Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Pedagogiczna Biblioteka Wojewódzka im. Komisji Edukacji Narodowej w Lublinie Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaPedagogiczna Biblioteka Wojewódzka im. Komisji Edukacji Narodowej w Lublinie
Zmień bibliotekę

Wyszukujesz frazę "Morabito, L. K." wg kryterium: Autor

  Lista filtrów
Wyrównaj
Wyświetlanie 1-10 z 18
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:
A plethora of diffuse steep spectrum radio sources in Abell 2034 revealed by LOFAR
Autorzy:
Luckin, J.
Bonafede, A.
Sridhar, S. S.
Intema, H. T.
Sabater, J.
Röttgering, H. J. A.
Williams, W. L.
Ferrari, C.
Retana-Montenegro, E.
Orrú, E.
Hoang, D. N.
Heald, G. H.
White, G. J.
Brüggen, M.
Owers, M. S.
Enßlin, T. A.
van Weeren, R. J.
Shimwell, T. W.
Hoeft, M.
Haverkorn, M.
Best, P. N.
Hardcastle, M. J.
de Gasperin, F.
Morabito, L. K.
Horellou, C.
Stroe, A.
McKean, J. P.
Cassano, R.
Brunetti, G.
Pizzo, R.
Chyży, Krzysztof
Opis:
With Low-Frequency Array (LOFAR) observations, we have discovered a diverse assembly of steep spectrum emission that is apparently associated with the intracluster medium (ICM) of the merging galaxy cluster Abell 2034. Such a rich variety of complex emission associated with the ICM has been observed in few other clusters. This not only indicates that Abell 2034 is a more interesting and complex system than previously thought but it also demonstrates the importance of sensitive and high-resolution, low-frequency observations. These observations can reveal emission from relativistic particles which have been accelerated to sufficient energy to produce observable emission or have had their high energy maintained by mechanisms in the ICM. The most prominent feature in our maps is a bright bulb of emission connected to two steep spectrum filamentary structures, the longest of which extends perpendicular to the merger axis for 0.5 Mpc across the south of the cluster. The origin of these objects is unclear, with no shock detected in the X-ray images and no obvious connection with cluster galaxies or AGNs. We also find that the X-ray bright region of the cluster coincides with a giant radio halo with an irregular morphology and a very steep spectrum. In addition, the cluster hosts up to three possible radio relics, which are misaligned with the cluster X-ray emission. Finally, we have identified multiple regions of emission with a very steep spectral index that seem to be associated with either tailed radio galaxies or a shock.
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
Wyświetlanie 1-10 z 18

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies