1,724,695 research outputs found
The 3 micron spectrum of NGC 4565
No full textResearchers spectrum of NGC 4565 is essentially featureless. The absence of the 3.0 micron feature (Tau 3.0 less than 0.05) implies that the extinction to the nucleus does not arise to a significant degree in molecular clouds. Researchers deduce Tau 3.0/A sub V less than 0.01, compared with approx. 0.022 for GC-IRS7. These results support the conclusion (McFadzean et al. 1989) that the 3.0 micron absorption in the GC-IR sources is due to the presence of ice in a (probably single) foreground molecular cloud. The 3.4 micron feature is also weak or absent in the researchers spectrum of NGC 4565 (Tau 3.4 less than or equal to 0.07), hence, Tau 3.4/A sub V less than or equal to 0.016, compared with approx. 0.008 towards GC-IRS7. The absence of the feature in NGC 4565 at the signal-to-noise level of the current observations is consistent with a probable moderate degree of extinction towards the nucleus. The observations of NGC 4565 provide a useful comparison for studies of dust in the Galaxy. Limits have been set on the strengths of the 3.0 and 3.4 micron features in NGC 4565. The absence of 3.0 micron absorption is significant, and supports the view that the feature at this wavelength in the Galactic Centre is due to water-ice absorption in a foreground molecular cloud. The non-detection of the 3.4 micron absorption is less surprising and provides indirect support for the association between this feature and the diffuse interstellar medium. The current spectrum probably represents the best that can be achieved with a single-detector instrument within reasonable integration times. It will clearly be of interest in the future to obtain spectra of higher signal-to-noise, as a positive detection of the 3.4 micron feature in an external galaxy, even at a low level, would be of considerable astrophysical significance
Linked collectors and determiners for: University of Cincinnati, Margaret H. Fulford Herbarium - Lichens.
No full textNatural history specimen data linked to collectors and determiners held within, "University of Cincinnati, Margaret H. Fulford Herbarium - Lichens". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/09045f56-4565-4a15-99db-4641154e6f9b">https://bionomia.net/dataset/09045f56-4565-4a15-99db-4641154e6f9b</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/09045f56-4565-4a15-99db-4641154e6f9b">https://gbif.org/dataset/09045f56-4565-4a15-99db-4641154e6f9b</a>. Formatted as a Frictionless Data package
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
Detection of A Pseudobulge Hidden inside the "Box-Shaped Bulge" of NGC 4565
No full textNumerical simulations show that box-shaped bulges of edge-on galaxies are not bulges: they are bars seen side-on. Therefore, the two components that are seen in edge-on Sb galaxies such as NGC 4565 are a disk and a bar. But face-on SBb galaxies always show a disk, a bar, and a (pseudo) bulge. Where is the (pseudo) bulge in NGC 4565? We use archival Hubble Space Telescope H-band images and Spitzer Space Telescope 3.6 mu m wavelength images, both calibrated to Two Micron All Sky Survey K(s) band, to penetrate the prominent dust lane in NGC 4565. We find a high surface brightness, central stellar component that is clearly distinct from the boxy bar and from the disk. Its brightness profile is a Sersic function with index n = 1.55 +/- 0.07 along the major axis and 1.33 +/- 0.12 along the minor axis. Therefore, it is a pseudobulge. It is much less luminous than the boxy bar, so the true pseudobulge-to-total luminosity ratio of the galaxy is PB/T = 0.06 +/- 0.01, much less than the previously believed value of B/T = 0.4 for the "boxy bulge." We infer that published B/T luminosity ratios of edge-on galaxies with boxy bulges have been overestimated. Therefore, more galaxies than we thought contain little or no evidence of a merger-built classical bulge. From a Formation point of view, NGC 4565 is a giant, pure-disk galaxy. This presents a challenge to our picture of galaxy Formation by hierarchical clustering: it is difficult to grow galaxies as big as NGC 4565 without also making big classical bulges.NASA NAS 5-26555NSF AST-0607490Astronom
Variations on the Author
No full text“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
La douleur en philosophie, https://notcom.hypotheses.org/4565
No full textÉpisode du podcast Notcom réalisé par Amélie Berger-Soraruff. L'entretien est disponible à la lecture en français et en anglais.Entretien audio réalisé par Amélie Berger-Soraruff, dans le cadre du podcast Notcom: https://notcom.hypotheses.org/4565. Cet entretien aborde le problème de la douleur à l'époque moderne, dans la philosophie cartésienne en particulier (thème du livre Le Fer ou le Feu. Penser la douleur après Descartes, Classiques Garnier, 2025). Traduction anglaise disponible à la lecture p. 7: https://notcom.hypotheses.org/files/2025/02/La-douleur-en-philosophie-SCRIPT.pd
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
La douleur en philosophie, https://notcom.hypotheses.org/4565
No full textÉpisode du podcast Notcom réalisé par Amélie Berger-Soraruff. L'entretien est disponible à la lecture en français et en anglais.Entretien audio réalisé par Amélie Berger-Soraruff, dans le cadre du podcast Notcom: https://notcom.hypotheses.org/4565. Cet entretien aborde le problème de la douleur à l'époque moderne, dans la philosophie cartésienne en particulier (thème du livre Le Fer ou le Feu. Penser la douleur après Descartes, Classiques Garnier, 2025). Traduction anglaise disponible à la lecture p. 7: https://notcom.hypotheses.org/files/2025/02/La-douleur-en-philosophie-SCRIPT.pd
La douleur en philosophie, https://notcom.hypotheses.org/4565
No full textÉpisode du podcast Notcom réalisé par Amélie Berger-Soraruff. L'entretien est disponible à la lecture en français et en anglais.Entretien audio réalisé par Amélie Berger-Soraruff, dans le cadre du podcast Notcom: https://notcom.hypotheses.org/4565. Cet entretien aborde le problème de la douleur à l'époque moderne, dans la philosophie cartésienne en particulier (thème du livre Le Fer ou le Feu. Penser la douleur après Descartes, Classiques Garnier, 2025). Traduction anglaise disponible à la lecture p. 7: https://notcom.hypotheses.org/files/2025/02/La-douleur-en-philosophie-SCRIPT.pd
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