Exploring the impact of galaxy interactions over seven billion years with CAS

Sarah H. Miller, S. Jogee, C. Conselice, K. Penner, E. Bell, X. Zheng, C. Papovich, R. Skelton, R. Somerville, H. -W. Rix, F. Barazza, M. Barden, A. Borch, S. Beckwith, J. Caldwell, B. Haeussler, C. Heymans, K. Jahnke, D. McIntosh, K. MeisenheimerC. Peng, A. Robaina, S. Sanchez, L. Wisotzki, C. Wolf

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We explore galaxy assembly over the last seven billion years by characterizing "normal" galaxies along the Hubble sequence, against strongly disturbed merging/interacting galaxies with the widely used CAS system of concentration (C), asymmetry (A), and 'clumpiness' (S) parameters, as well as visual classification. We analyze Hubble Space Telescope (HST) ACS images of similar to 4000 intermediate and high mass (M/M-circle dot > 10(9)) galaxies from the GEMS survey, one of the largest HST surveys conducted to date in two filters. We explore the effectiveness of the CAS criteria [A > S and A > 0.35] in separating normal and strongly disturbed galaxies at different, redshifts, and quantify the recovery and contamination rate. We also compare the average star formation rate and the cosmic star formation rate density as a function of redshift between normal and interacting systems identified by CAS.

Original languageEnglish
Title of host publicationNEW HORIZONS IN ASTRONOMY: FRANK N. BASH SYMPOSIUM 2007
EditorsA Frebel, JR Maund, J Shen, MH Siegel
Place of PublicationSAN FRANCISCO
PublisherASTRONOMICAL SOC PACIFIC
Pages235-238
Number of pages4
ISBN (Print)978-1-58381-656-1
Publication statusPublished - 2008
EventFrank N Bash Symposium on New Horizons Astronomy - Austin
Duration: 14 Oct 200716 Oct 2007

Conference

ConferenceFrank N Bash Symposium on New Horizons Astronomy
CityAustin
Period14/10/0716/10/07

Keywords

  • HIGH-REDSHIFT GALAXIES
  • NEARBY

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