Observation and Characterization of a Cosmic Muon Neutrino Flux from the Northern Hemisphere using six years of IceCube data

Astrophysical Journal IOP Publishing 833:1 (2016) 3

Authors:

MG Aartsen, K Abraham, M Ackermann, Subir Sarkar

Abstract:

The IceCube Collaboration has previously discovered a high-energy astrophysical neutrino flux using neutrino events with interaction vertices contained within the instrumented volume of the IceCube detector. We present a complementary measurement using charged current muon neutrino events where the interaction vertex can be outside this volume. As a consequence of the large muon range the effective area is significantly larger but the field of view is restricted to the Northern Hemisphere. IceCube data from 2009 through 2015 have been analyzed using a likelihood approach based on the reconstructed muon energy and zenith angle. At the highest neutrino energies between 194 TeV and 7.8 PeV a significant astrophysical contribution is observed, excluding a purely atmospheric origin of these events at 5.6s significance. The data are well described by an isotropic, unbroken power-law flux with a normalization at 100 TeV neutrino energy of (0.90 -0.27+0.30) × 10-18 Gev-1 cm-2 s-1 sr-1and a hard spectral index of γ = 2.13 ± 0.13. The observed spectrum is harder in comparison to previous IceCube analyses with lower energy thresholds which may indicate a break in the astrophysical neutrino spectrum of unknown origin. The highest-energy event observed has a reconstructed muon energy of (4.5 ± 1.2) PeV which implies a probability of less than 0.005% for this event to be of atmospheric origin. Analyzing the arrival directions of all events with reconstructed muon energies above 200 TeV no correlation with known γ-ray sources was found. Using the high statistics of atmospheric neutrinos we report the current best constraints on a prompt atmospheric muon neutrino flux originating from charmed meson decays which is below 1.06 in units of the flux normalization of the model in Enberg et al.

Transverse oscillations in a coronal loop triggered by a jet

(2016)

Authors:

S Sarkar, V Pant, AK Srivastava, D Banerjee

Very high-energy gamma-ray follow-up program using neutrino triggers from IceCube

Journal of Instrumentation Institute of Physics 11:11 (2016) P11009

Authors:

MG Aartsen, K Abraham, M Ackermann, Subir Sarkar

Abstract:

We describe and report the status of a neutrino-triggered program in IceCube that generates real-time alerts for gamma-ray follow-up observations by atmospheric-Cherenkov telescopes (MAGIC and VERITAS). While IceCube is capable of monitoring the whole sky continuously, high-energy gamma-ray telescopes have restricted fields of view and in general are unlikely to be observing a potential neutrino-flaring source at the time such neutrinos are recorded. The use of neutrino-triggered alerts thus aims at increasing the availability of simultaneous multi-messenger data during potential neutrino flaring activity, which can increase the discovery potential and constrain the phenomenological interpretation of the high-energy emission of selected source classes (e.g. blazars). The requirements of a fast and stable online analysis of potential neutrino signals and its operation are presented, along with first results of the program operating between 14 March 2012 and 31 December 2015.

Marginal evidence for cosmic acceleration from Type Ia supernovae

Scientific Reports Springer Nature 6:1 (2016) 35596

Authors:

JT Nielsen, A Guffanti, Subir Sarkar

Abstract:

The ‘standard’ model of cosmology is founded on the basis that the expansion rate of the universe is accelerating at present — as was inferred originally from the Hubble diagram of Type Ia supernovae. There exists now a much bigger database of supernovae so we can perform rigorous statistical tests to check whether these ‘standardisable candles’ indeed indicate cosmic acceleration. Taking account of the empirical procedure by which corrections are made to their absolute magnitudes to allow for the varying shape of the light curve and extinction by dust, we find, rather surprisingly, that the data are still quite consistent with a constant rate of expansion.

Contributions of the Cherenkov Telescope Array (CTA) to the 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma 2016)

(2016)

Authors:

The CTA Consortium, :, A Abchiche, U Abeysekara, Ó Abril, F Acero, BS Acharya, C Adams, G Agnetta, F Aharonian, A Akhperjanian, A Albert, M Alcubierre, J Alfaro, R Alfaro, AJ Allafort, R Aloisio, J-P Amans, E Amato, L Ambrogi, G Ambrosi, M Ambrosio, J Anderson, M Anduze, EO Angüner, E Antolini, LA Antonelli, M Antonucci, V Antonuccio, P Antoranz, C Aramo, A Aravantinos, M Araya, C Arcaro, B Arezki, A Argan, T Armstrong, F Arqueros, L Arrabito, M Arrieta, K Asano, M Ashley, P Aubert, CB Singh, A Babic, M Backes, A Bais, S Bajtlik, C Balazs, M Balbo, D Balis, C Balkowski, O Ballester, J Ballet, A Balzer, A Bamba, R Bandiera, A Barber, C Barbier, M Barcelo, M Barkov, A Barnacka, U Barres de Almeida, JA Barrio, S Basso, D Bastieri, C Bauer, U Becciani, Y Becherini, J Becker Tjus, V Beckmann, W Bednarek, W Benbow, D Benedico Ventura, J Berdugo, D Berge, E Bernardini, MG Bernardini, S Bernhard, K Bernlöhr, B Bertucci, M-A Besel, V Beshley, N Bhatt, P Bhattacharjee, W Bhattacharyya, S Bhattachryya, B Biasuzzi, G Bicknell, C Bigongiari, A Biland, A Bilinsky, W Bilnik, B Biondo, R Bird, T Bird, E Bissaldi, M Bitossi, O Blanch, P Blasi, J Blazek, C Bockermann, C Boehm, L Bogacz, M Bogdan, M Bohacova, C Boisson, J Boix, J Bolmont, G Bonanno, A Bonardi, C Bonavolontà, P Bonifacio, F Bonnarel, G Bonnoli, J Borkowski, R Bose, Z Bosnjak, M Böttcher, J-J Bousquet, C Boutonnet, F Bouyjou, L Bowman, C Braiding, T Brantseg, S Brau-Nogué, J Bregeon, M Briggs, M Brigida, T Bringmann, W Brisken, D Bristow, R Britto, E Brocato, S Bron, P Brook, W Brooks, AM Brown, K Brügge, F Brun, P Brun, P Brun, G Brunetti, L Brunetti, P Bruno, T Buanes, N Bucciantini, G Buchholtz, J Buckley, V Bugaev, R Bühler, A Bulgarelli, T Bulik, M Burton, A Burtovoi, G Busetto, S Buson, J Buss, K Byrum, F Cadoux, J Calvo Tovar, R Cameron, F Canelli, R Canestrari, M Capalbi, M Capasso, G Capobianco, A Caproni, P Caraveo, J Cardenzana, M Cardillo, S Carius, C Carlile, A Carosi, R Carosi, E Carquín, J Carr, M Carroll, J Carter, P-H Carton, J-M Casandjian, S Casanova, S Casanova, E Cascone, M Casiraghi, A Castellina, J Castroviejo Mora, F Catalani, O Catalano, S Catalanotti, D Cauz, S Cavazzani, P Cerchiara, E Chabanne, P Chadwick, T Chaleil, C Champion, A Chatterjee, S Chaty, R Chaves, A Chen, X Chen, X Chen, K Cheng, M Chernyakova, L Chiappetti, M Chikawa, D Chinn, VR Chitnis, N Cho, A Christov, J Chudoba, M Cieślar, MA Ciocci, R Clay, S Colafrancesco, P Colin, J-M Colley, E Colombo, J Colome, S Colonges, V Conforti, V Connaughton, S Connell, J Conrad, JL Contreras, P Coppi, S Corbel, J Coridian, R Cornat, P Corona, D Corti, J Cortina, L Cossio, A Costa, H Costantini, G Cotter, B Courty, S Covino, G Covone, G Crimi, SJ Criswell, R Crocker, J Croston, J Cuadra, P Cumani, G Cusumano, P Da Vela, Ø Dale, F D'Ammando, D Dang, VT Dang, L Dangeon, M Daniel, I Davids, I Davids, B Dawson, F Dazzi, B de Aguiar Costa, A De Angelis, RF de Araujo Cardoso, V De Caprio, R de Cássia dos Anjos, G De Cesare, A De Franco, F De Frondat, EM de Gouveia Dal Pino, I de la Calle, C De Lisio, R de los Reyes Lopez, B De Lotto, A De Luca, JRT de Mello Neto, M de Naurois, E de Oña Wilhelmi, F De Palma, F De Persio, V de Souza, G Decock, J Decock, C Deil, M Del Santo, E Delagnes, G Deleglise, C Delgado, J Delgado, D della Volpe, P Deloye, M Detournay, A Dettlaff, J Devin, T Di Girolamo, C Di Giulio, A Di Paola, F Di Pierro, MA Diaz, C Díaz, C Dib, J Dick, H Dickinson, S Diebold, S Digel, J Dipold, G Disset, A Distefano, A Djannati-Ataï, M Doert, M Dohmke, A Domínguez, N Dominik, J-L Dominique, D Dominis Prester, A Donat, I Donnarumma, D Dorner, M Doro, J-L Dournaux, T Downes, K Doyle, G Drake, S Drappeau, H Drass, D Dravins, L Drury, G Dubus, L Ducci, D Dumas, K Dundas Morå, D Durand, D D'Urso, V Dwarkadas, J Dyks, M Dyrda, J Ebr, E Edy, K Egberts, P Eger, A Egorov, S Einecke, J Eisch, F Eisenkolb, C Eleftheriadis, D Elsaesser, D Elsässer, D Emmanoulopoulos, C Engelbrecht, D Engelhaupt, J-P Ernenwein, P Escarate, S Eschbach, C Espinoza, P Evans, M Fairbairn, D Falceta-Goncalves, A Falcone, V Fallah Ramazani, D Fantinel, K Farakos, C Farnier, E Farrell, G Fasola, Y Favre, E Fede, R Fedora, E Fedorova, S Fegan, D Ferenc, M Fernandez-Alonso, A Fernández-Barral, G Ferrand, O Ferreira, M Fesquet, P Fetfatzis, E Fiandrini, A Fiasson, A Filipčič, M Filipovic, D Fink, C Finley, JP Finley, A Finoguenov, V Fioretti, M Fiorini, H Fleischhack, H Flores, D Florin, C Föhr, E Fokitis, MV Fonseca, L Font, G Fontaine, B Fontes, M Fornasa, M Fornasa, A Förster, P Fortin, L Fortson, N Fouque, A Franckowiak, A Franckowiak, FJ Franco, I Freire Mota Albuquerque, L Freixas Coromina, L Fresnillo, C Fruck, M Fuessling, D Fugazza, Y Fujita, S Fukami, Y Fukazawa, T Fukuda, Y Fukui, S Funk, A Furniss, W Gäbele, S Gabici, A Gadola, D Galindo, DD Gall, Y Gallant, D Galloway, S Gallozzi, JA Galvez, S Gao, A Garcia, B Garcia, R García Gil, R Garcia López, M Garczarczyk, D Gardiol, C Gargano, F Gargano, S Garozzo, F Garrecht, L Garrido, M Garrido-Ruiz, D Gascon, J Gaskins, J Gaudemard, M Gaug, J Gaweda, B Gebhardt, M Gebyehu, N Geffroy, B Genolini, L Gerard, A Ghalumyan, A Ghedina, P Ghislain, P Giammaria, E Giannakaki, F Gianotti, S Giarrusso, G Giavitto, B Giebels, T Gieras, N Giglietto, V Gika, R Gimenes, M Giomi, P Giommi, F Giordano, G Giovannini, P Girardot, E Giro, M Giroletti, J Gironnet, A Giuliani, J-F Glicenstein, R Gnatyk, N Godinovic, P Goldoni, G Gomez, MM Gonzalez, A González, D Gora, KS Gothe, D Gotz, J Goullon, T Grabarczyk, R Graciani, J Graham, P Grandi, J Granot, G Grasseau, R Gredig, AJ Green, AM Green, T Greenshaw, I Grenier, S Griffiths, A Grillo, M-H Grondin, J Grube, M Grudzinska, J Grygorczuk, V Guarino, D Guberman, S Gunji, G Gyuk, D Hadasch, A Hagedorn, L Hagge, J Hahn, H Hakobyan, S Hara, MJ Hardcastle, T Hassan, K Hatanaka, T Haubold, A Haupt, T Hayakawa, M Hayashida, M Heller, R Heller, JC Helo, F Henault, G Henri, G Hermann, R Hermel, J Herrera Llorente, J Herrera Llorente, A Herrero, O Hervet, N Hidaka, J Hinton, W Hirai, K Hirotani, B Hnatyk, J Hoang, D Hoffmann, W Hofmann, T Holch, J Holder, S Hooper, D Horan, J Hörandel, M Hörbe, D Horns, P Horvath, J Hose, J Houles, T Hovatta, M Hrabovsky, D Hrupec, J-M Huet, M Huetten, G Hughes, D Hui, TB Humensky, M Hussein, M Iacovacci, A Ibarra, Y Ikeno, JM Illa, D Impiombato, T Inada, S Incorvaia, L Infante, Y Inome, S Inoue, T Inoue, Y Inoue, F Iocco, K Ioka, M Iori, K Ishio, K Ishio, GL Israel, Y Iwamura, C Jablonski, A Jacholkowska, J Jacquemier, M Jamrozy, P Janecek, M Janiak, D Jankowsky, F Jankowsky, P Jean, I Jegouzo, P Jenke, JJ Jimenez, M Jingo, M Jingo, L Jocou, T Jogler, CA Johnson, M Jones, M Josselin, L Journet, I Jung, P Kaaret, M Kagaya, J Kakuwa, O Kalekin, C Kalkuhl, H Kamon, R Kankanyan, A Karastergiou, K Kärcher, M Karczewski, S Karkar, P Karn, J Kasperek, H Katagiri, J Kataoka, K Katarzyński, S Kato, U Katz, N Kawanaka, L Kaye, D Kazanas, N Kelley-Hoskins, J Kersten, B Khélifi, DB Kieda, T Kihm, S Kimeswenger, S Kisaka, S Kishida, R Kissmann, S Klepser, W Kluźniak, J Knapen, J Knapp, J Knödlseder, B Koch, F Köck, J Kocot, K Kohri, K Kokkotas, K Kokkotas, D Kolitzus, N Komin, I Kominis, A Kong, Y Konno, K Kosack, G Koss, M Kossatz, G Kowal, S Koyama, J Kozioł, M Kraus, J Krause, M Krause, H Krawzcynski, F Krennrich, A Kretzschmann, P Kruger, H Kubo, V Kudryavtsev, G Kukec Mezek, M Kuklis, H Kuroda, J Kushida, A La Barbera, N La Palombara, V La Parola, G La Rosa, H Laffon, R Lahmann, M Lakicevic, K Lalik, G Lamanna, D Landriu, H Landt, RG Lang, J Lapington, P Laporte, J-P Le Fèvre, T Le Flour, P Le Sidaner, S-H Lee, WH Lee, J-P Lees, J Lefaucheur, K Leffhalm, H Leich, MA Leigui de Oliveira, D Lelas, A Lemière, M Lemoine-Goumard, J-P Lenain, R Leonard, R Leoni, L Lessio, G Leto, A Leveque, B Lieunard, M Limon, R Lindemann, E Lindfors, L Linhoff, A Liolios, A Lipniacka, H Lockart, T Lohse, E Łokas, S Lombardi, F Longo, A Lopatin, M Lopez, D Loreggia, T Louge, F Louis, M Louys, F Lucarelli, D Lucchesi, H Lüdecke, T Luigi, PL Luque-Escamilla, E Lyard, MC Maccarone, T Maccarone, TJ Maccarone, E Mach, GM Madejski, A Madonna, F Magniette, A Magniez, M Mahabir, G Maier, P Majumdar, P Majumdar, M Makariev, G Malaguti, G Malaspina, AK Mallot, A Malouf, S Maltezos, D Malyshev, A Mancilla, D Mandat, G Maneva, M Manganaro, S Mangano, P Manigot, N Mankushiyil, K Mannheim, N Maragos, D Marano, P Marchegiani, JA Marcomini, A Marcowith, M Mariotti, M Marisaldi, S Markoff, C Martens, J Martí, J-M Martin, L Martin, P Martin, G Martínez, M Martínez, O Martínez, K Martynyuk-Lototskyy, R Marx, N Masetti, P Massimino, A Mastichiadis, S Mastroianni, M Mastropietro, S Masuda, H Matsumoto, S Matsuoka, N Matthews, S Mattiazzo, G Maurin, N Maxted, N Maxted, J Maya, M Mayer, D Mazin, MN Mazziotta, L Mc Comb, N McCubbin, I McHardy, C Medina, F Mehrez, C Melioli, D Melkumyan, T Melse, S Mereghetti, M Merk, P Mertsch, J-L Meunier, T Meures, M Meyer, JL Meyrelles, A Miccichè, T Michael, J Michałowski, P Mientjes, I Mievre, A Mihailidis, J Miller, T Mineo, M Minuti, N Mirabal, F Mirabel, JM Miranda, R Mirzoyan, A Mitchell, T Mizuno, R Moderski, I Mognet, M Mohammed, R Moharana, L Mohrmann, E Molinari, P Molyneux, E Monmarthe, G Monnier, T Montaruli, C Monte, I Monteiro, D Mooney, P Moore, A Moralejo, C Morello, E Moretti, K Mori, P Morris, A Morselli, F Moscato, D Motohashi, F Mottez, Y Moudden, E Moulin, S Mueller, R Mukherjee, P Munar, M Munari, C Mundell, J Mundet, H Muraishi, K Murase, A Muronga, A Murphy, N Nagar, S Nagataki, T Nagayoshi, BK Nagesh, T Naito, D Nakajima, D Nakajima, T Nakamori, K Nakayama, J Nanni, D Naumann, P Nayman, L Nellen, R Nemmen, A Neronov, N Neyroud, T Nguyen, TT Nguyen, T Nguyen Trung, L Nicastro, J Nicolau-Kukliński, F Niederwanger, A Niedźwiecki, J Niemiec, D Nieto, M Nievas-Rosillo, A Nikolaidis, M Nikołajuk, K Nishijima, K-I Nishikawa, G Nishiyama, K Noda, K Noda, L Nogues, S Nolan, R Northrop, D Nosek, M Nöthe, B Novosyadlyj, L Nozka, F Nunio, L Oakes, P O'Brien, C Ocampo, G Occhipinti, JP Ochoa, A OFaolain de Bhroithe, R Oger, Y Ohira, M Ohishi, S Ohm, H Ohoka, N Okazaki, A Okumura, J-F Olive, D Olszowski, RA Ong, S Ono, M Orienti, R Orito, A Orlati, J Osborne, M Ostrowski, D Ottaway, N Otte, S Öttl, E Ovcharov, I Oya, A Ozieblo, M Padovani, I Pagano, S Paiano, A Paizis, J Palacio, M Palatka, J Pallotta, K Panagiotidis, J-L Panazol, D Paneque, M Panter, MR Panzera, R Paoletti, M Paolillo, A Papayannis, G Papyan, A Paravac, JM Paredes, G Pareschi, N Park, D Parsons, P Paśko, S Pavy, M Pech, A Peck, G Pedaletti, A Pe'er, S Peet, D Pelat, A Pepato, MDC Perez, L Perri, M Perri, M Persic, M Persic, A Petrashyk, P-O Petrucci, O Petruk, B Peyaud, M Pfeifer, G Pfeiffer, G Piano, D Pieloth, E Pierre, F Pinto de Pinho, C Pio García, Y Piret, A Pisarski, S Pita, Ł Platos, R Platzer, S Podkladkin, L Pogosyan, M Pohl, P Poinsignon, A Pollo, A Porcelli, J Porthault, W Potter, S Poulios, J 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Safi-Harb, A Saggion, V Sahakian, T Saito, N Sakaki, S Sakurai, A Salamon, M Salega, D Salek, F Salesa Greus, J Salgado, G Salina, L Salinas, A Salini, D Sanchez, M Sanchez-Conde, H Sandaker, A Sandoval, P Sangiorgi, M Sanguillon, H Sano, M Santander, A Santangelo, EM Santos, R Santos-Lima, A Sanuy, L Sapozhnikov, S Sarkar, K Satalecka, K Satalecka, Y Sato, R Savalle, M Sawada, F Sayède, S Schanne, T Schanz, EJ Schioppa, S Schlenstedt, J Schmid, T Schmidt, J Schmoll, M Schneider, H Schoorlemmer, P Schovanek, A Schubert, E-M Schullian, J Schultze, A Schulz, S Schulz, K Schure, F Schussler, T Schwab, U Schwanke, J Schwarz, T Schweizer, S Schwemmer, U Schwendicke, C Schwerdt, E Sciacca, S Scuderi, A Segreto, J-H Seiradakis, GH Sembroski, D Semikoz, O Sergijenko, N Serre, M Servillat, K Seweryn, N Shafi, A Shalchi, M Sharma, M Shayduk, RC Shellard, T Shibata, A Shigenaka, I Shilon, E Shum, L Sidoli, M Sidz, J Sieiro, H Siejkowski, J Silk, A Sillanpää, D Simone, H Simpson, BB Singh, A 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Tezier, J Thayer, J Thornhill, S Thoudam, D Thuermann, L Tibaldo, A Tiengo, MC Timpanaro, D Tiziani, M Tluczykont, CJ Todero Peixoto, F Tokanai, M Tokarz, K Toma, J Tomastik, Y Tomono, A Tonachini, D Tonev, K Torii, M Tornikoski, DF Torres, M Torres, E Torresi, G Toso, G Tosti, T Totani, N Tothill, F Toussenel, G Tovmassian, T Toyama, P Travnicek, C Trichard, M Trifoglio, I Troyano Pujadas, M Trzeciak, K Tsinganos, S Tsujimoto, T Tsuru, Y Uchiyama, G Umana, Y Umetsu, SS Upadhya, M Uslenghi, V Vagelli, F Vagnetti, J Valdes-Galicia, M Valentino, P Vallania, L Valore, W van Driel, C van Eldik, B van Soelen, J Vandenbroucke, J Vanderwalt, G Vasileiadis, V Vassiliev, JR Vázquez, ML Vázquez Acosta, M Vecchi, A Vega, I Vegas, P Veitch, P Venault, L Venema, C Venter, S Vercellone, S Vergani, K Verma, V Verzi, GP Vettolani, C Veyssiere, A Viana, N Viaux, J Vicha, C Vigorito, P Vincent, S Vincent, J Vink, V Vittorini, N Vlahakis, L Vlahos, H Voelk, V Voisin, A Vollhardt, A Volpicelli, H von Brand, S Vorobiov, I Vovk, M Vrastil, LV Vu, T Vuillaume, R Wagner, R Wagner, SJ Wagner, SP Wakely, T Walstra, R Walter, T Walther, JE Ward, M Ward, K Warda, D Warren, S Wassberg, JJ Watson, P Wawer, R Wawrzaszek, N Webb, P Wegner, O Weiner, A Weinstein, R Wells, F Werner, H Wetteskind, M White, R White, M Więcek, A Wierzcholska, S Wiesand, R Wijers, P Wilcox, N Wild, A Wilhelm, M Wilkinson, M Will, M Will, DA Williams, JT Williams, R Willingale, N Wilson, M Winde, K Winiarski, H Winkler, M Winter, R Wischnewski, E Witt, P Wojcik, D Wolf, M Wood, A Wörnlein, E Wu, T Wu, KK Yadav, H Yamamoto, T Yamamoto, N Yamane, R Yamazaki, S Yanagita, L Yang, D Yelos, A Yoshida, M Yoshida, T Yoshida, S Yoshiike, T Yoshikoshi, P Yu, V Zabalza, D Zaborov, M Zacharias, G Zaharijas, A Zajczyk, L Zampieri, F Zandanel, R Zanmar Sanchez, D Zaric, D Zavrtanik, M Zavrtanik, A Zdziarski, A Zech, H Zechlin, A Zhao, V Zhdanov, A Ziegler, J Ziemann, K Ziętara, A Zink, J Ziółkowski, V Zitelli, A Zoli, J Zorn, P Żychowski