A deep spectroscopic study of the filamentary nebulosity in NGC 4696, the brightest cluster galaxy in the Centaurus cluster

作者：Canning R E A^*; Fabian A C; Johnstone R M; Sanders J S; Crawford C S; Ferland G J; Hatch N A

来源：Monthly Notices of the Royal Astronomical Society, 2011, 417(4): 3080-3099.

DOI：10.1111/j.1365-2966.2011.19470.x

• galaxies: clusters: individual: Centaurus
• galaxies: individual: NGC 4696

We present results of deep integral-field spectroscopy observations using high-resolution optical (41507200 angstrom) 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 Ha emission-line nebula (L-H alpha= 2.2 x 10(40) erg s(-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.

• 出版日期2011-11