A red envelope around a dominant elliptical galaxy in an X-ray selected poor cluster

Astronomy and Astrophysics – Astrophysics

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Astronomical Photometry, Elliptical Galaxies, Galactic Clusters, X Ray Sources, Astronomical Spectroscopy, Halos, Interstellar Extinction, X Ray Spectra

Scientific paper

A photometric and spectroscopic study of the optical counterpart of the X-ray source 1E 1111.9-3754 has revealed a poor cluster of galaxies dominated by a very luminous giant elliptical. Three-color surface photometry of this galaxy shows that the elliptical body is surrounded by a large envelope with colors redder than the galaxy. The formation of this system in a high velocity dispersion poor cluster is briefly discussed.

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