EXOSAT observations of NGC 1399 and NGC 1404: Two elliptical galaxies in the center of the Fornax cluster
- 23 Downloads
Imaging X-ray observations of the Fornax cluster of galaxies centered on NGC 1399 and NGC 1404 are presented. NGC 1399 and NGC 1404, which are separated by about 10 arc minutes, are found to have an unusually high ratio of x-ray to optical flux. We consider the possibility that the x-radiation is produced by hot gas in the cores of the galaxies. Weak X-ray emission is also detected from a point almost exactly mid-way between NGC 1399 and NGC 1404. The combined emission from the galaxies is insufficient by over an order of magnitude to account for the the low-energy X-ray emission detected from this region by the HEAO-l satellite. It is suggested that the bulk of the HEAO-1 source is diffuse gas associated with the cluster as a whole, rather than individual galaxies.
KeywordsHigh Ratio Elliptical Galaxy Individual Galaxy Optical Flux Fornax Cluster
Unable to display preview. Download preview PDF.
- Bunner, A.N., and Sanders, W.T., 1978 Bull. A. A. S. 10, 663.Google Scholar
- Long, K.S., and van Speybroeck L.P. 1983 in Accretion driven stellar X-ray sources ed. W.H.G. Lewin and E.P.J. van den Heuvel, Cambridge University Press, Cambridge, England pg. 117.Google Scholar
- Nugent, J.J., Jensen, K.A., Nousek, J.A., Garmire, G.P., Mason, K.O., Walter, F.M., Bowyer, C.S., Stern, R.A., and Riegler, G.R., 1983 Astrophys. J. Suppl. 51, 1.Google Scholar
- Nulsen, P.E.J., Stewart, G.C., and Fabian, A.C., 1984 Mon. Not. R. astr. Soc, 208, 185.Google Scholar
- Phillips, M.M., and Frogel, J.A. 1980 Astrophys. J. 235, 761.Google Scholar
- Ward, M.J., Wilson, A.S., Penston, M.V., Elvis, M., Maccacaro, T., Tritton, K.P. 1978 Astrophys. J. 223, 788.Google Scholar
- Wood, K.S., Meekins, J.F., Yentis, D.J., Smathers, H.W., McNutt, D.P., Bleach, R.D., Byram, E.T., Chubb, T.A., Friedman. H. and Meidav, M. 1984 Astrophys. J. Suppl. (in press).Google Scholar