Deep Optical Imaging of A Compact Group of Galaxies, Seyfert's Sextet

Details Deep Optical Imaging of A Compact Group of Galaxies, Seyfert's Sextet Deep Optical Imaging of A Compact Group of Galaxies, Seyfert's Sextet

2000-07-17

arxiv.org/abs/astro-ph/0007220v1

Astronomy and Astrophysics

Astrophysics

7 pages text (emulateapj LaTeX), 8 figures (3 EPS files, 1 PostScript file, and 4 jpeg files) figures, The Astronomical Journa

Scientific paper

10.1086/316799

In order to investigate the dynamical status of Seyfert's Sextet (SS), we have obtained a deep optical ($VR+I$) image of this group. Our image shows that a faint envelope, down to a surface brightness $\mu_{\rm optical}$(AB) $\simeq 27$ mag arcsec$^{-2}$, surrounds the member galaxies. This envelope is irregular in shape. It is likely that this shape is attributed either to recent-past or to on-going galaxy interactions in SS. If the member galaxies have experienced a number of mutual interactions over a long timescale, the shape of the envelope should be rounder. Therefore, the irregular-shaped morphology suggests that SS is in an early phase of dynamical interaction among the member galaxies. It is interesting to note that the soft X-ray image obtained with ROSAT (Pildis et al. 1995) is significantly similar in morphology. We discuss the possible future evolution of SS briefly.

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