It is shown on the basis of a complete sample of Virgo cluster galaxies and a larger set of varied data from the literature that ellipticals, early-type dwarfs, and bulges of S0s and spiral form two distinct families in the plane of the effective parameters mu(e) and R(e). While the 'normal' family encompasses all galaxies fainter than M(B) of -19

In this paper we propose a method to classify faint objects from digital astronomical images based on multilayer feed-forward neural networks which have been trained by the back-propagation procedure (Rumelhart 1986) from real data.

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X-ray data and analysis packages can now be distributed directly to the desks of the user community using CDROMs and portable, familiar analysis packages (like IRAF/PROS). The Einstein IPC Slew Survey is an example of a complete X-ray data set distributed via CDROMs and is the first to use the new FITS standard for photon event lists (BINTABLE)

X-ray data from the ROSAT satellite will be distributed to Guest Observers on FITS tapes. The precise contents and format of the tape were chosen bearing the following issues in mind: 1. The primary data component for an X-ray observation is a list of photon events, and the user requires additional data for selection and analysis of the primary

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