A Search for Ultra-high-energy Neutrinos from TXS 0506+056 Using the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Albury, J.M.; Allekotte, I.; Almela, A.; Alvarez-Muñiz, J.; Batista, R.A.; Anastasi, G.A.; Anchordoqui, L.; Andrada, B.; Andringa, S.; Aramo, C.; Ferreira, P.R.A.; Asorey, H.; Assis, P.; Avila, G.; Badescu, A.M.; Bakalova, A.; Balaceanu, A.; Barbato, F.; Luz, R.J.B.; Becker, K.H.; Bellido, J.A.; Berat, C.; Bertaina, M.E.; Bertou, X.; Biermann, P.L.; Bister, T.; Biteau, J.; Blazek, J.; Bleve, C.; Boháčová, M.; Boncioli, D.; Bonifazi, C.; Arbeletche, L.B.; Borodai, N.; Botti, A.M.; Brack, J.; Bretz, T.; Briechle, F.L.; Buchholz, P.; Bueno, A.; Buitink, S.; Buscemi, M.; Caballero-Mora, K.S.; Caccianiga, L.; Calcagni, L.; Cancio, A.; Canfora, F.; Caracas, I.; Carceller, J.M.; Caruso, R.; Castellina, A.; Catalani, F.; Cataldi, G.; Cazon, L.; Cerda, M.; Chinellato, J.A.; Choi, K.; Chudoba, J.; Chytka, L.; Clay, R.W.; Cerutti, A.C.C.; Colalillo, R.; Coleman, A.; Coluccia, M.R.; Conceição, R.; Condorelli, A.; Consolati, G.; Contreras, F.; Convenga, F.; Covault, C.E.; Dasso, S.; Daumiller, K.; Dawson, B.R.; Day, J.A.; Almeida, R.M.D.; Jesús, J.D.; Jong, S.J.D.; De Mauro, G.; de Mello Neto, J.R.T.; De Mitri, I.; de Oliveira, J.; de Oliveira Franco, D.; de Souza, V.; De Vito, E.; Debatin, J.; del Río, M.; Deligny, O.; Dhital, N.; Matteo, A.D.; Dobrigkeit, C.; D’Olivo, J.C.; Dorosti, Q.; dos Anjos, R.C.; Dova, M.T.; Ebr, J.; Engel, R.; Epicoco, I.; Erdmann, M.; Escobar, C.O.; Etchegoyen, A.; Falcke, H.; Farmer, J.; Farrar, G.; Fauth, A.C.; Fazzini, N.; Feldbusch, F.; Fenu, F.; Fick, B.; Figueira, J.M.; Filipčič, A.; Fodran, T.; Freire, M.M.; Fujii, T.; Fuster, A.; Galea, C.; Galelli, C.; García, B.; Vegas, A.L.G.; Gemmeke, H.; Gesualdi, F.; Gherghel-Lascu, A.; Ghia, P.L.; Giaccari, U.; Giammarchi, M.; Giller, M.; Glombitza, J.; Gobbi, F.; Gollan, F.; Golup, G.; Berisso, M.G.; Vitale, P.F.G.; Gongora, J.P.; González, N.; Goos, I.; Góra, D.; Gorgi, A.; Gottowik, M.; Grubb, T.D.; Guarino, F.; Guedes, G.P.; Guido, E.; Hahn, S.; Halliday, R.; Hampel, M.R.; Hansen, P.; Harari, D.; Harvey, V.M.; Haungs, A.; Hebbeker, T.; Heck, D.; Hill, G.C.; Hojvat, C.; Hörandel, J.R.; Horvath, P.; Hrabovský, M.; Huege, T.; Hulsman, J.; Insolia, A.; Isar, P.G.; Johnsen, J.A.; Jurysek, J.; Kääpä, A.; Kampert, K.H.; Keilhauer, B.; Kemp, J.; Klages, H.O.; Kleifges, M.; Kleinfeller, J.; Köpke, M.; Mezek, G.K.; Lago, B.L.; Lahurd, D.; Lang, R.G.; Langner, N.; Leigui de Oliveira, M.A.; Lenok, V.; Letessier-Selvon, A.; Lhenry-Yvon, I.; Presti, D.L.; Lopes, L.; López, R.; Lorek, R.; Luce, Q.; Lucero, A.; Payeras, A.M.; Mancarella, G.; Mandat, D.; Manning, B.C.; Manshanden, J.; Mantsch, P.; Marafico, S.; Mariazzi, A.G.; Mariş, I.C.; Marsella, G.; Martello, D.; Martinez, H.; Bravo, O.M.; Mastrodicasa, M.; Mathes, H.J.; Matthews, J.; Matthiae, G.; Mayotte, E.; Mazur, P.O.; Medina-Tanco, G.; Melo, D.; Menshikov, A.; Merenda, K.-.; Michal, S.; Micheletti, M.I.; Miramonti, L.; Mockler, D.; Mollerach, S.; Montanet, F.; Morello, C.; Mostafá, M.; Müller, A.L.; Muller, M.A.; Mulrey, K.; Mussa, R.; Muzio, M.; Namasaka, W.M.; Nellen, L.; Niculescu-Oglinzanu, M.; Niechciol, M.; Nitz, D.; Nosek, D.; Novotny, V.; Nožka, L.; Nucita, A.; Núñez, L.A.; Palatka, M.; Pallotta, J.; Papenbreer, P.; Parente, G.; Parra, A.; Pech, M.; Pedreira, F.; Pekala, J.; Pelayo, R.; Peña-Rodriguez, J.; Armand, J.P.; Perlin, M.; Perrone, L.; Petrera, S.; Pierog, T.; Pimenta, M.; Pirronello, V.; Platino, M.; Pont, B.; Pothast, M.; Privitera, P.; Prouza, M.; Puyleart, A.; Querchfeld, S.; Rautenberg, J.; Ravignani, D.; Reininghaus, M.; Ridky, J.; Riehn, F.; Risse, M.; Ristori, P.; Rizi, V.; de Carvalho, W.R.; Rojo, J.R.; Roncoroni, M.J.; Roth, M.; Roulet, E.; Rovero, A.C.; Ruehl, P.; Saffi, S.J.; Saftoiu, A.; Salamida, F.; Salazar, H.; Salina, G.; Gomez, J.D.S.; Sánchez, F.; Santos, E.M.; Santos, E.; Sarazin, F.; Sarmento, R.; Sarmiento-Cano, C.; Sato, R.; Savina, P.; Schäfer, C.M.; Scherini, V.; Schieler, H.; Schimassek, M.; Schimp, M.; Schlüter, F.; Schmidt, D.; Scholten, O.; Schovánek, P.; Schröder, F.G.; Schröder, S.; Schulte, J.; Sciutto, S.J.; Scornavacche, M.; Shellard, R.C.; Sigl, G.; Silli, G.; Sima, O.; Šmída, R.; Sommers, P.; Soriano, J.F.; Souchard, J.; Squartini, R.; Stadelmaier, M.; Stanca, D.; Stanič, S.; Stasielak, J.; Stassi, P.; Streich, A.; Suárez-Durán, M.; Sudholz, T.; Suomijärvi, T.; Supanitsky, A.D.; Šupík, J.; Szadkowski, Z.; Taboada, A.; Tapia, A.; Timmermans, C.; Tkachenko, O.; Tobiska, P.; Peixoto, C.J.T.; Tomé, B.; Travaini, A.; Travnicek, P.; Trimarelli, C.; Trini, M.; Tueros, M.; Ulrich, R.; Unger, M.; Vaclavek, L.; Vacula, M.; Galicia, J.F.V.; Valore, L.; Varela, E.; Vásquez-Ramírez, A.; Veberič, D.; Ventura, C.; Quispe, I.D.V.; Verzi, V.; Vicha, J.; Vink, J.; Vorobiov, S.; Wahlberg, H.; Watson, A.A.; Weber, M.; Weindl, A.; Wiencke, L.; Wilczyński, H.; Winchen, T.; Wirtz, M.; Wittkowski, D.; Wundheiler, B.; Yushkov, A.; Zapparrata, O.; Zas, E.; Zavrtanik, D.; Zavrtanik, M.; Zehrer, L.; Zepeda, A.; Ziolkowski, M.

doi:10.3847/1538-4357/abb476

Results of a search for ultra-high-energy neutrinos with the Pierre Auger Observatory from the direction of the blazar TXS 0506+056 are presented. They were obtained as part of the follow-up that stemmed from the detection of high-energy neutrinos and gamma rays with IceCube, Fermi-LAT, MAGIC, and other detectors of electromagnetic radiation in several bands. The Pierre Auger Observatory is sensitive to neutrinos in the energy range from 100 PeV to 100 EeV and in the zenith-angle range from = 60 degrees to = 95 degrees, where the zenith angle is measured from the vertical direction. No neutrinos from the direction of TXS 0506+056 have been found. The results were analyzed in three periods: one of 6 months around the detection of IceCube-170922 A, coinciding with a flare period of TXS 0506+056, a second one of 110 days during which the IceCube collaboration found an excess of 13 neutrinos from a direction compatible with TXS 0506+056, and a third one from 2004 January 1 up to 2018 August 31, over which the Pierre Auger Observatory has been taking data. The sensitivity of the Observatory is addressed for different spectral indices by considering the fluxes that would induce a single expected event during the observation period. For indices compatible with those measured by the IceCube collaboration the expected number of neutrinos at the Observatory is well below one. Spectral indices as hard as 1.5 would have to apply in this energy range to expect a single event to have been detected.

A Search for Ultra-high-energy Neutrinos from TXS 0506+056 Using the Pierre Auger Observatory / A. Aab, P. Abreu, M. Aglietta, J.M. Albury, I. Allekotte, A. Almela, J. Alvarez-Muñiz, R.A. Batista, G.A. Anastasi, L. Anchordoqui, B. Andrada, S. Andringa, C. Aramo, P.R.A. Ferreira, H. Asorey, P. Assis, G. Avila, A.M. Badescu, A. Bakalova, A. Balaceanu, F. Barbato, R.J.B. Luz, K.H. Becker, J.A. Bellido, C. Berat, M.E. Bertaina, X. Bertou, P.L. Biermann, T. Bister, J. Biteau, J. Blazek, C. Bleve, M. Boháčová, D. Boncioli, C. Bonifazi, L.B. Arbeletche, N. Borodai, A.M. Botti, J. Brack, T. Bretz, F.L. Briechle, P. Buchholz, A. Bueno, S. Buitink, M. Buscemi, K.S. Caballero-Mora, L. Caccianiga, L. Calcagni, A. Cancio, F. Canfora, I. Caracas, J.M. Carceller, R. Caruso, A. Castellina, F. Catalani, G. Cataldi, L. Cazon, M. Cerda, J.A. Chinellato, K. Choi, J. Chudoba, L. Chytka, R.W. Clay, A.C.C. Cerutti, R. Colalillo, A. Coleman, M.R. Coluccia, R. Conceição, A. Condorelli, G. Consolati, F. Contreras, F. Convenga, C.E. Covault, S. Dasso, K. Daumiller, B.R. Dawson, J.A. Day, R.M.D. Almeida, J.D. Jesús, S.J.D. Jong, G. De Mauro, J.R.T. de Mello Neto, I. De Mitri, J. de Oliveira, D. de Oliveira Franco, V. de Souza, E. De Vito, J. Debatin, M. del Río, O. Deligny, N. Dhital, A.D. Matteo, C. Dobrigkeit, J.C. D’Olivo, Q. Dorosti, R.C. dos Anjos, M.T. Dova, J. Ebr, R. Engel, I. Epicoco, M. Erdmann, C.O. Escobar, A. Etchegoyen, H. Falcke, J. Farmer, G. Farrar, A.C. Fauth, N. Fazzini, F. Feldbusch, F. Fenu, B. Fick, J.M. Figueira, A. Filipčič, T. Fodran, M.M. Freire, T. Fujii, A. Fuster, C. Galea, C. Galelli, B. García, A.L.G. Vegas, H. Gemmeke, F. Gesualdi, A. Gherghel-Lascu, P.L. Ghia, U. Giaccari, M. Giammarchi, M. Giller, J. Glombitza, F. Gobbi, F. Gollan, G. Golup, M.G. Berisso, P.F.G. Vitale, J.P. Gongora, N. González, I. Goos, D. Góra, A. Gorgi, M. Gottowik, T.D. Grubb, F. Guarino, G.P. Guedes, E. Guido, S. Hahn, R. Halliday, M.R. Hampel, P. Hansen, D. Harari, V.M. Harvey, A. Haungs, T. Hebbeker, D. Heck, G.C. Hill, C. Hojvat, J.R. Hörandel, P. Horvath, M. Hrabovský, T. Huege, J. Hulsman, A. Insolia, P.G. Isar, J.A. Johnsen, J. Jurysek, A. Kääpä, K.H. Kampert, B. Keilhauer, J. Kemp, H.O. Klages, M. Kleifges, J. Kleinfeller, M. Köpke, G.K. Mezek, B.L. Lago, D. Lahurd, R.G. Lang, N. Langner, M.A. Leigui de Oliveira, V. Lenok, A. Letessier-Selvon, I. Lhenry-Yvon, D.L. Presti, L. Lopes, R. López, R. Lorek, Q. Luce, A. Lucero, A.M. Payeras, G. Mancarella, D. Mandat, B.C. Manning, J. Manshanden, P. Mantsch, S. Marafico, A.G. Mariazzi, I.C. Mariş, G. Marsella, D. Martello, H. Martinez, O.M. Bravo, M. Mastrodicasa, H.J. Mathes, J. Matthews, G. Matthiae, E. Mayotte, P.O. Mazur, G. Medina-Tanco, D. Melo, A. Menshikov, K.-. Merenda, S. Michal, M.I. Micheletti, L. Miramonti, D. Mockler, S. Mollerach, F. Montanet, C. Morello, M. Mostafá, A.L. Müller, M.A. Muller, K. Mulrey, R. Mussa, M. Muzio, W.M. Namasaka, L. Nellen, M. Niculescu-Oglinzanu, M. Niechciol, D. Nitz, D. Nosek, V. Novotny, L. Nožka, A. Nucita, L.A. Núñez, M. Palatka, J. Pallotta, P. Papenbreer, G. Parente, A. Parra, M. Pech, F. Pedreira, J. Pekala, R. Pelayo, J. Peña-Rodriguez, J.P. Armand, M. Perlin, L. Perrone, S. Petrera, T. Pierog, M. Pimenta, V. Pirronello, M. Platino, B. Pont, M. Pothast, P. Privitera, M. Prouza, A. Puyleart, S. Querchfeld, J. Rautenberg, D. Ravignani, M. Reininghaus, J. Ridky, F. Riehn, M. Risse, P. Ristori, V. Rizi, W.R. de Carvalho, J.R. Rojo, M.J. Roncoroni, M. Roth, E. Roulet, A.C. Rovero, P. Ruehl, S.J. Saffi, A. Saftoiu, F. Salamida, H. Salazar, G. Salina, J.D.S. Gomez, F. Sánchez, E.M. Santos, E. Santos, F. Sarazin, R. Sarmento, C. Sarmiento-Cano, R. Sato, P. Savina, C.M. Schäfer, V. Scherini, H. Schieler, M. Schimassek, M. Schimp, F. Schlüter, D. Schmidt, O. Scholten, P. Schovánek, F.G. Schröder, S. Schröder, J. Schulte, S.J. Sciutto, M. Scornavacche, R.C. Shellard, G. Sigl, G. Silli, O. Sima, R. Šmída, P. Sommers, J.F. Soriano, J. Souchard, R. Squartini, M. Stadelmaier, D. Stanca, S. Stanič, J. Stasielak, P. Stassi, A. Streich, M. Suárez-Durán, T. Sudholz, T. Suomijärvi, A.D. Supanitsky, J. Šupík, Z. Szadkowski, A. Taboada, A. Tapia, C. Timmermans, O. Tkachenko, P. Tobiska, C.J.T. Peixoto, B. Tomé, A. Travaini, P. Travnicek, C. Trimarelli, M. Trini, M. Tueros, R. Ulrich, M. Unger, L. Vaclavek, M. Vacula, J.F.V. Galicia, L. Valore, E. Varela, A. Vásquez-Ramírez, D. Veberič, C. Ventura, I.D.V. Quispe, V. Verzi, J. Vicha, J. Vink, S. Vorobiov, H. Wahlberg, A.A. Watson, M. Weber, A. Weindl, L. Wiencke, H. Wilczyński, T. Winchen, M. Wirtz, D. Wittkowski, B. Wundheiler, A. Yushkov, O. Zapparrata, E. Zas, D. Zavrtanik, M. Zavrtanik, L. Zehrer, A. Zepeda, M. Ziolkowski. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 902:2(2020), pp. 105.1-105.8. [10.3847/1538-4357/abb476]

A Search for Ultra-high-energy Neutrinos from TXS 0506+056 Using the Pierre Auger Observatory

Aab, A.;Abreu, P.;M. Aglietta;Albury, J. M.;Allekotte, I.;Almela, A.;Alvarez-Muñiz, J.;Batista, R. Alves;Anastasi, G. A.;Anchordoqui, L.;Andrada, B.;Andringa, S.;Aramo, C.;Ferreira, P. R. Araújo;Asorey, H.;Assis, P.;Avila, G.;Badescu, A. M.;Bakalova, A.;Balaceanu, A.;Barbato, F.;Luz, R. J. Barreira;Becker, K. H.;Bellido, J. A.;Berat, C.;Bertaina, M. E.;Bertou, X.;Biermann, P. L.;Bister, T.;Biteau, J.;Blazek, J.;Bleve, C.;Boháčová, M.;Boncioli, D.;Bonifazi, C.;Arbeletche, L. Bonneau;Borodai, N.;Botti, A. M.;Brack, J.;Bretz, T.;Briechle, F. L.;Buchholz, P.;Bueno, A.;Buitink, S.;Buscemi, M.;Caballero-Mora, K. S.;L. Caccianiga;L. Calcagni;Cancio, A.;Canfora, F.;Caracas, I.;Carceller, J. M.;Caruso, R.;Castellina, A.;Catalani, F.;G. Cataldi;Cazon, L.;Cerda, M.;Chinellato, J. A.;Choi, K.;Chudoba, J.;Chytka, L.;Clay, R. W.;Cerutti, A. C. Cobos;Colalillo, R.;Coleman, A.;Coluccia, M. R.;Conceição, R.;A. Condorelli;Consolati, G.;Contreras, F.;Convenga, F.;Covault, C. E.;Dasso, S.;Daumiller, K.;Dawson, B. R.;Day, J. A.;Almeida, R. M. de;Jesús, J. de;Jong, S. J. de;De Mauro, G.;de Mello Neto, J. R. T.;De Mitri, I.;de Oliveira, J.;de Oliveira Franco, D.;V. de Souza;De Vito, E.;Debatin, J.;del Río, M.;Deligny, O.;Dhital, N.;Matteo, A. Di;Dobrigkeit, C.;D’Olivo, J. C.;Dorosti, Q.;dos Anjos, R. C.;Dova, M. T.;Ebr, J.;Engel, R.;Epicoco, I.;Erdmann, M.;Escobar, C. O.;Etchegoyen, A.;Falcke, H.;Farmer, J.;Farrar, G.;Fauth, A. C.;Fazzini, N.;Feldbusch, F.;Fenu, F.;Fick, B.;Figueira, J. M.;Filipčič, A.;Fodran, T.;Freire, M. M.;Fujii, T.;Fuster, A.;Galea, C.;C. Galelli;García, B.;Vegas, A. L. Garcia;Gemmeke, H.;Gesualdi, F.;Gherghel-Lascu, A.;Ghia, P. L.;Giaccari, U.;M. Giammarchi;Giller, M.;Glombitza, J.;F. Gobbi;Gollan, F.;Golup, G.;Berisso, M. Gómez;Vitale, P. F. Gómez;Gongora, J. P.;González, N.;Goos, I.;Góra, D.;Gorgi, A.;Gottowik, M.;Grubb, T. D.;Guarino, F.;Guedes, G. P.;Guido, E.;Hahn, S.;Halliday, R.;Hampel, M. R.;P. Hansen;Harari, D.;Harvey, V. M.;Haungs, A.;Hebbeker, T.;Heck, D.;Hill, G. C.;Hojvat, C.;Hörandel, J. R.;Horvath, P.;Hrabovský, M.;Huege, T.;Hulsman, J.;Insolia, A.;Isar, P. G.;Johnsen, J. A.;Jurysek, J.;Kääpä, A.;Kampert, K. H.;Keilhauer, B.;Kemp, J.;Klages, H. O.;Kleifges, M.;Kleinfeller, J.;Köpke, M.;Mezek, G. Kukec;Lago, B. L.;LaHurd, D.;Lang, R. G.;Langner, N.;Leigui de Oliveira, M. A.;Lenok, V.;Letessier-Selvon, A.;Lhenry-Yvon, I.;Presti, D. Lo;L. Lopes;López, R.;Lorek, R.;Luce, Q.;Lucero, A.;Payeras, A. Machado;Mancarella, G.;Mandat, D.;Manning, B. C.;Manshanden, J.;Mantsch, P.;Marafico, S.;Mariazzi, A. G.;Mariş, I. C.;Marsella, G.;Martello, D.;Martinez, H.;Bravo, O. Martínez;Mastrodicasa, M.;Mathes, H. J.;Matthews, J.;Matthiae, G.;Mayotte, E.;Mazur, P. O.;Medina-Tanco, G.;Melo, D.;Menshikov, A.;Merenda, K. -D.;Michal, S.;Micheletti, M. I.;L. Miramonti;Mockler, D.;Mollerach, S.;Montanet, F.;C. Morello;Mostafá, M.;Müller, A. L.;Muller, M. A.;Mulrey, K.;Mussa, R.;M. Muzio;Namasaka, W. M.;Nellen, L.;Niculescu-Oglinzanu, M.;Niechciol, M.;Nitz, D.;Nosek, D.;Novotny, V.;Nožka, L.;A. Nucita;Núñez, L. A.;Palatka, M.;Pallotta, J.;Papenbreer, P.;Parente, G.;Parra, A.;Pech, M.;Pedreira, F.;Pekala, J.;Pelayo, R.;Peña-Rodriguez, J.;Armand, J. Perez;Perlin, M.;Perrone, L.;Petrera, S.;Pierog, T.;Pimenta, M.;Pirronello, V.;Platino, M.;Pont, B.;Pothast, M.;P. Privitera;Prouza, M.;Puyleart, A.;Querchfeld, S.;Rautenberg, J.;Ravignani, D.;Reininghaus, M.;Ridky, J.;Riehn, F.;Risse, M.;Ristori, P.;Rizi, V.;de Carvalho, W. Rodrigues;Rojo, J. Rodriguez;Roncoroni, M. J.;Roth, M.;Roulet, E.;Rovero, A. C.;Ruehl, P.;Saffi, S. J.;Saftoiu, A.;Salamida, F.;Salazar, H.;G. Salina;Gomez, J. D. Sanabria;Sánchez, F.;Santos, E. M.;Santos, E.;Sarazin, F.;Sarmento, R.;Sarmiento-Cano, C.;Sato, R.;Savina, P.;Schäfer, C. M.;V. Scherini;Schieler, H.;Schimassek, M.;Schimp, M.;Schlüter, F.;Schmidt, D.;Scholten, O.;Schovánek, P.;Schröder, F. G.;Schröder, S.;Schulte, J.;Sciutto, S. J.;Scornavacche, M.;Shellard, R. C.;Sigl, G.;Silli, G.;Sima, O.;Šmída, R.;Sommers, P.;Soriano, J. F.;Souchard, J.;Squartini, R.;Stadelmaier, M.;Stanca, D.;Stanič, S.;Stasielak, J.;Stassi, P.;Streich, A.;Suárez-Durán, M.;Sudholz, T.;Suomijärvi, T.;Supanitsky, A. D.;Šupík, J.;Szadkowski, Z.;Taboada, A.;Tapia, A.;Timmermans, C.;Tkachenko, O.;Tobiska, P.;Peixoto, C. J. Todero;Tomé, B.;A. Travaini;Travnicek, P.;Trimarelli, C.;Trini, M.;Tueros, M.;Ulrich, R.;Unger, M.;Vaclavek, L.;Vacula, M.;Galicia, J. F. Valdés;Valore, L.;Varela, E.;Vásquez-Ramírez, A.;Veberič, D.;Ventura, C.;Quispe, I. D. Vergara;Verzi, V.;Vicha, J.;Vink, J.;Vorobiov, S.;Wahlberg, H.;Watson, A. A.;Weber, M.;Weindl, A.;Wiencke, L.;Wilczyński, H.;Winchen, T.;Wirtz, M.;Wittkowski, D.;Wundheiler, B.;Yushkov, A.;Zapparrata, O.;Zas, E.;Zavrtanik, D.;Zavrtanik, M.;Zehrer, L.;Zepeda, A.;Ziolkowski, M.

2020

Abstract

Results of a search for ultra-high-energy neutrinos with the Pierre Auger Observatory from the direction of the blazar TXS 0506+056 are presented. They were obtained as part of the follow-up that stemmed from the detection of high-energy neutrinos and gamma rays with IceCube, Fermi-LAT, MAGIC, and other detectors of electromagnetic radiation in several bands. The Pierre Auger Observatory is sensitive to neutrinos in the energy range from 100 PeV to 100 EeV and in the zenith-angle range from = 60 degrees to = 95 degrees, where the zenith angle is measured from the vertical direction. No neutrinos from the direction of TXS 0506+056 have been found. The results were analyzed in three periods: one of 6 months around the detection of IceCube-170922 A, coinciding with a flare period of TXS 0506+056, a second one of 110 days during which the IceCube collaboration found an excess of 13 neutrinos from a direction compatible with TXS 0506+056, and a third one from 2004 January 1 up to 2018 August 31, over which the Pierre Auger Observatory has been taking data. The sensitivity of the Observatory is addressed for different spectral indices by considering the fluxes that would induce a single expected event during the observation period. For indices compatible with those measured by the IceCube collaboration the expected number of neutrinos at the Observatory is well below one. Spectral indices as hard as 1.5 would have to apply in this energy range to expect a single event to have been detected.

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	Parole chiave
	
				High energy astrophysics; Neutrino astronomy; Blazars; Transient sources; Active galaxies
			
	Settori scientifico-disciplinari dell'articolo (sola visualizzazione)
	
				Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
Settore FIS/05 - Astronomia e Astrofisica
			
	Data di pubblicazione
	
				2020
			
	Rivista in ANCE
	
				THE ASTROPHYSICAL JOURNAL
			
	DOI
	
				https://dx.doi.org/10.3847/1538-4357/abb476
			
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				01 - Articolo su periodico

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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1033212

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