2017ApJ...841L..21H

Query : 2017ApJ...841L..21H

2017ApJ...841L..21H - Astrophys. J., 841, L21-L21 (2017/June-1)

Evolutionary phases of gas-rich galaxies in a galaxy cluster at z = 1.46.

HAYASHI M., KODAMA T., KOHNO K., YAMAGUCHI Y., TADAKI K.-I., HATSUKADE B., KOYAMA Y., SHIMAKAWA R., TAMURA Y. and SUZUKI T.L.

Abstract (from CDS):

We report a survey of molecular gas in galaxies in the XMMXCS J2215.9-1738 cluster at z = 1.46. We have detected emission lines from 17 galaxies within a radius of R200 from the cluster center, in Band 3 data of the Atacama Large Millimeter/submillimeter Array, with a coverage of 93-95 GHz in frequency and 2.33 arcmin2 in spatial direction. The lines are all identified as CO J = 2-1 emission lines from cluster members at z∼1.46 by their redshifts and the colors of their optical and near-infrared (NIR) counterparts. The line luminosities reach down to LCO(2–1)^′^=4.5×109 K km s–1 pc2. The spatial distribution of galaxies with a detection of CO(2-1) suggests that they disappear from the very center of the cluster. The phase-space diagram showing relative velocity versus cluster-centric distance indicates that the gas-rich galaxies have entered the cluster more recently than the gas-poor star-forming galaxies and passive galaxies located in the virialized region of this cluster. The results imply that the galaxies experienced ram-pressure stripping and/or strangulation during the course of infall toward the cluster center and then the molecular gas in the galaxies at the cluster center was depleted by star formation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: individual: XMMXCS J2215.9-1738 - galaxies: evolution - galaxies: ISM - galaxies: ISM

Nomenclature: Table 1: [HKK2017] ALMA.B3.NN (Nos 1-17).

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 - 2024 		#notes
1 SSTU J221556.92-173804.7 GiC 22 15 56.92 -17 38 05.0         23.03 ~ 7 0
2 [HLS2010] 35 GiC 22 15 57.23 -17 37 53.2   25.15     23.78 ~ 14 0
3 [BMC2017] XMM2215 940 G 22 15 57.28 -17 37 58.0           ~ 6 0
4 [BMC2017] XMM2215 919 G 22 15 57.51 -17 38 00.5           ~ 6 0
5 [HKK2017] ALMA.B3.9 G 22 15 57.76 -17 37 45.2           ~ 4 0
6 [BMC2017] XMM2215 732 G 22 15 58.05 -17 38 18.7           ~ 6 0
7 [BMC2017] XMM2215 776 G 22 15 58.16 -17 38 14.5           ~ 8 0
8 SSTU J221558.22-173822.1 G 22 15 58.23 -17 38 22.2           ~ 9 0
9 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 101 0
10 [BMC2017] XMM2215 1051 G 22 15 58.54 -17 37 47.7           ~ 8 0
11 [SSS2017] 1 G 22 15 58.75 -17 37 41.0           ~ 5 0
12 [HKK2017] ALMA.B3.4 G 22 15 59.52 -17 37 54.2           ~ 5 0
13 SSTU J221559.68-173758.9 GiC 22 15 59.72 -17 37 59.0           ~ 10 0
14 [HKK2017] ALMA.B3.13 G 22 15 59.77 -17 38 16.7           ~ 5 0
15 [HKK2017] ALMA.B3.17 G 22 16 00.38 -17 38 57.7           ~ 4 0
16 SSTU J221600.38-173750.5 GiC 22 16 00.41 -17 37 50.7         23.52 ~ 8 0
17 [HKK2017] ALMA.B3.15 G 22 16 00.83 -17 38 32.5           ~ 4 0
18 [HKK2017] ALMA.B3.16 G 22 16 00.92 -17 38 31.5           ~ 4 0

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