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Fundamental properties of the new dwarf galaxy And VI - alias Pegasus Dwarf - another companion of M31
Ulrich Hopp, Regina E. Schulte-Ladbeck, Laura Greggio +1
We present medium deep CCD imaging in B, V, and I of the Pegasus Dwarf galaxy (And VI) which was recently found by Karachentsev & Karachentseva (1998), and independently also by Ar…
The UV emission of elliptical galaxies
Laura Greggio, Alvio Renzini
Recent observational and theoretical developments concerning the origin of the ultraviolet emission from ellipticals are reviewed and discussed,with particular, reference to the ex…
Constraints on galaxy formation from alpha-enhancement in luminous elliptical galaxies
D. Thomas, L. Greggio, R. Bender
We explore the formation of alpha-enhanced and metal-rich stellar populations in the nuclei of luminous ellipticals under the assumption of two extreme galaxy formation scenarios b…
The Mini AGN at the Center of the Elliptical Galaxy NGC 4552 with HST
Michele Cappellari, Alvio Renzini, Laura Greggio +4
The complex phenomenology shown by the UV-bright, variable spike first detected with the Hubble Space Telescope (HST) at the center of the otherwise normal galaxy NGC 4552 is furth…
The Resolved Stellar Population of the Post-Starburst Galaxy NGC 1569
L. Greggio, M. Tosi, M. Clampin +4
We present WFPC2-HST photometry (in the F439W and F555W bands) of the resolved stars in NGC 1569. The derived color-magnitude diagram (CMD) contains 2800 objects down to the 26th m…