1,721,252 research outputs found
B-band photometry in Fornax and Virgo (Caon+ 1994)
No full textVizieR On-line Data Catalog: J/A+AS/106/19
On the shape of the light profiles of early-type galaxies. II The Dn/Ae-SBe diagram.
No full textWe present new evidence against the universality of the de Vaucouleurs r^1/4^ law, considered to be the best empirical formula for fitting the light profiles of elliptical galaxies, through the analysis of the properties of the (D_n_/A_e_)-_e_ diagram for a volume-limited sample of early-type galaxies that are members of the Virgo and Fornax clusters. The r^1/4^ law turns out to be only a particular case of the more general r^1/4^ law, where the exponent m is found to correlate with the effective radius of the galaxy. We compare our sample of early-type galaxies with that studied by Burstein et al., and find that the observed differences can be explained in terms of procedures and methodologies adopted for measuring the global photometric parameters such as total luminosities, effective radii, effective surface brightnesses and D_n_ diameters
Structure of Early-Type Galaxies
No full textWe outline the results of a two-dimensional (2D) fit to the light distribution of early-type galaxies belonging to a complete volume-limited sample and discuss briefly the significant correlations among the structural parameters. In particular we reconfirm that the lack of structural homology is probably a characteristic of hot stellar systems
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Results of a full 2D photometric decomposition of early-type galaxies
No full textWe skecth the most important results obtained from a two dimensional (2D) bulge to disk photometric decomposition of the light distribution of early-type galaxies and briefly discuss the significant correlations between the structural parameters
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