Autor: Tanaka, A. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effect of On-Site Coulomb Repulsion on Phase Transitions in Exactly Solved Spin-Electron Model
Autorzy:: Gálisová, L.
Strečka, J.
Tanaka, A.
Verkholyak, T.
Tematy:: 05.50.+q
05.70.Jk
64.60.Cn
64.60.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1534796.pdf Link otwiera się w nowym oknie
Opis:: A hybrid lattice-statistical model on doubly decorated planar lattices, which have localized Ising spins at their nodal lattice sites and two itinerant electrons at each pair of decorating sites, is exactly solved by the use of a generalized decoration-iteration transformation. Our main attention is focused on an influence of the on-site Coulomb repulsion on ground-state properties and critical behavior of the investigated system.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Autorzy:: Agondi, R. C.
Campos, R.
Bouillet, L.
Fomina, D.
Wedi, B.
Ben‐Shoshan, M.
Abuzakouk, M. M.
Santucci, A.
Magerl, M.
Sousa Pinto, B.
Veleiro Perez, B.
Gelincik, A.
Salman, A.
Valle, S.
Guidos Fogelbach, G.
Geng, S.
Kapp, A.
de Montjoye, L.
Godse, K.
Fukunaga, A.
Carne, E.
Popov, T.
Doutre, M. S.
Medina, I.
Calderon, O.
Craig, T.
Tsatsou, F.
Stevanovic, K.
Conlon, N.
Kinaciyan, T.
Choo, K.
Schliemann, S.
Staevska, M.
Zeyen, C.
Kuprys‐Lipinska, I.
Christoff, G.
Ogueta Canales, I.
Yosipovitch, G.
Pereira, M. P.
Riedl, M.
Maruta, C. W.
Marzano, A. V.
Pigatto, P. D.
Karam, M.
Çetinarslan, T.
Elmariah, S.
Stingeni, L.
Alangari, A. A.
Gonçalo, M.
Xepapadaki, P.
Rosmaninho, I.
Cerecedo, I.
Zhao, Z.
Criado, P.
Buttgereit, T.
Micallef, D.
Sheikh, F.
Brockow, K.
Heuer, R.
Hide, M.
Nast, A.
Yap, E. W. Y.
Ertaş, R.
Saleh Al Sabbagh, F.
Konstantinou, G. N.
Valerieva, A.
Toubi, E.
De Arruda Chaves, E.
Pawankar, R.
Darlenski, R.
Sahiner, U. M.
Ciupka, K.
Guillod, R.
Giménez‐Arnau, A. M.
Su Küçük, Ö.
Grattan, C.
Bindslev‐Jensen, C.
Kumaran, M. S.
Danilycheva, I.
Podder, I.
Chkhikvadze, N.
Sabato, V.
Costa, C.
Al‐Tamemi, S.
Pennitz, A.
Lazaridou, E.
Kulthanan, K.
Francescantonio, I.
Grosber, M.
Sussman, G.
Hoetzenecker, W.
Labrador, M.
Kolacinska‐Flont, M.
Doorn, M. v.
Metz, M.
Rutkowski, K.
Kolkhir, P.
Turk, M.
Elkhalifa, S.
Alonso Bello, C. D.
Larenas‐Linnemann, D.
Abdul Hameed Ansari, Z.
Bonnekoh, H.
Ratti Sisa, H. A.
Brzoza, Z.
Munoz, M.
Guilarte, M.
Schmid‐Grendelmeier, P.
Szegedi, A.
Thomsen, S. F.
Peter, J.
Bangert, C.
Gotua, M.
Shendi, H.
Xiang, Y.
Alves Marcelino, J.
Caballero, T.
Werner, R. N.
Oude Elberink, H. N. G.
Galvan Calle, C. A.
Zuberbier, T.
Soria, A.
Staubach, P.
Recto, M.
Fok, J. S.
Rosario Filho, N.
Parisi, C.
Teovska Mitrevska, N.
Vestergaard, C.
Zalewska‐Janowska, A. Z. J.
Li, P. H.
Ye, Y.‐M.
Ress, K.
Rudenko, M.
Kocatürk, E.
Özkaya, E.
Al Wahshi, H.
Chong‐Neto, H. J.
Khoshkhui, M.
Orfali, R. L.
Okas, T.‐L.
Fachini Jardim Criado, R.
Asero, R.
Altrichter, S.
Sonomjamts, M.
Takahagi, S.
Chu, C.‐Y.
Kessel, A.
Vadasz, Z.
Alhameli, H.
Arnaout, R.
Kang, H.‐R.
Nakonechna, A.
Vera Ayala, C. E.
Makris, M.
Rukhadze, M.
Kim, B.
El‐Shanawany, T.
Porębski, Grzegorz
Salvo, F.
Latysheva, E.
Kosnik, M.
Ballmer‐Weber, B.
Boccon‐Gibod, I.
Agcaoili‐De Jesus, M. S.
Garcia, E.
Cancian, M.
Katelaris, C. H.
Krasowska, D.
Al‐Ahmad, M.
Vieira, R. J.
Yong, P.
Hamelmann, E.
Hayama, K.
Kaplan, A.
Meshkova, R.
Pyatilova, P.
Inomata, N.
Netchiporouk, E.
Stephan, M.
Sanchez, J.
Bulkhi, A.
Ebo, D.
Bulatović Ćalasan, M.
Nasr, I.
Tanaka, A.
Serpa, F.
Ensina, L. F.
Hawkes, J.
Saini, S.
Ferrucci, S.
Stobiecki, Marcin
Bizjak, M.
Mortz, C. G.
Lippert, U.
Sekerel, B. E.
Ridge, K.
Alshareef, S.
Bygum, A.
Ritchie, C.
Aquilina, S.
Nettis, E.
Mohammed Ali, R.
Bernstein, J.
Castor, M. A.
Abdul Latiff, A. H.
Kasperska‐Zajac, A.
Nieto, S.
Siebenhaar, F.
Larco, J. I.
Gáspár, K.
Cherrez‐Ojeda, I.
Bauer, A.
Fouda, G.
Petkova, E.
Ferrer, M.
Fonacier, L.
Ramon, G. D.
Araújo, M.
Sheikh, J.
Lima, H.
Du‐Thanh, A.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Preferentially Oriented Growth of L1₀ FePt on Si Substrate
Autorzy:: Kaushik, N.
Sharma, P.
Tanaka, S.
Makino, A.
Esashi, M.
Tematy:: 75.20.En
75.50.Ss
75.50.Vv
75.70.Ak; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1387798.pdf Link otwiera się w nowym oknie
Opis:: Tilting the magnetic easy axis of L1₀ FePt and/or introducing a magnetic buffer layer is most effective in realizing the L1₀ based magnetic recording media. Here we report on preferentially oriented growth of L1₀ FePt with tilted magnetic easy axis. FePt films of thickness up to 170 nm were deposited on Si substrate with a soft magnetic underlayer of glassy FeSiB, FeSiBP and CoFeTaB. Effects of processing conditions on the structural and magnetic properties were studied. A polycrystalline growth of FePt (i.e. mixed orientation) was observed with the underlayer of FeSiB and FeSiBP, but CoFeTaB promotes preferentially oriented growth along (111) crystallographic direction. Compared to FePt films grown on Si substrate, coercivity $(H_{c})$ reduces significantly with the introduction of soft magnetic underlayer. The magnetic easy axis of (111) L1₀ FePt is tilted 36 out of plane and it is very promising for tilted magnetic recording media.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Investigation of low temperature plasma capabilities to modify the structure and function of bio-polymers
Autorzy:: Motrescu, I.
Hara, T.
Ogino, A.
Tanaka, S.
Fujiwara, T.
Kawagishi, H.
Kodani, S.
Popa, G.
Nagatsu, M.
Tematy:: biopolymers
biomolecules
low temperature plasma
modification
plasma processing; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/385288.pdf Link otwiera się w nowym oknie
Opis:: The possibility to modify biopolymers using low temperature plasma is investigated. Two types of plasma are employed in this study: an atmospheric pressure plasma and a low pressure microwave plasma. In both cases changes of the structure and function of the exposed molecules are reported, the effects being stronger for the low-pressure plasma irradiation.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Six years of Fermi-LAT and multi-wavelength monitoring of the broad-line radio galaxy 3c 120 : jet dissipation at sub-parsec scales from the central engine
Autorzy:: Gurwell, M. A.
Cheung, C. C.
Tahara, M.
Inoue, Y.
Kataoka, J.
Stawarz, Łukasz
Tanaka, Y. T.
Fukazawa, Y.
Doi, A.
Itoh, R.
Opis:: We present multi-wavelength monitoring results for the broad-line radio galaxy 3C 120 in the MeV/GeV, sub-millimeter, and 43 GHz bands over 6 yr. Over the past 2 yr, the Fermi-Large Area Telescope sporadically detected 3C 120 with high significance and the 230 GHz data also suggest an enhanced activity of the source. After the MeV/GeV detection from 3C 120 in MJD 56240–56300, 43 GHz Very Long Baseline Array (VLBA) monitoring revealed a brightening of the radio core, followed by the ejection of a superluminal knot. Since we observed the $\gamma$-ray and VLBA phenomena in temporal proximity to each other, it is naturally assumed that they are physically connected. This assumption was further supported by the subsequent observation that the 43 GHz core brightened again after a $\gamma$-ray flare occurred around MJD 56560. We can then infer that the MeV/GeV emission took place inside an unresolved 43 GHz core of 3C 120 and that the jet dissipation occurred at sub-parsec distances from the central black hole (BH), if we take the distance of the 43 GHz core from the central BH as $\sim$ 0.5 pc, as previously estimated from the time lag between X-ray dips and knot ejections. Based on our constraints on the relative locations of the emission regions and energetic arguments, we conclude that the $\gamma$ rays are more favorably produced via the synchrotron self-Compton process, rather than inverse Compton scattering of external photons coming from the broad line region or hot dusty torus. We also derived the electron distribution and magnetic field by modeling the simultaneous broadband spectrum.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Suzaku X-ray imaging of the extended lobe in the giant radio galaxy NGC 6251 associated with the Fermi-LAT source 2FGL J1629.4+8236
Autorzy:: Cheung, C. C.
Stawarz, Łukasz
Takeuchi, Y.
Takahashi, Y.
Tanaka, Y.
Kataoka, J.
Takahashi, T.
Nakamori, T.
Celotti, A.
Maeda, K.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Supernova model discrimination with Hyper-Kamiokande
Autorzy:: Mineev, O.
Minakata, H.
Nakayoshi, K.
Gialanella, L.
Zaldivar, B.
Kato, A.
Kim, S. Y.
Ashida, Y.
Wilkes, R. J.
Garode, S.
Feng, J.
Vilela, C.
Pac, M. Y.
Karlen, D.
Suganuma, T.
Kajita, T.
Paganini, P.
Lu, X.
Gramegna, F.
Nakadaira, T.
Yano, T.
Ostrowski, Michał
Vivolo, D.
Matusiak, M.
Fiorillo, G.
Mazzucato, E.
Finch, A.
Hiraide, K.
Navarro-Garcia, B.
Mondal, T.
Ikeda, M.
Insler, J.
Kudenko, Y.
Sato, K.
Kumita, T.
Malinský, M.
Lamers James, M.
Nascimento Machado, L.
Wronka, S.
Ohta, K.
Iijima, T.
Gornea, R.
Maret, L.
Jeon, S. H.
Lim, I. T.
Fiorentini, A.
Matsumoto, R.
O'Connor, E.
Coleman, J.
Harada, M.
Kikawa, T.
Danilov, M.
Kearns, E.
Yamaguchi, Y.
Magaletti, L.
Cartwright, S. L.
Nishimura, Y.
Jang, J. S.
Radicioni, E.
Vasseur, G.
Barr, G.
Porwit, K.
Nakagiri, K.
La Commara, M.
Learned, J. G.
Hirota, S.
Marchi, T.
Mollo, C. M.
Di Palma, I.
Sakashita, K.
Izmaylov, A.
El Hedri, S.
Tsukamoto, T.
Ochoa-Ricoux, J. P.
Takemoto, Y.
Medhi, A.
Bonavera, L.
Hartz, M.
Pozimski, J.
Zakrzewski, T.
Chabera, M.
Kinoshita, T.
Stankevich, K. L.
Payne, D.
Renner, J.
Doyle, T. A.
Sashima, I.
Matsuno, S.
Takenaka, A.
Loverre, P.
Wachala, T.
Gumplinger, P.
Booth, N.
Onishchuk, Y.
Ichikawa, A. K.
Ovsiannikova, T.
Suzuki, A. T.
Kameda, J.
Sano, S.
Yoo, J.
Nakai, S.
Hartfiel, B.
Jiang, M.
Moon, C. S.
Pari, M.
Jamieson, B.
Hoshina, K.
Nakajima, Y.
Feusels, T.
Ruggles, C.
Drapier, O.
Prouse, N. W.
Kurjata, R.
Mefodiev, A.
Sekiguchi, T.
Aushev, V.
Labarga, L.
Blanchet, A.
Uchida, Y.
Berardi, V.
Yokoyama, M.
Evangelisti, A.
Kormos, L. L.
Yeum, D. N.
Wendell, R. A.
Iacob, F.
Ogawa, N.
O'Sullivan, E.
Yamamoto, K.
Itow, Y.
Boyd, S. B.
Pasternak, J.
Ruggeri, A. C.
Ozaki, H.
Boiano, A.
Smy, M. B.
Roth, S.
Kim, S. B.
Ferrazzi, B.
Xie, Z.
Xin, T.
Stellacci, S. M.
Fukuda, Y.
Kouzakov, K. A.
Kim, J. H.
Sobczyk, J.
Drakopoulou, E.
Miki, S.
De la Fuente, E.
Munteanu, L.
Yu, M.
Hernando-Morata, J. A.
Longhin, A.
Orozco-Luna, F.
Zarnecki, G.
Korzenev, A.
Spina, R.
Lamoureux, M.
Mongelli, M.
Tzanov, M.
Ioannisian, A.
Cafagna, F. S.
Mermod, P.
González-Nuevo, J.
Carroll, A.
Garde, C.
Grella, G.
Bernardini, E.
Palladino, V.
Kravchuk, L.
Boschi, T.
Playfer, S.
Tanaka, M.
Suvorov, S.
Rountree, S. D.
Aihara, H.
Buchowicz, A.
Ameli, F.
Akutsu, R.
Hassani, S.
Mahn, K.
Fernández-Martinez, E.
Cicerchia, M.
Barker, G. J.
Martin, D.
Idrissi Ibnsalih, W.
Anghel, I.
Fernandez, P.
Jonsson, P.
Cook, L.
Ishida, T.
Wark, D.
Martin, J. F.
Borjabad, S.
Checchia, C.
Seo, J. W.
Lindner, T.
Pavin, M.
Mora, F. J.
Miura, M.
Mellet, L.
Russo, S.
Sobel, H. W.
Taketa, A.
Ziembicki, M.
Khotjantsev, A.
Nakahata, M.
Di Meo, P.
Fujii, Y.
Daz Lopez, G.
Riccio, C.
Wilson, J. R.
Ito, S.
Marinelli, A.
Jang, H. I.
Shimizu, I.
Collazuol, G.
Finley, C.
Niewczas, K.
Gorin, A.
Berns, L.
Antonova, M.
Guigue, M.
Densham, C. J.
Sarmah, P.
Poutissou, J. -M.
Bozza, C.
McGrew, C.
Calabria, N. F.
Ito, H.
Bhadra, S.
Peña-Garay, C.
Shiozawa, M.
Skwarczynski, K.
Mariani, C.
Kakuno, H.
Magar, K.
Konaka, A.
Galinski, G.
Ludovici, L.
Taani, M.
Yen, S.
Friend, M.
Shaykina, A.
Cuen-Rochin, S.
Soler, F. J. P.
Jakkapu, M.
Mezzetto, M.
Murase, K.
Pointon, B. W.
Miller, E. W.
Marti, Ll.
Shin, C. D.
Dumarchez, J.
Kryukov, A. P.
Kasperek, J.
Ishidoshiro, K.
Nakamura, KI.
Pastore, C.
Inomoto, M.
Gomez-Cadenas, J. J.
Suárez Gómez, S. L.
Kisiel, J.
Lee, J.
Popov, A.
Patel, D. A.
Vijayvargi, A.
Ellis, J.
Joo, K. K.
Khabibullin, M.
Suzuki, Y.
Grassi, M.
Minamino, A.
Svoboda, R.
Malek, M.
Walker, J.
Zalipska, J.
Menjo, H.
Rubbia, A.
Fitton, M.
Rajda, P. J.
Shinoki, M.
Valentino, V.
Tada, M.
Santucci, G.
Horiuchi, S.
Giganti, C.
Mehta, P.
Seo, S. H.
Kotsar, Y.
Vyalkov, M. M.
Holin, A.
Choubey, S.
Studenikin, A. I.
Quiroga, A. A.
Esmaili, A.
Ishino, H.
Bronner, C.
Kobayashi, T.
Bravo-Berguño, D.
Okumura, K.
Radics, B.
Koshio, Y.
Cao, S.
Ishitsuka, M.
Long, K. R.
Sgalaberna, D.
Makida, Y.
Vagins, M. R.
Monrabal, F.
Di Lodovico, F.
Bolognesi, S.
Bose, D.
Kazarian, N.
Kalaczynski, P.
Pinzon Guerra, E.
Esteve, R.
Kataoka, Y.
Ogitsu, T.
Takeuchi, Y.
Stopa, K.
Kano, Y.
Parsa, S.
Asaoka, Y.
Deshmukh, N.
Blaszczyk, F. d. M.
Hastings, N. C.
Quilain, B.
Suzuki, S. Y.
Koga, M.
Litchfield, R. P.
Richards, B.
Feely, M.
Laveder, M.
McCarthy, M.
Tortone, G.
Rondio, E.
Migliozzi, P.
Kwak, K.
Inoue, K.
Przewlocki, P.
Abe, K.
Naseby, C. E. R.
Nakaya, T.
Pronost, G.
Takhistov, V.
Metelko, C.
Bellato, M.
Popov, B.
Rychter, A.
de Perio, P.
Sonoda, Y.
Nakamura, H.
Frankiewicz, K.
Bian, J.
Batkiewicz-Kwasniak, M.
Hill, J.
Nicholls, T.
Yershov, N.
Nakayama, S.
Lagoda, J.
Santos, J. D.
Spisso, B.
Pidcott, C.
Roskovec, B.
Bubak, A.
Tomatani-Sánchez, A. K.
Zsoldos, S.
Izumi, N.
Sinnis, G.
Moharana, R.
Sánchez, M. L.
Bravar, A.
Dunne, P.
Ferrario, P.
Scott, M.
Obrebski, W.
Retiere, F.
Kikec, M.
Dergacheva, A.
Alekseev, I.
Gonin, M.
Gao, J.
Bandac, I.
Hadley, D. R.
Samani, S.
Anthony, L. H. V.
Rott, C.
O'Keeffe, H. M.
Noah, E.
Skrobova, N.
Migenda, J.
Hayato, Y.
Araya, A.
Nakamura, K.
Eklund, L.
Suwa, Y.
Tanaka, H. I.
Leitner, R.
Fedotov, S.
Ryu, D.
Garfagnini, A.
Kowalik, K. L.
De Rosa, G.
King, S.
Xia, J.
Blondel, A.
Kutter, T.
Spradlin, P.
Bernard, L.
Chakraborty, S.
Emery, S.
Ospina, N.
Pastuszak, G.
Bergevin, M.
Catanesi, M. G.
Koch, L.
Kolev, N.
Ziętara, Krzysztof
Jo, H. S.
Nagao, Y.
Lawe, M.
Okamoto, K.
Ballester, F.
Maekawa, Y.
Iwamoto, K.
Cebriàn, S.
Ricciardi, G.
Zaremba, K.
Mueller, Th. A.
Rescigno, M.
Moon, D. H.
Matsubara, T.
Dziewiecki, M.
Herrero, V.
Oyama, Y.
Zito, M.
Cowan, G.
Tanaka, H.
Dealtry, T.
Koerich, L.
Stawarz, Łukasz
Yu, I.
Jenkins, S. J.
Yonenaga, M.
Lavitola, L.
Needham, M.
Calvo-Mozota, J. M.
Buizza Avanzini, M.
Ali, A.
Moriyama, S.
Sanchez, M. C.
Adrich, P.
Thiesse, M.
Tsui, K. M.
Vinning, W. G. S.
Yanagisawa, C.
Kuze, M.
Brown, L.
Sánchez, F.
Wilking, M. J.
Klekotko, A.
Gousy-Leblanc, V.
Lezaun, V.
McElwee, J.
Choi, J. H.
O'Sullivan, L.
Mitra, A.
Takeda, A.
Thompson, L. F.
Tanaka, H. A.
Mijakowski, P.
Kim, J. Y.
Paolone, V.
Sekiya, H.
Nova, F.
Seiya, Y.
Mine, S.
Shan, Z.
Nakano, Y.
Katori, T.
Barbi, M.
Marzec, J.
Rose, H. J.
Posiadala-Zezula, M.
McCauley, N.
Wascko, M. O.
Oshlianskyi, A.
Nugent, J. C.
Martens, K.
Nunokawa, H.
Svirida, D.
Hultqvist, K.
Shaikhiev, A.
Devi, M. M.
Vladisavljevic, T.
Tashiro, T.
Toledo, J.
Vogelaar, R. B.
Izumiyama, S.
Valder, S.
Opis:: Core-collapse supernovae are among the most magnificent events in the observable universe. They produce many of the chemical elements necessary for life to exist and their remnants—neutron stars and black holes—are interesting astrophysical objects in their own right. However, despite millennia of observations and almost a century of astrophysical study, the explosion mechanism of core-collapse supernovae is not yet well understood. Hyper-Kamiokande is a next-generation neutrino detector that will be able to observe the neutrino flux from the next galactic core-collapse supernova in unprecedented detail. We focus on the first 500 ms of the neutrino burst, corresponding to the accretion phase, and use a newly-developed, high-precision supernova event generator to simulate Hyper-Kamiokande's response to five different supernova models. We show that Hyper-Kamiokande will be able to distinguish between these models with high accuracy for a supernova at a distance of up to 100 kpc. Once the next galactic supernova happens, this ability will be a powerful tool for guiding simulations toward a precise reproduction of the explosion mechanism observed in nature.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Extreme blazars studied with Fermi-LAT and Suzaku : 1ES 0347–121 and blazar candidate HESS J1943+213
Autorzy:: Finke, J.
Wagner, S. J.
Dubus, G.
Fukazawa, Y.
Stawarz, Łukasz
DeNaurois, M.
Cheung, C. C.
Tanaka, Y. T.
Dermer, C. D.
Bamba, A.
Kataoka, J.
Thompson, D. J.
Opis:: We report on our study of high-energy properties of two peculiar TeV emitters: the "extreme blazar" 1ES 0347–121 and the "extreme blazar candidate" HESS J1943+213 located near the Galactic plane. Both objects are characterized by quiescent synchrotron emission with flat spectra extending up to the hard X-ray range, and both were reported to be missing GeV counterparts in the Fermi Large Area Telescope (LAT) two-year Source Catalog. We analyze a 4.5 yr accumulation of the Fermi -LAT data, resulting in the detection of 1ES 0347–121 in the GeV band, as well as in improved upper limits for HESS J1943+213. We also present the analysis results of newly acquired Suzaku data for HESS J1943+213. The X-ray spectrum is well represented by a single power law extending up to 25 keV with photon index 2.00 $\pm$ 0.02 and a moderate absorption in excess of the Galactic value, which is in agreement with previous X-ray observations. No short-term X-ray variability was found over the 80 ks duration of the Suzaku exposure. Under the blazar hypothesis, we modeled the spectral energy distributions of 1ES 0347–121 and HESS J1943+213, and we derived constraints on the intergalactic magnetic field strength and source energetics. We conclude that although the classification of HESS J1943+213 has not yet been determined, the blazar hypothesis remains the most plausible option since, in particular, the broadband spectra of the two analyzed sources along with the source model parameters closely resemble each other, and the newly available Wide-field Infrared Survey Explorer and UKIRT Infrared Deep Sky Survey data for HESS J1943+213 are consistent with the presence of an elliptical host at the distance of approximately ~600 Mpc.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: "Fermi" Large Area Telescope detection of two very-high-energy (E > 100 GeV) $\gamma$-ray photons from the z = 1.1 blazar PKS 0426-380
Autorzy:: Stawarz, Łukasz
Chekhtman, A.
Ajello, M.
Ohno, M.
Wood, D. L.
Paneque, D.
Thompson, D. J.
Fukazawa, Y.
Mizuno, T.
Dermer, C. D.
Cheung, C. C.
Inoue, Y.
Tanaka, Y. T.
Opis:: We report the Fermi Large Area Telescope (LAT) detection of two very-high-energy (VHE, E > 100 GeV) gamma-ray photons from the directional vicinity of the distant (redshift, $\mathit{z}$ = 1.1) blazar PKS 0426–380. The null hypothesis that both the 134 and 122 GeV photons originate from unrelated sources can be rejected at the 5.5$\sigma$ confidence level. We therefore claim that at least one of the two VHE photons is securely associated with PKS 0426–380, making it the most distant VHE emitter known to date. The results are in agreement with recent Fermi-LAT constraints on the extragalactic background light (EBL) intensity, which imply a $\mathit{z} 1 \simeq$ horizon for $\simeq$ 100 GeV photons. The LAT detection of the two VHE gamma-rays coincided roughly with flaring states of the source, although we did not find an exact correspondence between the VHE photon arrival times and the flux maxima at lower gamma-ray energies. Modeling the gamma-ray continuum of PKS 0426–380 with daily bins revealed a significant spectral hardening around the time of the first VHE event detection (LAT photon index $\Gamma \simeq $1.4) but on the other hand no pronounced spectral changes near the detection time of the second one. This combination implies a rather complex variability pattern of the source in γ-rays during the flaring epochs. An additional flat component is possibly present above several tens of GeV in the EBL-corrected Fermi-LAT spectrum accumulated over the ~8 month high state.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Giant lobes of Centaurus a radio galaxy observed with the Suzaku X-ray satellite
Autorzy:: Cheung, C. C.
Madejski, G.
Reville, B.
Feain, I. J.
Siemiginowska, A.
Simionescu, A.
Kataoka, J.
Hardcastle, M. J.
Ostrowski, Michał
Takahashi, T.
Takeuchi, Y.
Werner, N.
Tanaka, Y. T.
Stawarz, Łukasz
Fukazawa, Y.
Gandhi, P.
Takei, Y.
O’Sullivan, S. P.
Opis:: We report on Suzaku observations of selected regions within the southern giant lobe of the radio galaxy Centaurus A. In our analysis we focus on distinct X-ray features detected with the X-ray Imaging Spectrometer within the range 0.5-10 keV, some of which are likely associated with fine structure of the lobe revealed by recent high-quality radio intensity and polarization maps. With the available photon statistics, we find that the spectral properties of the detected X-ray features are equally consistent with thermal emission from hot gas with temperatures kT > 1 keV, or with a power-law radiation continuum characterized by photon indices $\Gamma \sim 2.0 \pm 0.5$. However, the plasma parameters implied by these different models favor a synchrotron origin for the analyzed X-ray spots, indicating that a very efficient acceleration of electrons up to $_{\sim }^{>} 10$ TeV energies is taking place within the giant structure of Centaurus A, albeit only in isolated and compact regions associated with extended and highly polarized radio filaments. We also present a detailed analysis of the diffuse X-ray emission filling the whole field of view of the instrument, resulting in a tentative detection of a soft excess component best fitted by a thermal model with a temperature of $\mathit{kT} \sim 0.5$ keV. The exact origin of the observed excess remains uncertain, although energetic considerations point to thermal gas filling the bulk of the volume of the lobe and mixed with the non-thermal plasma, rather than to the alternative scenario involving a condensation of the hot intergalactic medium around the edges of the expanding radio structure. If correct, this would be the first detection of the thermal content of the extended lobes of a radio galaxy in X-rays. The corresponding number density of the thermal gas in such a case is ng $\mathit{n_{g}} \sim 10^{-4} \mathrm{cm}^{-3}$, while its pressure appears to be in almost exact equipartition with the volume-averaged non-thermal pressure provided by the radio-emitting electrons and the lobes' magnetic field. A prominent large-scale fluctuation of the Galactic foreground emission, resulting in excess foreground X-ray emission aligned with the lobe, cannot be ruled out. Although tentative, our findings potentially imply that the structure of the extended lobes in active galaxies is likely to be highly inhomogeneous and non-uniform, with magnetic reconnection and turbulent acceleration processes continuously converting magnetic energy to internal energy of the plasma particles, leading to possibly significant spatial and temporal variations in the plasma \beta parameter around the volume-averaged equilibrium condition \beta.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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