A deep spectroscopic study of the filamentary nebulosity in NGC4696, the brightest cluster galaxy in the Centaurus cluster

R. E.A. Canning, A. C. Fabian, R. M. Johnstone, J. S. Sanders, C. S. Crawford, G. J. Ferland, N. A. Hatch

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We present results of deep integral-field spectroscopy observations using high-resolution optical (4150-7200Å) VLT VIsible MultiObject Spectrograph spectra of NGC 4696, the dominant galaxy in the Centaurus cluster (Abell 3526). After the Virgo cluster, this is the second nearest (z= 0.0104) example of a cool-core cluster. NGC 4696 is surrounded by a vast, luminous Hα emission-line nebula (L= 2.2 × 1040ergs-1). We explore the origin and excitation of the emission-line filaments and find their origin consistent with being drawn out, under rising radio bubbles, into the intracluster medium as in other similar systems. Contrary to previous observations, we do not observe evidence for shock excitation of the outer filaments. Our optical spectra are consistent with the recent particle heating excitation mechanism of Ferland et al.

Original languageEnglish
Pages (from-to)3080-3099
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume417
Issue number4
DOIs
StatePublished - Nov 2011

Keywords

  • Galaxies: clusters: individual: Centaurus
  • Galaxies: individual: NGC 4696

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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