112,680 research outputs found
DARK-MATTER IN SPIRAL GALAXIES AND THE ARIMOTO-JABLONKA PHOTOMETRIC MODEL
No full textWe use the recent stellar population synthesis models by Arimoto and Jablonka (1991), which by introducing the bulge into the calculation of galaxy masses mark a significant improvement over previous one-component models, to show that low-luminosity spiral galaxies have a higher dark matter fraction within the optical radius than high-luminosity spirals. In fact, the derived dark-to-visible mass ratio increases with decreasing luminosity, approximately as L(B)(-1/2). This conclusion agrees with previous results based on dynamical disc/halo decompositions of galaxy rotation curves (e.g. Persic and Salucci 1988). On the other hand, we do not find any strong trend between dark matter content and galaxy B-V colours, although we cannot exclude a weak one. Our results agree with Jablonka and Arimoto's (1992) conclusion that colours are not a primary indicator of the dark matter content of spiral galaxies. Instead, we confirm that the luminosity is a fundamental indicator of the dark mass fraction of spiral galaxies
L'esegesi patristica di Is 6, 1ss. in alcuni autori di area palestinese, cappadoce e antiochena fra IV e V secolo (prima parte)
No full textThe 'Sanctus' from Church Fathers commentaries on Is:6 to the liturgical praye
L'esegesi patristica di Isaia 6 in alcuni autori di area palestinese, cappadoce e antiochena fra IV e V secolo (seconda parte)
No full textTHE UNIVERSAL GALAXY ROTATION CURVE
No full textAnalyzing an extended set of selected galaxy rotation curves (with - 17.5 greater-than-or-equal-to M(B) greater-than-or-equal-to - 23.2), we find that for a given luminosity the rotation curves of spiral galaxies within the optical radius are a universal function, V(R) congruent-to 200(L(B)/L(B*))1/4 {1 + [0.12 - 0.24 log (L(B)/L(B*))](R/R(max) - 1)} km s-1 (where L(B*) = 6 x 10(10)h50(-2)L(B). and R(max) = 2.2 disk length scales are two suitable parameterization constants). This result implies strong systematic variations of both the amplitude and the profile of the circular velocity with luminosity, faint (bright) galaxies having low (high) velocities and steep (shallow) velocity gradients. Because luminous disks are self-similar, the observed progression of the shape of rotation curves with luminosity suggests that the dark-to-visible interplay varies with luminosity
Lo specifico dell’identità spirituale aquileiese nelle sue fonti letterarie patristiche e nelle sue peculiarità liturgiche primitive
No full textSynthesis of the original (non-Roman) features of the ancient Aquileian liturgy in its relations with Johannine Asia Minor and the Gallic Cisalpine and Transalpine Koinè
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
I ritmi del patriarca Paolino II: suggestioni per l’eucologia aquileiese.
No full textExamination of the ancient Christian Aquileian persistences in the hymnography of the patriarch Pauline II and comparison with similar and analogous persistences in the Ambrosian and Gallican liturgical context
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
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