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Dependencia ambiental de las propiedades de halos de materia oscura
Full text linkTesis (Doctor en Astronomía)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2008
Deep Near-Infrared Imaging of Submillimeter Selected Galaxies
No full textWe report on a deep near-infrared survey of submillimeter galaxies (SMGs) using the Near Infrared Camera (NIRC) on the Keck I telescope. Of the 15 background submillimeter sources in the SCUBA Cluster Lens Survey, 12 have candidate K-band counterparts to K∼23 with a lensing-corrected median of 〈K〉=22±1 mag. For SMGs with accurate radio and/or millimeter positions, the median NIR color is 〈J−K〉=2.6 mag. Bright SMGs (K3 mag sources indicates they are more numerous than S_(850μm)>2 mJy SMGs and could either represent the faint end of the SMG population or a distinct class of high redshift galaxies. This ambiguity will be clarified by SIRTF observations of the rest-frame near-IR emission from this faint red galaxy population
Dynamics Survey
Full text linkThe Lenses Structure & Dynamics (LSD) Survey aims at studying the internal structure of luminous and dark matter - as well as their evolution - of field earlytype (E/SO) galaxies to z ∼ 1. In particular, E/S0 lens galaxies are studied by combining gravitational lensing, photometric and kinematic data obtained with ground-based (VLA/Keck/VLT) and space-based telescopes (HST). Here, we report on preliminary results from the LSD Survey, in particular on (i) the constraints set on the luminous and dark-matter distributions in the inner several R_(eff) of E/S0 galaxies, (ii) the evolution of their stellar component and (iii) the constraints set on the value of H0 from time-delay systems by combining lensing and kinematic data to break degeneracies in gravitational-lens models
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
X-ray Cluster Properties with SPH
No full textResults from a large set of hydrodynamical SPH simulations
of galaxy clusters in a flat LCDM cosmology are used to investigate
cluster X-ray properties. The physical modeling of the gas includes radiative
cooling, star formation, energy feedback and metal enrichment that
follows from the explosions of SNe type II and Ia.
The metallicity dependence of the cooling function is also taken into account.
It is found that the luminosity-temperature relation of simulated clusters
is in good agreement with the data, and the X-ray properties of cool
clusters are unaffected by the amount of feedback energy that has heated the
intracluster medium (ICM). The fraction of hot gas at the virial radius
increases with
and the distribution obtained from the simulated cluster sample is consistent
with the observational ranges
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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