Sökning: onr:"swepub:oai:DiVA.org:kth-183646" > Deep view of the La...
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000 | 08377naa a2201633 4500 | |
001 | oai:DiVA.org:kth-183646 | |
003 | SwePub | |
008 | 160318s2016 | |||||||||||000 ||eng| | |
009 | oai:DiVA.org:su-128196 | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1836462 URI |
024 | 7 | a https://doi.org/10.1051/0004-6361/2015269202 DOI |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1281962 URI |
040 | a (SwePub)kthd (SwePub)su | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Ackermann, M.4 aut |
245 | 1 0 | a Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations |
264 | c 2016-01-27 | |
264 | 1 | b EDP Sciences,c 2016 |
338 | a print2 rdacarrier | |
500 | a QC 20160319 | |
520 | a Context. The nearby Large Magellanic Cloud (LMC) provides a rare opportunity of a spatially resolved view of an external star-forming galaxy in gamma-rays. The LMC was detected at 0.1-100 GeV as an extended source with CGRO/EGRET and using early observations with the Fermi-LAT. The emission was found to correlate with massive star-forming regions and to be particularly bright towards 30 Doradus. Aims. Studies of the origin and transport of cosmic rays (CRs) in the Milky Way are frequently hampered by line-of-sight confusion and poor distance determination. The LMC offers a complementary way to address these questions by revealing whether and how the gamma-ray emission is connected to specific objects, populations of objects, and structures in the galaxy. Methods. We revisited the gamma-ray emission from the LMC using about 73 months of Fermi-LAT P7REP data in the 0.2-100 GeV range. We developed a complete spatial and spectral model of the LMC emission, for which we tested several approaches: a simple geometrical description, template-fitting, and a physically driven model for CR-induced interstellar emission. Results. In addition to identifying PSR J0540-6919 through its pulsations, we find two hard sources positionally coincident with plerion N 157B and supernova remnant N 132D, which were also detected at TeV energies with H.E.S.S. We detect an additional soft source that is currently unidentified. Extended emission dominates the total flux from the LMC. It consists of an extended component of about the size of the galaxy and additional emission from three to four regions with degree-scale sizes. If it is interpreted as CRs interacting with interstellar gas, the large-scale emission implies a large-scale population of similar to 1-100 GeV CRs with a density of similar to 30% of the local Galactic value. On top of that, the three to four small-scale emission regions would correspond to enhancements of the CR density by factors 2 to 6 or higher, possibly more energetic and younger populations of CRs compared to the large-scale population. An alternative explanation is that this is emission from an unresolved population of at least two dozen objects, such as pulsars and their nebulae or supernova remnants. This small-scale extended emission has a spatial distribution that does not clearly correlate with known components of the LMC, except for a possible relation to cavities and supergiant shells. Conclusions. The Fermi-LAT GeV observations allowed us to detect individual sources in the LMC. Three of the newly discovered sources are associated with rare and extreme objects. The 30 Doradus region is prominent in GeV gamma-rays because PSR J0540-6919 and N 157B are strong emitters. The extended emission from the galaxy has an unexpected spatial distribution, and observations at higher energies and in radio may help to clarify its origin. | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
653 | a gamma rays: galaxies | |
653 | a Magellanic Clouds | |
653 | a cosmic rays | |
700 | 1 | a Albert, A.4 aut |
700 | 1 | a Atwood, W. B.4 aut |
700 | 1 | a Baldini, L.4 aut |
700 | 1 | a Ballet, J.4 aut |
700 | 1 | a Barbiellini, G.4 aut |
700 | 1 | a Bastieri, D.4 aut |
700 | 1 | a Bellazzini, R.4 aut |
700 | 1 | a Bissaldi, E.4 aut |
700 | 1 | a Bloom, E. D.4 aut |
700 | 1 | a Bonino, R.4 aut |
700 | 1 | a Brandt, T. J.4 aut |
700 | 1 | a Bregeon, J.4 aut |
700 | 1 | a Bruel, P.4 aut |
700 | 1 | a Buehler, R.4 aut |
700 | 1 | a Caliandro, G. A.4 aut |
700 | 1 | a Cameron, R. A.4 aut |
700 | 1 | a Caragiulo, M.4 aut |
700 | 1 | a Caraveo, P. A.4 aut |
700 | 1 | a Cavazzuti, E.4 aut |
700 | 1 | a Cecchi, C.4 aut |
700 | 1 | a Charles, E.4 aut |
700 | 1 | a Chekhtman, A.4 aut |
700 | 1 | a Chiang, J.4 aut |
700 | 1 | a Chiaro, G.4 aut |
700 | 1 | a Ciprini, S.4 aut |
700 | 1 | a Cohen-Tanugi, J.4 aut |
700 | 1 | a Cutini, S.4 aut |
700 | 1 | a D'Ammando, F.4 aut |
700 | 1 | a de Angelis, A.4 aut |
700 | 1 | a de Palma, F.4 aut |
700 | 1 | a Desiante, R.4 aut |
700 | 1 | a Digel, S. W.4 aut |
700 | 1 | a Drell, P. S.4 aut |
700 | 1 | a Favuzzi, C.4 aut |
700 | 1 | a Ferrara, E. C.4 aut |
700 | 1 | a Focke, W. B.4 aut |
700 | 1 | a Franckowiak, A.4 aut |
700 | 1 | a Fusco, P.4 aut |
700 | 1 | a Gargano, F.4 aut |
700 | 1 | a Gasparrini, D.4 aut |
700 | 1 | a Giglietto, N.4 aut |
700 | 1 | a Giordano, F.4 aut |
700 | 1 | a Godfrey, G.4 aut |
700 | 1 | a Grenier, I. A.4 aut |
700 | 1 | a Grondin, M. -H4 aut |
700 | 1 | a Guillemot, L.4 aut |
700 | 1 | a Guiriec, S.4 aut |
700 | 1 | a Harding, A. K.4 aut |
700 | 1 | a Hill, A. B.4 aut |
700 | 1 | a Horan, D.4 aut |
700 | 1 | a Johannesson, G.4 aut |
700 | 1 | a Knoedlseder, J.4 aut |
700 | 1 | a Kuss, M.4 aut |
700 | 1 | a Larsson, Stefanu KTH,Tillämpad fysik,Oskar Klein Centre for Cosmoparticle Physics, Alba Nova, Sweden4 aut0 (Swepub:su)slars |
700 | 1 | a Li, L.4 aut |
700 | 1 | a Li, J.4 aut |
700 | 1 | a Li, Liangu KTH,Tillämpad fysik,Oskar Klein Centre for Cosmoparticle Physics, Alba Nova, Sweden4 aut0 (Swepub:kth)- |
700 | 1 | a Longo, F.4 aut |
700 | 1 | a Loparco, F.4 aut |
700 | 1 | a Lubrano, P.4 aut |
700 | 1 | a Maldera, S.4 aut |
700 | 1 | a Martin, P.4 aut |
700 | 1 | a Mayer, M.4 aut |
700 | 1 | a Mazziotta, M. N.4 aut |
700 | 1 | a Michelson, P. F.4 aut |
700 | 1 | a Mizuno, T.4 aut |
700 | 1 | a Monzani, M. E.4 aut |
700 | 1 | a Morselli, A.4 aut |
700 | 1 | a Murgia, S.4 aut |
700 | 1 | a Nuss, E.4 aut |
700 | 1 | a Ohsugi, T.4 aut |
700 | 1 | a Orienti, M.4 aut |
700 | 1 | a Orlando, E.4 aut |
700 | 1 | a Ormes, J. F.4 aut |
700 | 1 | a Paneque, D.4 aut |
700 | 1 | a Pesce-Rollins, M.4 aut |
700 | 1 | a Piron, F.4 aut |
700 | 1 | a Pivato, G.4 aut |
700 | 1 | a Porter, T. A.4 aut |
700 | 1 | a Raino, S.4 aut |
700 | 1 | a Rando, R.4 aut |
700 | 1 | a Razzano, M.4 aut |
700 | 1 | a Reimer, A.4 aut |
700 | 1 | a Reimer, O.4 aut |
700 | 1 | a Romani, R. W.4 aut |
700 | 1 | a Sánchez-Conde, Miguelu Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut0 (Swepub:su)msanc |
700 | 1 | a Schulz, A.4 aut |
700 | 1 | a Sgro, C.4 aut |
700 | 1 | a Siskind, E. J.4 aut |
700 | 1 | a Smith, D. A.4 aut |
700 | 1 | a Spada, F.4 aut |
700 | 1 | a Spandre, G.4 aut |
700 | 1 | a Spinelli, P.4 aut |
700 | 1 | a Suson, D. J.4 aut |
700 | 1 | a Takahashi, H.4 aut |
700 | 1 | a Thayer, J. B.4 aut |
700 | 1 | a Tibaldo, L.4 aut |
700 | 1 | a Torres, D. F.4 aut |
700 | 1 | a Tosti, G.4 aut |
700 | 1 | a Troja, E.4 aut |
700 | 1 | a Vianello, G.4 aut |
700 | 1 | a Wood, M.4 aut |
700 | 1 | a Zimmer, S.u Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut |
710 | 2 | a KTHb Tillämpad fysik4 org |
773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 586q 586x 0004-6361x 1432-0746 |
856 | 4 | u https://www.aanda.org/articles/aa/pdf/2016/02/aa26920-15.pdf |
856 | 4 | u https://doi.org/10.1051/0004-6361/201526920y Fulltext |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183646 |
856 | 4 8 | u https://doi.org/10.1051/0004-6361/201526920 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-128196 |
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