0 Where do we stand ? By ROSEMARY

نویسنده

  • ROSEMARY F. G. WYSE
چکیده

Classical bulges are centrally-concentrated, high surface density, three-dimensional stellar systems. Their high density could arise either because significant gaseous dissipation occurred during their formation, or could simply reflect formation at very high redshift (or some combination of these two, depending on the density). For illustration, equating the mean mass density within the luminous parts of a galaxy (assumed to have circular velocity vc and radius rc) with the cosmic mean mass density at a given redshift, zf , gives (e.g. Peebles 1989)

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تاریخ انتشار 2005