Witnessing galaxy preprocessing in the local Universe: The case of a star-bursting group falling into Abell 1367

Luca Cortese, G. Gavazzi, A. Boselli, P. Franzetti, R.C. C. Kennicutt, K. O'Neil, S. Sakai

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

We present a multiwavelength analysis of a compact group of galaxies infalling at high speed into the dynamically young cluster Abell 1367. Peculiar morphologies and unusually high Ha emission are associated with two giant galaxies and at least ten dwarfs/extragalactic HII regions, making this group the region with the highest density of star formation activity ever observed in the local clusters. Moreover Ha imaging observations reveal extraordinary complex trails of ionized gas behind the galaxies, with projected lengths exceeding 150 kpc. These unique cometary trails mark the gaseous trajectory of galaxies, witnessing their dive into the hot cluster intergalactic medium. Under the combined action of tidal forces among group members and the ram-pressure by the cluster ambient medium, the group galaxies were fragmented and the ionized gas was blown out. The properties of this group suggest that environmental effects within infalling groups may have represented & preprocessing step of the galaxy evolution during the high redshift cluster assembly phase. © ESO 2006.
Original languageEnglish
Pages (from-to)847-861
Number of pages15
JournalAstronomy and Astrophysics
Volume453
Issue number3
DOIs
Publication statusPublished - 2006

Fingerprint Dive into the research topics of 'Witnessing galaxy preprocessing in the local Universe: The case of a star-bursting group falling into Abell 1367'. Together they form a unique fingerprint.

  • Cite this