Abstract
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 R 200 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 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 × 109K 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.
Original language | English |
---|---|
Article number | L21 |
Journal | Astrophysical Journal Letters |
Volume | 841 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2017 Jun 1 |
Externally published | Yes |
Keywords
- galaxies: ISM
- galaxies: clusters: individual (XMMXCS J2215.91738)
- galaxies: evolution
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science