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- W3021789916 abstract "view Abstract Citations (93) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Did Elliptical Galaxies Form by Mergers or by Dissipative Collapse? Kormendy, John Abstract Observed parameter scaling laws show that lower luminosity ellipticals have higher central densities and smaller core radii, if they formed by mergers, they are very unlike their progenitors. In the extreme case of M32, the central surface brightness is μ_0_ <~ 12 V mag arcsec^-2^ and the core radius is r_c_ <~ 0.001 kpc, while plausible progenitor disk galaxies have μ_0_ ~ 22 V mag arcsec^-2^ and r_c_ ~ 0.5 kpc. M32 must have formed by a dissipative collapse, whether or not a merger was involved. The cooling diagram also shows that low-luminosity ellipticals formed with more dissipation than high-luminosity ellipticals. Thus the merger picture of galaxy formation required essential aspects of the dissipative collapse picture. In fact, each of these theories has been evolving toward the other; the most fundamental differences between them have now disappeared. Publication: The Astrophysical Journal Pub Date: July 1989 DOI: 10.1086/185485 Bibcode: 1989ApJ...342L..63K Keywords: Elliptical Galaxies; Galactic Evolution; Astronomical Photometry; Brightness Distribution; Galactic Structure; Gravitational Collapse; Astrophysics; GALAXIES: FORMATION; GALAXIES: INTERACTIONS; GALAXIES: PHOTOMETRY; GALAXIES: STRUCTURE full text sources ADS | data products SIMBAD (2) NED (2)" @default.
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- W3021789916 date "1989-07-01" @default.
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- W3021789916 title "Did elliptical galaxies form by mergers or by dissipative collapse?" @default.
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