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Wyszukujesz frazę "Jackson, N." wg kryterium: Autor


Tytuł:
“Some call Europe, and some call Eneá”: on the origins of the Old Icelandic learned prehistory
Autorzy:
Jackson, Tatjana N.
Tematy:
Knowledge transfer
antiquity
Middle Ages
Old Norse-Icelandic sources
geographical images
toponyms
Pokaż więcej
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Powiązania:
https://bibliotekanauki.pl/articles/2138630.pdf  Link otwiera się w nowym oknie
Opis:
By the 12th century, northern territories were fairly well known in practice, but there was an urgent need to explain the state of this region in written form. In most national narratives, there is an evident tendency to emphasise the similarity of local history with a more significant and more authoritative (Roman or sacred) history (Mortensen 2005). This paper deals with a very specific geographical image-“Europe, or Eneá”-that appears on two “textual maps” by an Icelandic historian of the 13th century, Snorri Sturluson, in his Edda, an Icelandic ars poetica (c. 1220), and in his large compendium of the kings' sagas entitled Heimskringla (c. 1230). The author demonstrates that the toponym Eneá, going back to the ancient hero Aeneas, was formed by Snorri himself as a result of his immersion in the local Icelandic culture and literature, where the Troy story had, by that time, occupied a significant place.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subarcsecond international LOFAR radio images of the M82 nucleus at 118 MHz and 154 MHz
Autorzy:
Jackson, N.
Wucknitz, O.
Beswick, R.
Haverkorn, M.
Miley, G. K.
Deller, A. T.
Jarvis, M. J.
Moldón, J.
Heald, G.
Toribio, M. C.
White, G. J.
Beck, R.
Carozzi, T. D.
Adebahr, B.
Brüggen, M.
Chyży, Krzysztof
Aalto, S.
Brunetti, G.
Röttgering, H. J. A.
Pérez-Torres, M. A.
Dettmar, R.-J.
Morabito, L. K.
Horellou, C.
Martí-Vidal, I.
Varenius, E.
Conway, J. E.
Best, P.
van Driel, W.
Opis:
Context. The nuclear starburst in the nearby galaxy M82 provides an excellent laboratory for understanding the physics of star formation. This galaxy has been extensively observed in the past, revealing tens of radio-bright compact objects embedded in a diffuse free-free absorbing medium. Our understanding of the structure and physics of this medium in M82 can be greatly improved by high-resolution images at low frequencies where the effects of free-free absorption are most prominent. Aims. The aims of this study are, firstly, to demonstrate imaging using international baselines of the Low Frequency Array (LOFAR), and secondly, to constrain low-frequency spectra of compact and diffuse emission in the central starburst region of M82 via high-resolution radio imaging at low frequencies. Methods. The international LOFAR telescope was used to observe M82 at 110−126 MHz and 146−162 MHz. Images were obtained using standard techniques from very long baseline interferometry. images were obtained at each frequency range: one only using international baselines, and one only using the longest Dutch (remote) baselines. Results. The 154 MHz image obtained using international baselines is a new imaging record in terms of combined image resolution (${0.3}′′$) and sensitivity ($\sigma = 0.15 mJy/beam$) at low frequencies (<327 MHz). We detected 16 objects at 154 MHz, six of these also at 118 MHz. Seven objects detected at 154 MHz have not been catalogued previously. For the nine objects previously detected, we obtained spectral indices and emission measures by fitting models to spectra (combining LOFAR with literature data). Four weaker but resolved features are also found: a linear (50 pc) filament and three other resolved objects, of which two show a clear shell structure. We do not detect any emission from either supernova 2008iz or from the radio transient source 43.78+59.3. The images obtained using remote baselines show diffuse emission, associated with the outflow in M82, with reduced brightness in the region of the edge-on star-forming disk.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The LOFAR two-metre sky survey : III. First data release : optical/infrared identifications and value-added catalogue
Autorzy:
Kunert-Bajraszewska, M.
Mingo, B.
McKean, J. P.
Shimwell, T. W.
Chyży, Krzysztof
Harwood, J. J.
Hardcastle, M. J.
Urquhart, S.
Iacobelli, M.
Kondapally, R.
Nisbet, D.
Tasse, C.
White, G. J.
Schwarz, D. J.
Prandoni, I.
Hoeft, M.
Jamrozy, Marek
van Weeren, R. J.
Sabater, J.
Gürkan, G.
Mahatma, V. H.
Duncan, K. J.
Cochrane, R. K.
Miley, G. K.
Morabito, L. K.
Best, P. N.
Mechev, A. P.
Williams, W. L.
Shulevski, A.
Roskowinski, C.
Alegre, L.
Jackson, N.
de Gasperin, F.
Röttgering, H. J. A.
Smith, D. J. B.
Croston, J. H.
Hale, C. L.
Callingham, J. R.
Goyal, Arti
Webster, B.
Beswick, R. J.
Opis:
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120–168 MHz survey of the northern sky with diverse and ambitious science goals. Many of the scientific objectives of LoTSS rely upon, or are enhanced by, the association or separation of the sometimes incorrectly catalogued radio components into distinct radio sources and the identification and characterisation of the optical counterparts to these sources. We present the source associations and optical and/or IR identifications for sources in the first data release, which are made using a combination of statistical techniques and visual association and identification. We document in detail the colour- and magnitude-dependent likelihood ratio method used for statistical identification as well as the Zooniverse project, called LOFAR Galaxy Zoo, used for visual classification. We describe the process used to select which of these two different methods is most appropriate for each LoTSS source. The final LoTSS-DR1-IDs value-added catalogue presented contains 318 520 radio sources, of which 231 716 (73%) have optical and/or IR identifications in Pan-STARRS and WISE.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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