GALAXY GROUPS ARE A KEY ENVIRONMENT FOR STUDIES OF FEEDBACK PROCESSES GALAXY EVOLUTION AND STRUCTURE FORMATION BUT BIASES IN CURRENT OPTICAL OR X-RAY SELECTED SAMPLES HAMPER THESE EFFORTS. WE DEFINED A COMPLETE OPTICALLY-SELECTED SAMPLE OF 53 NEARBY GROUPS SUITABLE FOR X-RAY AND RADIO FOLLOW-UP AND RECENTLY PUBLISHED A STUDY OF THE X-RAY PROPERTIES AND ROLE OF AGN FEEDBACK IN THE RICHER 26-GROUP SUBSAMPLE. WE NOW PROPOSE TO OBSERVE THE 17 GROUPS NEEDED TO COMPLETE THE FULL SAMPLE. IN COMBINATION WITH OUR COMPLETED CO AND MULTI-BAND RADIO SURVEYS THESE OBSERVATIONS WILL ALLOW DETAILED STUDIES OF THE GAS CONTENT PHYSICAL PROPERTIES AND FEEDBACK HISTORY OF AN UNBIASED SAMPLE OF GROUPS AND SIGNIFICANTLY IMPROVE OUR UNDERSTANDING OF THE MASS DISTRIBUTION OF THE LOCAL VOLUME.

Smithsonian Institution, Washington DC

Investigators