Discovery of structure in the envelope of the cD galaxy in the cluster Abell 1795

Details Discovery of structure in the envelope of the cD galaxy in the cluster Abell 1795 Discovery of structure in the envelope of the cD galaxy in the cluster Abell 1795

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248p..18j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 18P-20P. Royal Society-supported

Other

19

Galactic Clusters, Galactic Structure, Halos, Astronomical Maps, Brightness Distribution

Scientific paper

The discovery of structure in the cD envelope of the central galaxy in the rich cluster A1795 is reported. The envelope extends predominantly in the north-south direction to at least 400 kpc from the center of the galaxy. At the largest radii, there is a region to the south of low surface brightness that turns slightly to the east. The total I-band magnitude of the galaxy and envelope is at least -26.6, indicating that it is one of the most luminous galaxies known. It is suggested that the structure in the envelope has been caused by a past merger of the central galaxy with another giant galaxy, probably in a subcluster that merged with the cluster. This would explain the alignment of both cD envelope and cluster.

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