Photometric scaling relations for bulges of galaxies

Ravikumar, C. D. ; Barway, S. ; Kembhavi, A. ; Mobasher, B. ; Kuriakose, V. C. (2006) Photometric scaling relations for bulges of galaxies Astronomy & Astrophysics, 446 (3). pp. 827-838. ISSN 0004-6361

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Official URL: http://www.aanda.org/articles/aa/abs/2006/06/aa354...

Related URL: http://dx.doi.org/10.1051/0004-6361:20053547

Abstract

We describe the photometric parameters of the bulges of galaxies of different Hubble types including ellipticals, lenticulars, early and late type spirals and early type dwarf galaxies. Analyzing the distributions of various photometric parameters and two- and three-dimensional correlations between them, we find that there is a difference in the correlations exhibited by bright (MK<-22) and faint bulges, irrespective of their Hubble type. Importantly, the bright bulges, which include typically E/S0 galaxies and bulges of early type spirals, are tightly distributed around a common photometric plane (PP), while their fainter counterparts, mainly bulges of late type spirals and dwarf galaxies show significant deviation from the planar distribution. We show that the specific entropy, determined from the bulge structural parameters, systematically increases as we move from late to early Hubble types. We interpret this as evidence for hierarchical merging and passive evolution scenarios for bright and faint bulges respectively.

Item Type:Article
Source:Copyright of this article belongs to European Southern Observatory.
Keywords:Galaxies: Clusters: General; Galaxies: Bulges; Galaxies: Fundamental Parameters; Galaxy: Structure
ID Code:25422
Deposited On:06 Dec 2010 13:25
Last Modified:17 May 2016 08:54

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