Infall of the Elliptical Galaxy NGC 1404 into the Fornax Cluster

Details Infall of the Elliptical Galaxy NGC 1404 into the Fornax Cluster Infall of the Elliptical Galaxy NGC 1404 into the Fornax Cluster

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4317d&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #43.17; Bulletin of the American Astronomical Society, Vol. 34, p.712

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We present our analysis of Chandra ACIS observations of the elliptical galaxies NGC 1399 and NGC 1404 in the Fornax cluster. The X-ray image of NGC 1404 shows a sharp surface brightness edge on the side of the galaxy toward NGC 1399, indicating that NGC 1404 is falling toward NGC 1399, through the cluster gas. A temperature map, derived from these observations, shows the ISM in NGC 1404 is colder than the surrounding gas in the Fornax cluster. The edge is thus a cold front, shaped by the ram pressure of the cluster gas as NGC 1404 falls towards the cluster center. We present a temperature map and density profiles of the gas around NGC 1404 and a temperature map of the surrounding intracluster medium (ICM), as well as a measure of the infall velocity for NGC 1404. This work has been supported by NASA contract NAS8-39073, and the Smithsonian Institution.

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