1,726,736 research outputs found
Small-Scale Systems of Galaxies. II. Properties of the NGC 4756 Group of Galaxies
No full textThis paper is part of a series that focuses on investigating galaxy formation and evolution in small-scale systems of galaxies in low-density environments. We present results from a study of the NGC 4756 group, which is dominated by the elliptical galaxy NGC 4756. The characteristics of the group are investigated through (1) the detailed investigation of the morphological, photometric, and spectroscopic properties of nine galaxies among the dominant members of the group; (2) the determination of the photometric parameters of the faint galaxy population in an area of 34 × 34 centered on NGC 4756; and (3) an analysis of the X-ray emission in the area based on archival data.
The nine member galaxies are located in the core part of the NGC 4756 group (a strip 300 kpc in diameter, H0 = 70 km s-1 Mpc-1), which has a very loose configuration. The central part of the NGC 4756 group contains a significant fraction of early-type galaxies. Three new group members with previously unknown systemic velocities are identified, one of which is type dE. At about 75 southwest of NGC 4756 a substructure of the group is detected, including IC 829, MCG -2-33-35, MCG -2-33-36, and MCG -2-33-38, that meets the Hickson criteria for being a compact group. Most of the galaxies in this substructure show interaction signatures. We do not detect apparent fine structure and signatures of recent interaction events in the early-type galaxy population, with the exception of a strong dust lane in the elliptical galaxy MCG -2-33-38. However, this galaxy displays signatures of nuclear activity. Strong [O III], [N II], and [S II] line emission, combined with comparatively weak but broad H emission, suggests an intermediate Seyfert type classification. Although the area is heavily contaminated by the background cluster A1631, X-ray data suggest the presence of a hot intergalactic medium related to the detected X-ray emission of the group. The present results are discussed in the context of group evolution
Linked collectors and determiners for: Revision of Pseudastenus Bernhauer, synonym with Xenasterides Newton and six new species (Coleoptera, Staphylinidae, Paederinae).
No full textNatural history specimen data linked to collectors and determiners held within, "Revision of Pseudastenus Bernhauer, synonym with Xenasterides Newton and six new species (Coleoptera, Staphylinidae, Paederinae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/9f6752d6-7c9a-4756-acfe-badb2a0301d0">https://bionomia.net/dataset/9f6752d6-7c9a-4756-acfe-badb2a0301d0</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/9f6752d6-7c9a-4756-acfe-badb2a0301d0">https://gbif.org/dataset/9f6752d6-7c9a-4756-acfe-badb2a0301d0</a>. Formatted as a Frictionless Data package
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Linked collectors and determiners for: Kinorhyncha.
No full textNatural history specimen data linked to collectors and determiners held within, "Kinorhyncha". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/b4fc23e2-df21-4756-8029-e8ace96e6589">https://bionomia.net/dataset/b4fc23e2-df21-4756-8029-e8ace96e6589</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/b4fc23e2-df21-4756-8029-e8ace96e6589">https://gbif.org/dataset/b4fc23e2-df21-4756-8029-e8ace96e6589</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: Influencia de los productos de un incendio forestal sobre la germinación de cuatro especies nativas de un Bosque Altoandino disturbado.
No full textNatural history specimen data linked to collectors and determiners held within, "Influencia de los productos de un incendio forestal sobre la germinación de cuatro especies nativas de un Bosque Altoandino disturbado". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/deda46b6-3f04-4756-aa6b-20816c54a140">https://bionomia.net/dataset/deda46b6-3f04-4756-aa6b-20816c54a140</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/deda46b6-3f04-4756-aa6b-20816c54a140">https://gbif.org/dataset/deda46b6-3f04-4756-aa6b-20816c54a140</a>. Formatted as a Frictionless Data package
Proyecto de estructura e instalaciones de edificio residencial de 4756 m2 construidos
No full textProyecto confidencial (Riunet)Ros Medina, Y. (2013). Proyecto de estructura e instalaciones de edificio residencial de 4756 m2 construidos. https://riunet.upv.es/handle/10251/33212.Archivo delegad
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Hot gas in groups: NGC 5328 and the intriguing case of NGC 4756 with
No full textContext. Environment appears to have a strong influence on the fundamental properties of galaxies, modifying both their morphologies and their star formation histories. Similarly, galaxies play a role in determining the properties of the hot intergalactic medium in groups, heating and enriching it through a variety of mechanisms. NGC 5238 and NGC 4756 are the brightest unperturbed elliptical galaxies in their respective loose groups, but the analysis of their environment suggests that they may be at different evolutionary stages.
Aims. We aim to characterize the properties of the hot gas in both the halos of the brightest galaxy members and in the environment. In NGC 4756, we are also interested in the properties of a substructure identified to the southwest and the region connecting the two structures, to search for a physical connection between the two. However, we have to take into account that the group is projected against the bright, X-ray emitting cluster A1361, which heavily contaminates and confuses the emission from the foreground structure.
Methods. We present XMM-Newton observations of the groups and a careful analysis to separate different components. We examine the X-ray morphology, hot gas distribution, and spectral characteristics of both NGC 4756 and NGC 5328 and their companion galaxies. To better characterize the environment, we also present a re-evaluation of the dynamical properties of the systems. Smoothed particle hydrodynamical simulations are used to interpret the results.
Results. We find that the X-ray source associated with NGC 4756 indeed sits on top of extended emission from the background cluster A1361, but can be distinguished relatively well from it as a significant excess out to r ~ 150″ (~40 kpc). NGC 4756 has an X-ray luminosity of Lx ~ 1041 erg s-1 due to hot gas, with an average temperature of kT ~ 0.7 keV. We measure a faint diffuse emission in the region of the subclump to the SW, but more interestingly, we detect gas between the two structures, indicating a possible physical connection. The X-ray emission from NGC 5328 is clearly peaked on the galaxy, has Lx ~ 1041 erg s-1, and extends to r ~ 110 kpc. Simulations provide an excellent reproduction of the spectral energy distribution and the global properties of both galaxies, which are caught at two different epochs of the same evolutionary process, with NGC 5328 ~2.5 Gyr younger than NGC 4756
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