2018MNRAS.479..703C

Query : 2018MNRAS.479..703C

2018MNRAS.479..703C - Mon. Not. R. Astron. Soc., 479, 703-729 (2018/September-1)

Merger-driven star formation activity in Cl J1449+0856 at z = 1.99 as seen by ALMA and JVLA.

COOGAN R.T., DADDI E., SARGENT M.T., STRAZZULLO V., VALENTINO F., GOBAT R., MAGDIS G., BETHERMIN M., PANNELLA M., ONODERA M., LIU D., CIMATTI A., DANNERBAUER H., CAROLLO M., RENZINI A. and TREMOU E.

Abstract (from CDS):

We use Atacama Large Millimetre Array and Jansky Very Large Array observations of the galaxy cluster Cl J1449+0856 at z = 1.99, in order to study how dust-obscured star formation, interstellar medium content, and active galactic nuclei activity are linked to environment and galaxy interactions during the crucial phase of high-z cluster assembly. We present detections of multiple transitions of 12CO, as well as dust continuum emission detections from 11 galaxies in the core of Cl J1449+0856. We measure the gas excitation properties, star formation rates, gas consumption timescales, and gas-to-stellar mass ratios for the galaxies. We find evidence for a large fraction of galaxies with highly excited molecular gas, contributing >50 per cent to the total star formation rate (SFR) in the cluster core. We compare these results with expectations for field galaxies, and conclude that environmental influences have strongly enhanced the fraction of excited galaxies in this cluster. We find a dearth of molecular gas in the galaxies' gas reservoirs, implying a high star formation efficiency (SFE) in the cluster core, and find short gas depletion timescales τdep < 0.1-0.4 Gyr for all galaxies. Interestingly, we do not see evidence for increased specific SFRs (sSFRs) in the cluster galaxies, despite their high SFEs and gas excitations. We find evidence for a large number of mergers in the cluster core, contributing a large fraction of the core's total star formation compared with expectations in the field. We conclude that the environmental impact on the galaxy excitations is linked to the high rate of galaxy mergers, interactions, and active galactic nuclei in the cluster core.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: clusters: individual: Cl J1449+0856 - galaxies: evolution - galaxies: high-redshift - galaxies: ISM - galaxies: star formation

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ClG J0218-0510 ClG 02 18 21.3 -05 10 27           ~ 82 0
2 NAME SMM J123711+622212 rG 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 237 0
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
4 QSO B1334-127 Bla 13 37 39.78278132 -12 57 24.6933925   18.5 19.00 16.22   ~ 540 1
5 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 70 0
6 [SDG2016] 2 G 14 49 13.41 +08 56 34.7           ~ 5 0
7 [SCD2018] A4 G 14 49 13.56 +08 56 16.0           ~ 4 0
8 [SCD2018] A2 G 14 49 13.70 +08 56 22.2           ~ 6 0
9 [SDG2016] 13 G 14 49 14.05 +08 56 31.2           ~ 7 0
10 [SCD2018] A1 G 14 49 14.09 +08 56 25.3           ~ 6 0
11 [SDG2016] 1 G 14 49 14.14 +08 56 26.6           ~ 3 0
12 [SDG2016] 3 G 14 49 14.18 +08 56 22.2           ~ 6 0
13 [SCD2018] A5 G 14 49 14.31 +08 56 12.8           ~ 3 0
14 [SDG2016] 6 G 14 49 14.38 +08 56 16.0           ~ 7 0
15 [SCD2018] HS7 G 14 49 14.45 +08 56 23.3           ~ 6 0
16 [SCD2018] HN7 G 14 49 14.47 +08 56 23.6           ~ 6 0
17 4C 05.64 Bla 15 50 35.26924234 +05 27 10.4483641   19.10 18.73 19.02   ~ 371 1
18 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 106 0

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