1,725,623 research outputs found
The interstellar medium in the Seyfert galaxy NGC 7172
No full textWe present aperture and surface photometry of the Seyfert galaxy NGC 7172, which is a member of the compact group HCG90, and has a prominent equatorial dust lane. We use the observed colour excess in the dust lane, obtained from broad-band B and V images, to estimate the neutral hydrogen content as MtotH1=2.6×108M☉ and log(MH1/LB)=−1.8. We analyse the flux from NGC 7172 at various wavelengths and discuss the properties of the interstellar medium in the galaxy. Based on the results from surface photometry, and the properties of the interstellar medium, we conclude that the morphology of NGC 7172 is of type S0–Sa
[Bas-Congo Au Katanga, Engine Drawing Card, Sketch No. 7172]
No full textThis engine drawing card was created for Compagnie du chemin de fer du Bas-Congo au Katanga, Class 10-26 1/4 D. Section H-10 1/4 D. Sketch 7172. Copy Spec. 21-F-511
The obscured active nucleus of NGC 7172 as seen BY NuSTAR
No full textПроанализированы свойства рентгеновского излучения активного ядра галактики NGC 7172 типа Сейферт 2 по данным наблюдений космической обсерватории NuSTAR в 2014 г.Проаналізовано властивості рентгенівського випромінювання активного ядра галактики NGC 7172 типу Сейферт 2 за даними спостережень космічної обсерваторії NuSTAR в 2014 році.We analyse the properties of the X-ray emission from Seyfert 2 NGC 7172 which are based on the 32 ks observational data from NuSTAR in 2014.Эта работа использует данные миссии NuSTAR, проекта под руководством Калифорнийского технологического института, разработанной Лабораторией реактивного движения и профинансированной Национальным управлением по аэронавтике и исследованию космического пространства. Это исследование было выполнено с использованием программного обеспечения по обработке данных NuSTAR (NuSTARDAS) разработанным вместе Научным центром ASI (ASDC, Италия) и Калифорнийским технологическим институтом (США). Работа частично поддержана грантом на научные исследования молодых учёных Национальной академии наук Украины (проект № 389Кт Главной астрономической обсерватории НАН Украины)
The obscured active nucleus of NGC 7172 as seen BY NuSTAR
No full textПроанализированы свойства рентгеновского излучения активного ядра галактики NGC 7172 типа Сейферт 2 по данным наблюдений космической обсерватории NuSTAR в 2014 г.Проаналізовано властивості рентгенівського випромінювання активного ядра галактики NGC 7172 типу Сейферт 2 за даними спостережень космічної обсерваторії NuSTAR в 2014 році.We analyse the properties of the X-ray emission from Seyfert 2 NGC 7172 which are based on the 32 ks observational data from NuSTAR in 2014.Эта работа использует данные миссии NuSTAR, проекта под руководством Калифорнийского технологического института, разработанной Лабораторией реактивного движения и профинансированной Национальным управлением по аэронавтике и исследованию космического пространства. Это исследование было выполнено с использованием программного обеспечения по обработке данных NuSTAR (NuSTARDAS) разработанным вместе Научным центром ASI (ASDC, Италия) и Калифорнийским технологическим институтом (США). Работа частично поддержана грантом на научные исследования молодых учёных Национальной академии наук Украины (проект № 389Кт Главной астрономической обсерватории НАН Украины)
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
The X-ray spectrum and variability of the Seyfert 2 galaxy NGC 7172
No full textWe present evidence of flux variability, on bath short (hours) and long (months) time-scales, of the Seyfert 2 galaxy NGC 7172. These results are based on the ASCA observation of NGC 7172 performed in 1996 May. The source was detected at a rather low Aux level, about 3 times fainter than its usual state (including 1 yr before, when it was also observed by ASCA). The source also varied by about 30 per cent during the observation, confirming the presence of a type 1 nucleus in its centre. However, its spectrum appears to be flatter than the typical Seyfert 1 spectrum (in agreement with findings on other Seyfert 2s), posing problems for the unification model unless complex absorption is invoked
BeppoSAX observations of the Seyfert 2 galaxies NGC 7172 and ESO 103-G35
No full textWe investigate the X-ray spectra of the type 2 Seyfert galaxies NGC 7172 and ESO 103-G35, using BeppoSAX observations, separated by approximately one year. We find that the X-ray spectra of both NGC 7172 and ESO 103-G35 can be well fitted using a power-law model with an Fe Kα emission line at 6.4 keV. We did not find any statistically significant evidence for the existence of a reflection component in the X-ray spectra of these two galaxies. The continuum flux has decreased by a factor of approximately 2 during this period, in both objects. However, the spectral index as well as the absorption column have remained constant. We find weak evidence for the decrease of the normalization of the Fe Kα emission line in a similar manner to the continuum in NGC 7172. We also report tentative evidence for a broad Fe Kα line in agreement with previous ASCA observations. In contrast, in the case of ESO 103-G35 the line flux does not change while its width remains unresolved
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
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