Abstract
A multivariate statistical analysis of data measuring the optical and X-ray properties of the Einstein sample of early-type galaxies (Eskridge et al. 1995) showed that: 1) on average S0s have lower X-ray luminosity L X at fixed optical luminosity L B than do Es; 2) at fixed L B the X-ray brightest galaxies are also the roundest; this correlation holds for both morphological subsets of Es and S0s. We investigate whether a flat and partially rotationally supported galaxy is expected to host a different gas flow phase (and so a largely different amount of hot gas) with respect to a spherical pressure supported galaxy of the same L B. This is accomplished using the global energetic balance of the hot gas flows, and axisymmetric two-component galaxy models (Ciotti and Pellegrini 1995).
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References
Eskridge, P., Fabbiano, G., and Kim, D.W., (1995), Ap. J. Suppl. Ser., 442, 523
Ciotti, L., and Pellegrini, S., 1995, submitted to M.N.R.A.S.
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© 1996 Springer Science+Business Media Dordrecht
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Pellegrini, S., Ciotti, L. (1996). The Energetics of Flat and Rotating Early-Type Galaxies and Their X-Ray Luminosity. In: Bender, R., Davies, R.L. (eds) New Light on Galaxy Evolution. International Astronomical Union / Union Astronomique Internationale, vol 171. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0229-9_141
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DOI: https://doi.org/10.1007/978-94-009-0229-9_141
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-3976-2
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