We present CO ( 2-1 ) observations of 72 galaxies in the nearby , disturbed Antlia galaxy cluster with the Atacama Pathfinder Experiment ( APEX ) telescope .
The galaxies in our sample are selected to span a wide range of stellar masses ( 10 ^ { 8 } M _ { \odot } \lesssim M _ { \star } \lesssim 10 ^ { 10 } M _ { \odot } ) and star formation rates ( 0.0005 M _ { \odot } yr ^ { -1 } < \text { SFR } < 0.3 M _ { \odot } yr ^ { -1 } ) .
Reaching a depth of 23 mJy in 50 km s ^ { -1 } channels , we report a total CO detection rate of 37.5 % and a CO detection rate of 86 % for sources within 1 dex of the main sequence .
We compare our sample with a similar sample of galaxies in the field , finding that , for a fixed stellar mass and SFR , galaxies in the Antlia cluster have comparable molecular gas reservoirs to field galaxies .
We find that \sim 41 \% ( 11/27 ) of our CO detections display non-Gaussian CO ( 2-1 ) emission line profiles , and a number of these sources display evidence of quenching in their optical images .
We also find that the majority of our sample lie either just below , or far below the main sequence of field galaxies , further hinting at potential ongoing quenching .
We conclude that the Antlia cluster represents an intermediate environment between fields and dense clusters , where the gentler intracluster medium ( ICM ) allows the cluster members to retain their reservoirs of molecular gas , but in which the disturbed ICM is just beginning to influence the member galaxies , resulting in high SFRs and possible ongoing quenching .