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Tytuł:
Compact radio sources in the GB/GB2 sample : I. 10-GHz and 40-GHz observations
Autorzy:
Machalski, Jerzy
Inoue, M.
Opis:
A complete subsample of compact radio sources selected from the flux- density-limited GB/GB2 sample has been observed at 10 and 40 GHz with the NRO 45-m radiotelescope. The resulting high-frequency spectra, together with existing data for these sources, enable us to distinguish different morphological types, i.e. flat-spectrum core-dominated sources, possible strongly projected lobe-dominated doubles and steep-spectrum compact (SSC) sources. Correlations between spectrum, visibility function, structure and optical type are analysed and discussed. SSC sources constitute about 5-8 per cent of the complete (compact + extended) GB/GB2 sample. The SSC phenomenon is evidently unrelated to optical identification of the sources. About 85 per cent of the sample consist of sources with projected linear sizes of about 1-10 kpc. The remaining 15 per cent are probably very compact sources with sizes from 1 kpc to tenths of a parsec. They are characterized by a self-absorbed 'humped' spectrum, and are candidates for future VLBA or VLBI observations.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Job Redesign Needs for Aged Workers
Autorzy:
Kawakami, M.
Inoue, F.
Ohkubo, T.
Ueno, T.
Tematy:
ergonomics
job redesign
work intensity
assembly operation
labor productivity
ergonomia
wydajność pracy
montaż
starsi pracownicy
Pokaż więcej
Wydawca:
Centralny Instytut Ochrony Pracy
Powiązania:
https://bibliotekanauki.pl/articles/90100.pdf  Link otwiera się w nowym oknie
Opis:
The aim of this paper is to explore and present a proposal for redesigning elements of the workplace for agech workers. The method of research was to observe, record, and measure the actions of sitting workers performing assembly operations on electrical products in the Kani Plant Nagoya Works of Mitsubishi Electric Co. (Japan). The evaluation index used in the experiment was obtained by measuring time motion elements, cycle time per product, and motion velocity waves of elderly workers. Those motion characteristics were then compared to the motion characteristics of young workers. The results led to job redesign elements being identified to reduce handling factors of high difficulty for aged workers and to the necessity to consider a coefficient of correction in Method Time Measurement (MTM) according to differences in the manufactured object’s weight.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Mo-Ni Alloys by X-Ray Spectroscopies
Autorzy:
Ławniczak-Jabłońska, K.
Heinonen, M.
Inoue, J.
Tohyama, T.
Tematy:
71.20.Cf
78.70.En
79.60.-i
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1924333.pdf  Link otwiera się w nowym oknie
Opis:
Band structure investigations of the random MoNi$\text{}_{4}$ and MoNi$\text{}_{3}$ alloys, performed by emission and photoelectron spectroscopy, is reported. The X-ray emission and X-ray photoelectron spectra allowed to study the occupied valence band states below Fermi level. These techniques gave the full description of changes in the density of valence electron states distribution due to substitution of Mo atoms into the fcc Ni lattice up to 25 at%. The analysis of the emission and photoelectron spectra led to clear distinction between the changes in spectra caused by density of states structure and by additional effects involved in creation of the particular spectra. The experimental data are compared with the density of states calculated using coherent potential approximation and linear muffin-tin orbital methods.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simple local navigation system inspired by hippocampal function and its autonomous mobile robot implementation
Autorzy:
Miki, T.
Hayashi, H.
Goto, Y.
Watanabe, M.
Inoue, T.
Tematy:
human-like local navigation
sequence learning
entorhino-hippocampal system
autonomous mobile robot
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:
https://bibliotekanauki.pl/articles/384203.pdf  Link otwiera się w nowym oknie
Opis:
We propose a practical simple local navigation system inspired by the sequence learning mechanism of the entorhino-hippocampal system. The proposed system memorizes a route as sequences of landmarks in the same way humans do. The proposed local navigation system includes a local route memory unit, landmark extraction unit, and learning-type matching unit. In the local route memory unit, the concept of the sequence learning mechanism of the entorhino-hippocampal system is implemented using a fully connected network, while a sequence of landmarks is embedded in the connection matrix as the local route memory. This system has two operation modes: learning and recall modes. In learning mode, a sequence of landmarks, i.e. a local route, is represented by enhanced loop connections in the connection matrix. In recall mode, the system traces the stored route comparing current landmarks with the stored landmarks using the landmark extraction and learning-type matching units. The system uses a prospective sequence to match the current landmark sequence with the recalled one. Using a prospective sequence in the route comparison allows confirmation of the correct route and deals with any slight change in the current sequence of landmarks. A certainty index is also introduced for judging the validity of the route selection. We describe a basic update mechanism for the stored landmark sequence in the case of a small change in the local route memory. The validity of the proposed system is confirmed using an autonomous mobile robot with the proposed navigation system.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomedical application of soft X-ray microscopy with special reference to spectromicroscopy
Autorzy:
Ito, A.
Inoue, T.
Kado, M.
Ohigashi, T.
Tone, S.
Shinohara, K.
Tematy:
87.59.-e
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1065144.pdf  Link otwiera się w nowym oknie
Opis:
Soft X-ray microscopy has great advantages over other types of microscopy on the observation of hydrated specimens at high spatial resolution below 100 nm, and on the elemental and molecular mapping using absorption characteristics. These advantages are particularly suitable for biomedical applications. A possible problem associated with observation of specimens at high spatial resolution in a hydrated environment is described and a strategy to overcome the problem is presented. The latter part of the present report deals with spectromicroscopy to obtain molecular distribution in biological specimens. DNA and protein distributions in isolated nuclei are examined following to the progression of apoptosis at high resolution, and the oxidation product is visualized in human hair in relation to calcium content.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and application of ultra-long multi-walled carbon nanotube
Autorzy:
Shimizu, S.
Okada, M.
Inoue, Y.
Neo, Y.
Kume, H.
Aoki, T.
Mimura, H.
Tematy:
CNT
CVD
yarn
FeCl2
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:
https://bibliotekanauki.pl/articles/385267.pdf  Link otwiera się w nowym oknie
Opis:
We found the easy and efficient synthesis method of the vertically aligned ultralong multi-walled nanotubes using iron chloride powder. The 2.1-mm-long bulk nanotubes can be grown by conventional thermal chemical vapor deposition on bare quartz surface with the single gas flow of acetylene for 20 min. In addition to the high growth rate, the bulk of carbon nanotubes is easily spun into the yarn by pulling it out, and the present method also provides the coating ability with nanotubes as a new functionality of this nanomaterial. Š 2008 American Institute of Physics.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coarse Aggregate Recycling by Pulsed Discharge Inside of Concrete
Autorzy:
Inoue, S.
Araki, J.
Aoki, T.
Maeda, S.
Iizasa, S.
Takaki, M.
Wang, D.
Namihira, T.
Shigeishi, M.
Ohtsu, M.
Akiyama, H.
Tematy:
52.80.Wq
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1807935.pdf  Link otwiera się w nowym oknie
Opis:
In Japan, the treatment of waste concrete scraps has been one of the environmental issues. Therefore, new application using pulsed power discharge has been developed as the recycling method of the coarse aggregates from the waste concrete scraps. In the work, the dependences of the quality of the recycled coarse aggregate by the repetitive pulsed discharge treatments on the consumption energy were investigated. As the results, it was clear that the quality of the recycled coarse aggregate could be controlled by the number of discharge treatments. The recycled coarse aggregate, which satisfied class H under the regulations of Japan Industrial Standard (JIS A5005 and JIS A5021), was produced with the smallest consumption energy when the discharged energy from 0.02 μF of capacitor charged up to 400 kV applied to the waste concrete scraps during single discharge treatment.
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Tytuł:
Broadband multi-wavelength properties of M87 during the 2018 EHT campaign including a very high energy flaring episode
Autorzy:
Nickel, L.
Vos, J.
Errando, M.
Niinuma, K.
Maldera, S.
Saturni, F. G.
Satapathy, K.
Brissenden, R.
Impellizzeri, C. M. V.
Issaoun, S.
Kubo, H.
Roache, E.
Moriyama, K.
Berenji, B.
Georgiev, B.
Patel, N.
Lindfors, E.
Kaaret, P.
Foote, J.
Leone, F.
Ceribella, G.
Hadasch, D.
Johnson, M. D.
Hahn, A.
Kluźniak, W.
Negro, M.
Godinović, N.
Okumura, A.
Kim, D.-J.
Barres de Almeida, U.
Chan, C.-k.
Biland, A.
Moran, J. M.
Abhishek, A.
Green, D.
Silvestri, G.
de Naurois, M.
Weintroub, J.
Takahashi, M.
Wach, T.
Honma, M.
Mizuno, T.
Zech, A.
Eatough, R. P.
Stamerra, A.
Mereu, I.
Paredes, J. M.
Suson, D. J.
Lombardi, S.
Inoue, M.
Einecke, S.
Nigro, C.
Ryan, J. L.
Chang, D. O.
Nishijima, K.
Millard, M. J.
Jannuzi, B. T.
McGrath, C. E.
Ward-Thompson, D.
Kramer, M.
Roelofs, F.
Gradetzke, T.
Liu, X.
Santangelo, A.
Kettenis, M.
Brose, R.
Fukami, S.
Doro, M.
Hirota, T.
Matthews, L. D.
Ohm, S.
Fröse, S.
Chen, Y.
Liuzzo, E.
Marchili, N.
Ricarte, A.
Duerr, A.
Ravikularaman, S.
Sánchez-Conde, M.
Huang, Zhiqiu
Shao, L.
Font, L.
Lo, W.-P.
Chatterjee, S.
Grenier, I. A.
Antonelli, L. A.
Giordano, F.
Leitl, F.
Rani, B.
Di Pierro, F.
Colombo, E.
Neilsen, J.
Kosack, K.
Holch, T. L.
Navarro Fuentes, S.
Nanci, C.
Haggard, D.
Berge, D.
Wagner, S. J.
Kravchenko, E. V.
Tavecchio, F.
Ramakrishnan, V.
Li, G.
Tsirou, M.
Schloerb, F. P.
Rottmann, H.
Caraveo, P. A.
Boisson, C.
Miener, T.
Toma, K.
Holder, J.
Sgrò, C.
Bradascio, F.
Grau, R.
Bach, U.
Aguasca-Cabot, A.
Kasai, E.
Barrio, J. A.
Contreras, J. L.
Jiménez-Rosales, A.
Fraga-Encinas, R.
Savolainen, T.
Gargano, F.
Bonino, R.
Panny, S.
Arbet Engels, A.
Narayanan, G.
Cotter, G.
Kramer, J. A.
Mizuno, Y.
O’Brien, S.
Nilsson, K.
Mackey, J.
Bautista, A.
Berti, A.
de Bony de Lavergne, M.
Tanaka, T.
Brown, A.
Germani, S.
Cui, Y.-Z.
Benson, B. A.
Falcone, A. D.
Babić, A.
Cerasole, D.
Fariña, L.
Zhao, R.
Lang, R. G.
Özel, F.
Kim, J.
Vassiliev, V. V.
Lamastra, A.
Ball, D.
Chen, M.-T.
Johnson, M. N.
Humensky, T. B.
Ernenwein, J.-P.
Kushida, J.
Nakamura, M.
Prada Moroni, P. G.
Santander, M.
Dazzi, F.
Paoletti, R.
La Bella, N.
Sohn, B. W.
Fuentes, A.
Celic, J.
Terauchi, K.
Myserlis, I.
Stanway, J. S.
Bronzwaer, T.
Cho, I.
Torres, D. F.
Ro, H.
Barrett, J.
Elsaesser, D.
Blanch, O.
Wielgus, M.
Sitarek, J.
Djuvsland, J.
Sánchez-Portal, M.
Khatoon, R.
Funk, S.
Loparco, F.
Reville, B.
Majumdar, P.
Otero-Santos, J.
Chatterjee, K.
Natarajan, I.
Hinrichs, C. E.
Zhao, G.-Y.
Torne, P.
Gaug, M.
Omodei, N.
Castro-Tirado, A. J.
Baloković, M.
Cerruti, M.
Mondal, H. A.
Bruel, P.
Pensec, U.
Ohtani, Y.
lackburn, L.
Tiede, P.
Park, J.
Kramer, C.
Hesper, R.
Mus, A.
Davelaar, J.
Machado de Oliveira Fraga, B.
Pirola, G.
Liu, J.
Ford, N. M.
Ford, H. A.
Small, D.
Dihingia, I. K.
De Lotto, B.
Kumar, S.
Nagai, H.
Kerszberg, D.
Nievas Rosillo, M.
Tazaki, F.
Martí-Vidal, I.
Persic, M.
Saz Parkinson, P. M.
Gasbarra, C.
Splettstoesser, M.
Kobayashi, Y.
Tetarenko, A. J.
Leuschner, F.
Aschersleben, J.
Tutone, A.
Malyshev, D.
Schäfer, J.
De Laurentis, M.
Nikolić, L.
Yamaguchi, P.
Righi, C.
Suzuki, H.
Goswami, P.
Furniss, A.
Keating, G. K.
Prather, B.
Di Tria, R.
Wong, G. N.
Porth, O.
de Ona Wilhelmi, E.
Maneva, G.
Chen, Z.
Baczko, A.-K.
Mariotti, M.
Strzys, M.
Barbosa Martins, V.
Oh, J.
Zensus, J. A.
Krichbaum, T. P.
Wierzcholska, A.
Li, B.
Principe, G.
D’Elia, V.
Batzofin, R.
Sharma, A.
Gold, R.
Yadlapalli, N.
Longo, F.
Manganaro, M.
Bauböck, M.
Kleiner, T. K.
Lovellette, M. N.
Giesbrecht Paiva, J. G.
Kocherlakota, P.
Schmuckermaier, F.
Becherini, Y.
Boyce, H.
Mazziotta, M. N.
Fomalont, E.
Fukazawa, Y.
Martínez, M.
Lobanov, A. P.
Krennrich, F.
Suutarinen, S.
Conway, J. E.
Verna, G.
Bouman, K. L.
Lindqvist, M.
Farah, J.
Le Stum, S.
Xia, B.
Zhang, H.
Carretero-Castrillo, M.
Reis, I.
Herrera Llorente, J.
Menchiari, S.
Sun, H.
Takahashi, T.
Moscibrodzka, M.
Kuss, M.
Anantua, R.
Marx, R.
Psaltis, D.
Borowska, J.
Yan, H.
Morselli, A.
Ashkar, H.
Podobnik, F.
Valverde, J.
Trippe, S.
Lonsdale, C. J.
Zhao, S.-S.
Cavazzuti, E.
Mitchell, A.
Panter, M.
Salzmann, H.
Foschi, M.
Jeter, B.
Stawarz, Łukasz
Busetto, G.
Toscano, T.
Sheridan, C.
Gómez-Ruiz, A. I.
Hassan, T.
D’Amico, G.
Jorstad, S.
Li, Z.
Yuan, Y.-F.
Olivares, H.
PopStefanija, A.
Schonfeld, J.
Katarzyński, K.
van Eldik, C.
Yfantis, A.
López-Moya, M.
Mazin, D.
Carosi, R.
Cheong, W.-Y.
Wang, N.
Takeishi, R.
Domínguez, A.
Dominis Prester, D.
Artero, M.
García, R.
Sahakian, V.
Müller, C.
Streil, K.
López-Coto, R.
Hanlon, W.
Roshanineshat, A.
Aniello, T.
Vazquez Acosta, M.
Dexter, J.
Matsushita, S.
Njoh Ekoume, T.
Dinesh, A.
Jung-Richardt, I.
Tilanus, R. P. J.
Burelli, I.
Emami, R.
Shapopi, J. N. S.
Yu, W.
Dorner, D.
Jiménez Martínez, I.
Sciaccaluga, A.
Schüssler, F.
Vovk, I.
Sakai, N.
Arcaro, C.
Grolleron, G.
Lang, M. J.
Dempsey, J.
Heckmann, L.
Kertzman, M.
Washington, J. E.
Martí-Devesa, G.
Sánchez, S.
Ikeda, S.
Marrone, D. P.
Yuan, F.
Lisakov, M.
MacDonald, N. R.
Sol, H.
Di Lalla, N.
Molero González, M.
Blandford, R. D.
Mizuno, I.
Garczarczyk, M.
Musoke, G.
Holler, M.
Pesce, D. W.
Orlando, E.
Hays, E.
Cecil, R.
Algaba, J. C.
Pen, U.-L.
Lowitz, A. E.
Cristarella Orestano, P.
Hrupec, D.
Fromm, C. M.
Azulay, R.
Conroy, N. S.
Koch, P. M.
Alberdi, A.
Roy, A. L.
Pihet, M.
Moralejo, A.
Young, A.
Da Vela, P.
Batković, I.
Gu, M.
Markoff, S.
Fontaine, G.
Titus, M.
Kuo, C.-Y.
Michail, J.
Chen, A.
Wiik, K.
Neustroev, V.
Lico, R.
Montanari, A.
Sembroski, G. H.
Besenrieder, J.
Desvignes, G.
Lenain, J.-P.
Moulin, E.
Kofuji, Y.
Carosi, A.
Moriarty, P.
Miranda, J. M.
van Langevelde, H. J.
Abe, S.
van Rossum, D. R.
Böttcher, M.
Ruszczyk, C.
Covino, S.
Bower, G. C.
Ripperda, B.
Ong, R. A.
Priyadarshi, C.
Tucci, J. V.
Temnikov, P.
Meyer, M.
Blundell, R.
Koay, J. Y.
Di Venere, L.
Damascene Mbarubucyeye, J.
Moderski, R.
O’Brien, P.
Mannheim, K.
Jones, A. C.
Doeleman, S. S.
Cortina, J.
Turk, M.
Makariev, M.
Huang, C.-W. L.
Prandini, E.
Pohl, M.
Wu, Q.
Heumann, D.
Reynolds, P. T.
Freeman, W. T.
Raymond, A. W.
Franckowiak, A.
Truzzi, S.
Monzani, M. E.
Loinard, L.
Friberg, P.
Giliberti, M.
Mao, J.
Jormanainen, J.
James, D. J.
Molina, E.
Abhir, J.
Gentaz, O.
Okino, H.
Rao, R.
Ribeiro, D.
Crawford, T. M.
Gómez, J. L.
Chael, A.
Deane, R.
Lyard, E.
van Scherpenberg, J.
Sadeh, I.
Ciprini, S.
Maier, G.
Imazawa, R.
Mas-Aguilar, A.
Pita, S.
Liu, Z.
Ubach, S.
Donini, A.
Savchenko, S. S.
Dhruv, V.
Schmidt, K.
Cifuentes, A.
Kundu, A.
Palumbo, D. C. M.
Green, J. G.
Zacharias, M.
Lundy, M.
Sasada, M.
Niemiec, J.
Kawashima, T.
Bonnoli, G.
Acciari, V. A.
Filippos Paraschos, G.
Günther, P.
Will, M.
Glawion, D.
Cutini, S.
Peresano, M.
Feng, Q.
Chai, Y.
Traianou, E.
Hada, K.
Luashvili, A.
Ishio, K.
Sahakyan, N.
Quinn, J.
Paneque, D.
Kerby, S.
Kieda, D.
Saha, L.
Adams, C. B.
Glicenstein, J. F.
Gammie, C. F.
Acharyya, A.
Broguiere, D.
Wajima, K.
Lu, R.-S.
Sasaki, M.
Delfino, M.
Carlstrom, J. E.
Reimer, O.
Steppa, C.
Sosapanta Salas, L. D.
Lemière, A.
Bruno, B.
Bigongiari, C.
Marscher, A. P.
Giroletti, M.
Fortson, L.
Ros, E.
Cameron, R. A.
Ostrowski, Michał
Taylor, A. M.
Vecchi, M.
Lindahl, G.
Jung, T.
Koyama, S.
Casanova, S.
Baxter, J.
Schweizer, T.
Nowak, M. A.
Martínez-Chicharro, M.
Quirrenbach, A.
Foffano, L.
Witzel, G.
Britzen, S.
Fegan, S. J.
Ruiz, I.
Backes, M.
Bošnjak, Ž.
De Angelis, A.
Yamamoto, T.
Schutte, H. M.
Liu, K.
Miceli, D.
Menten, K. M.
Christian, P.
Zhong, W.
Campoy-Ordaz, A.
Terzić, T.
Ragan, K.
Joshi, A. V.
Giglietto, N.
D’Ammando, F.
Fattorini, A.
Walter, R.
Haerer, L.
Teshima, M.
Bandyopadhyay, B.
Bednarek, W.
Agudo, I.
Gurwell, M. A.
Ma, J.
Falcke, H.
de Menezes, R.
Shang, R.
Moghadam, M. O.
Bintley, D.
Zaharijas, G.
Medeiros, L.
Bulik, T.
Kino, M.
Komin, Nu.
Loporchio, S.
Nathanail, A.
Ruiz-Velasco, E.
Mirabal, N.
Lee, S.-S.
Trent, T.
Bangale, P.
Bernardini, E.
Bissaldi, E.
Noda, K.
Hughes, D. H.
Parsons, H.
Reimer, A.
Becerra González, J.
Gabici, S.
Kaur, A.
Żywucka, N.
Piétu, V.
Tajima, H.
Bronzini, E.
Ansoldi, S.
Kayanoki, T.
Lemoine-Goumard, M.
Sánchez-Argüelles, D.
Asano, K.
Siskind, E. J.
Vigorito, C. F.
Strom, D.
Mooney, C. L.
Viale, I.
Müller, H.
Nakamori, T.
Rico, J.
Karuppusamy, R.
Asada, K.
Chand, T.
Rygl, K. L. J.
Fusco, P.
Mukherjee, R.
Lorini, A.
Gliwny, P.
Spinelli, P.
Wagner, J.
Khélifi, B.
Oyama, T.
Ni, C.
Bellazzini, R.
Bouyahiaoui, M.
Jamrozy, Marek
Yonekura, Y.
Crew, G. B.
Devin, J.
Pueschel, E.
Younsi, Z.
Sawada-Satoh, S.
Jin, W.
Ventura, S.
Bartkoske, J. T.
Mender, S.
Williams, D. A.
Shen, Z.
Levis, A.
Goddi, C.
Kluge, G. W.
Heß, B.
Nagar, N. M.
Strišković, J.
Ning, W.
Michelson, P. F.
Chibueze, O.
Chandra, S.
SooHoo, J.
Alef, W.
Wardle, J.
Wunderlich, C.
Fish, V. L.
Spencer, S.
Rainò, S.
Talluri, A. K.
Huang, L.
Sobczynska, D.
Ren, H.
Rezzolla, L.
Liu, Q.
Nozaki, S.
Paiano, S.
Horns, D.
Nair, D. G.
Mangano, S.
Ribó, M.
Benbow, W.
Roellinghoff, G.
Pu, H.-Y.
Morcuende, D.
Spolon, A.
Láinez, M.
Mirzoyan, R.
Christiansen, J. L.
Rudak, B.
Liodakis, I.
Akiyama, K.
Rawlings, M. G.
Gasparyan, S.
Escudero, J.
Dzib, S. A.
Bremer, M.
Mulaudzi, W.
Larsson, S.
Sliusar, V.
Ho, L. C.
Delgado, J.
Dmytriiev, A.
Broderick, A. E.
Cheung, C. C.
Aharonian, F.
Cheng, X.
Chibueze, J.
Schuster, K.-F.
Burger-Scheidlin, C.
Yoon, D.
Sabri, K.
Terrier, R.
Feijen, K.
Bolmont, J.
Galison, P.
Souccar, K.
Ait Benkhali, F.
Kim, J.-Y.
Ho, P.
Montgomery, J.
Cui, L.
Korzoun, N.
Bernete, J.
García López, R. J.
Dahale, R.
Saito, T.
Romero-Cañizales, C.
Cruz-Osorio, A.
Pühlhofer, G.
Vitale, V.
Wong, S. L.
van Bemmel, I.
López-Oramas, A.
Zdziarski, A. A.
Wharton, R.
Tluczykont, M.
Wondrak, M. F.
Jankowsky, F.
Horan, D.
Zhang, S.
Delgado Mendez, C.
Hervet, O.
Janssen, M.
Bustamante, S.
Schubert, J. L.
Suda, Y.
Rieger, F.
Kouch, P. M.
Wang, J.
Mohrmann, L.
Jiang, W.
Opis:
Context. The nearby elliptical galaxy M87 contains one of only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (EHT). In 2018, more than two dozen multi-wavelength (MWL) facilities (from radio to γ-ray energies) took part in the second M87 EHT campaign. Aims. The goal of this extensive MWL campaign was to better understand the physics of the accreting black hole M87*, the relationship between the inflow and inner jets, and the high-energy particle acceleration. Understanding the complex astrophysics is also a necessary first step towards performing further tests of general relativity. Methods. The MWL campaign took place in April 2018, overlapping with the EHT M87* observations. We present a new, contemporaneous spectral energy distribution (SED) ranging from radio to very high-energy (VHE) γ-rays as well as details of the individual observations and light curves. We also conducted phenomenological modelling to investigate the basic source properties. Results. We present the first VHE γ-ray flare from M87 detected since 2010. The flux above 350 GeV more than doubled within a period of ≈36 hours. We find that the X-ray flux is enhanced by about a factor of two compared to 2017, while the radio and millimetre core fluxes are consistent between 2017 and 2018. We detect evidence for a monotonically increasing jet position angle that corresponds to variations in the bright spot of the EHT image. Conclusions. Our results show the value of continued MWL monitoring together with precision imaging for addressing the origins of high-energy particle acceleration. While we cannot currently pinpoint the precise location where such acceleration takes place, the new VHE γ-ray flare already presents a challenge to simple one-zone leptonic emission model approaches, and it emphasises the need for combined image and spectral modelling.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 66

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