 MCS J1206.2-0847 ClG 12 06 12.2 -08 48 02           ~ 187 0
18 GALEX J122658.7+333249 BiC 12 26 58.25 +33 32 48.6     21.09   19.13 ~ 6 0
19 ClG J1311-0311 ClG 13 11 01.7 -03 10 38           ~ 92 0
20 [CK2002] C47318-4511 GiC 13 47 31.87 -11 45 11.2           ~ 5 0
21 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 181 0
22 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 94 0
23 EIRS 48 G 16 11 12.667 +55 08 23.72       21.00 21.25 ~ 8 0
24 ClG J1720+3536 ClG 17 20 16.8 +35 36 27           ~ 117 1
25 ACO 2261 ClG 17 22 28.3 +32 09 13           ~ 291 0
26 ClG J1931-2635 ClG 19 31 49.6 -26 34 33           ~ 127 0
27 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2136 2
28 ClG J2129-0741 ClG 21 29 26.0 -07 41 28           ~ 140 0
29 2MASX J21293995+0005207 BiC 21 29 39.953 +00 05 21.16           ~ 25 0
30 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 350 0
31 ACO S 1063 ClG 22 48 54.3 -44 31 07           ~ 215 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-19:46:29

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