TA 4. H. Sagawa. Institute for Cosmic Ray Research The University of Tokyo for Telescope Array collaboration
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1 TA 4 H. Sagawa Institute for Cosmic Ray Research The University of Tokyo for Telescope Array collaboration 2014/10/13 H. Sagawa@UHECR2014 1
2 Outline Telescope Array (TA) Recent TA results 5- or 6-year data 2014/10/13 H. 2
3 Outline Telescope Array (TA) TA 4 extension Recent TA results 5- or 6- year data 2014/10/13 H. Sagawa@UHECR2014 3
4 5 countries, 126 researchers Telescope Array Collaboration R.U. Abbasi 1, M. Abe 13, T.Abu-Zayyad 1, M. Allen 1, R. Anderson 1, R. Azuma 2, E. Barcikowski 1, J.W. Belz 1, D.R. Bergman 1, S.A. Blake 1, R. Cady 1, M.J. Chae 3, B.G. Cheon 4, J. Chiba 5, M. Chikawa 6, W.R. Cho 7, T. Fujii 8, M. Fukushima 8,9, T. Goto 10, W. Hanlon 1, Y. Hayashi 10, N. Hayashida 11, K. Hibino 11, K. Honda 12, D. Ikeda 8, N. Inoue 13, T. Ishii 12, R. Ishimori 2, H. Ito 14, D. Ivanov 1, C.C.H. Jui 1, K. Kadota 16, F. Kakimoto 2, O. Kalashev 17, K. Kasahara 18, H. Kawai 19, S. Kawakami 10, S. Kawana 13, K. Kawata 8, E. Kido 8, H.B. Kim 4, J.H. Kim 1, J.H. Kim 25, S. Kitamura 2, Y. Kitamura 2, V. Kuzmin 17, Y.J. Kwon 7, J. Lan 1, S.I. Lim 3, J.P. Lundquist 1, K. Machida 12, K. Martens 9, T. Matsuda 20, T. Matsuyama 10, J.N. Matthews 1, M. Minamino 10, K. Mukai 12, I. Myers 1, K. Nagasawa 13, S. Nagataki 14, T. Nakamura 21, T. Nonaka 8, A. Nozato 6, S. Ogio 10, J. Ogura 2, M. Ohnishi 8, H. Ohoka 8, K. Oki 8, T. Okuda 22, M. Ono 14, A. Oshima 10, S. Ozawa 18, I.H. Park 23, M.S. Pshirkov 24, D.C. Rodriguez 1, G. Rubtsov 17, D. Ryu 25, H. Sagawa 8, N. Sakurai 10, A.L. Sampson 1, L.M. Scott 15, P.D. Shah 1, F. Shibata 12, T. Shibata 8, H. Shimodaira 8, B.K. Shin 4, J.D. Smith 1, P. Sokolsky 1, R.W. Springer 1, B.T. Stokes 1, S.R. Stratton 1,15, T.A. Stroman 1, T. Suzawa 13, M. Takamura 5, M. Takeda 8, R. Takeishi 8, A. Taketa 26,M. Takita 8, Y. Tameda 11, H. Tanaka 10, K. Tanaka 27, M. Tanaka 20, S.B. Thomas 1, G.B. Thomson 1, P. Tinyakov 17,24, I. Tkachev 17, H. Tokuno 2, T. Tomida 28, S. Troitsky 17, Y. Tsunesada 2, K. Tsutsumi 2, Y. Uchihori 29, S. Udo 11, F. Urban 24, G. Vasiloff 1, T. Wong 1, R. Yamane 10, H. Yamaoka 20, K. Yamazaki 10, J. Yang 3, K. Yashiro 5, Y. Yoneda 10, S. Yoshida 19, H. Yoshii 30, R. Zollinger 1, Z. Zundel 1 1 University of Utah 2 Tokyo Institute of Technology 3 Ewha Womans University 4 Hanyang University 5 Tokyo University of Science 6 Kinki University 7 Yonsei University 8 ICRR, University of Tokyo 9 IPMU, the University of Tokyo 10 Osaka City University 11 Kanagawa University 12 University of Yamanashi 13 Saitama University 14 Astrophysical Big Bang Laboratory RIKEN, Wako 15 Rutgers University 16 Tokyo City University17 INR of the Russian Academy of Sciences 18 Waseda University 19 Chiba University 20 KEK 21 Kochi University 22 Ritsumeikan University 23 Sungkyunkwan University 24 Universite de Libre de Bruxelles 25 Ulsan National Institute of Science and Technology 26 ERI, University of Tokyo 27 Hiroshima City University 28 Advanced Science Institute, RIKEN 29 National Institute of Radiological Science 30 Ehime University 2014/10/13 H. Sagawa@UHECR2014 4
5 Telescope Array detector Utah, USA - lat N, long W Refurbished HiRes 32km Surface Detector (SD) 3m 2 scintillator detector 507SDs, 1.2km spacing ~700km 2 Fluorescence Detector (FD) 28km 2014/10/13 H. Sagawa@UHECR2014 Elevation angle:3~33 Hybrid observation since Mar,
6 Recent TA results Anisotropy (hot spot) Mass composition (Xmax) Energy spectrum 2014/10/13 H. 6
7 Anisotropy of arrival directions of highestenergy cosmic rays (hotspot) TA SD data 5 years (2008/May ~ 2013/May) E > ev 以上, zenith angle < 55 :72 events distribution of arrival directions (blue points) GC TA FoV (Dec. > -10 ) Equatorial coordinates 2014/10/13 H. Sagawa@UHECR2014 7
8 Hotspot Anisotropy of highest-energy cosmic rays oversampling using 20-degree radius circles Significance map 5-year data Maximum significance direction:r.a. = 146.7, Dec. = 43.2 observed:19 (19/72=26%) Expected for isotropy:4.5 (4.5/72=6%) Li-Ma significance: 5.1σσ Chance probability to obtain maximum significance of 5.1σσ:3.7x10-4 (3.4σσ) MC:15, 20, 25, 30, 35 -radius circles ApJ 790, L21 (2014) 2014/10/13 H. Sagawa@UHECR2014 8
9 Hotspot +1-year data D.Bergman COSPAR /May ~ 2014/May (6 years) Arrival direction distribution Significance map blue:5-year data red: recent 1-year data E > 5.7x10 19 ev: 72 events 87 events(+15) Hotspot : 19events 23 events( +4) Max. Li-Ma significance: 5.1σσ 5.55σσ 5 yrs +1 yr (19/72~26%, 4/15~26%) Chance prob. = 3.4σσ 4.0σσ (3.1x10-5 ) 2014/10/13 H. Sagawa@UHECR2014 9
10 Compatibility with isotropy Autocorrelation p ~ (δ ~ 20 o 25 o ) AGN p ~ LSS p ~ /10/13 H. Sagawa@UHECR
11 (MD FD + SD) J.N.Matthews Qui Nhon 2014 arxiv: Submitted to APP Xmax analysis by hybrid events MD FD: [refurbished HiRes] + SD 18.2 < log 10 (E/eV) < 18.4 Black points:ta data MC(QGSJET-II-03) blue:proton, red:fe hybrid log 10 (E/eV) > 19 consistent with a light, largely protonic composition 2014/10/13 H. Sagawa@UHECR
12 TA energy spectrum D.Bergman COSPAR 2014 SD data:2008/may~2014/may (6 years) 19.74± ±0.02 ankle Cutoff consistent with GZK cutoff E > ev Expected (no cutoff) = observed = 32 Cutoff chance prob. = 6.59σσ 2014/10/13 H. Sagawa@UHECR
13 Model of extremely-high-energy cosmic rays source Extragalactic proton CR Distribution cases isotropic LSS (2MASS < 250 Mpc) Evolution (1+z) m propagation Propagation code Kalashev + Kido, arxiv: Photon background CMB IRB No GMF and no extra GMF Injection spectrum E -P Energy scale Flux normalization factor 4 fit parameters z year TA SD data If GZK cutoff exists, sources of highest-energy CRs which arrive at the earth are restricted to nearby objests 2014/10/13 H. Sagawa@UHECR
14 Ursa Major cluster (D=20Mpc) Nearby galaxies (within ~50 Mpc) Virgo cluster (D=20Mpc) 2MASS catalog John P. Huchra, et al 2012, ApJ, 199, 26 + TA 5-year significance (color map) 2014/10/13 H. Sagawa@UHECR2014 Distribution of galaxies: anisotropic Anisotropy of arrival directions of highest-energy cosmic rays 14
15 TA 4 proposal Quadrule TA SD (~3000 km 2 ) 500 scintillator SDs 2.1 km spacing (Japan) 2 FD stations each with 10 refurbished HiRes telescopes (US) Apply grants this fall (Japan, US) + from Korea, Russia 2-year construction 3-year observation TA SD: 21 year data TA hybrid: 18 year data 2014/10/13 H. Sagawa@UHECR
16 Efficiency for additional TA 4 SD array Differential for energies 57 EeV Trigger condition. 3 MIPS. 3-fold SDs. < 8x2.08/1.2usec Reconstruction. NSD 4 Trig. eff Trig+recon TA SD reconstruction efficiency =100% for E > ev 2014/10/13 H. Sagawa@UHECR
17 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
18 Arrival directions of TA 6-year data 2014/10/13 H. 18
19 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
20 Nearby Galaxy Clusters and hotspot Ursa Major Cluster (D=20Mpc) Perseus-Pisces Supercluster (D=70Mpc) Virgo Cluster (D=20Mpc) 2MASS catalog velocity km/s John P. Huchra, et al 2012, ApJ, 199, year TA data (Color contour) 2014/10/13 H. Sagawa@UHECR2014 Heliocentric velocity (Rough Distance) Red: km/s (D = 0-15Mpc) Blue: km/s (D = 15-30Mpc) Green: km/s (D = 30-45Mpc) 20
21 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Galactic filaments? Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
22 Nearby Galaxy Clusters and hotspot Ursa Major Cluster (D=20Mpc) Perseus-Pisces Supercluster (D=70Mpc) Virgo Cluster (D=20Mpc) 2MASS catalog velocity km/s John P. Huchra, et al 2012, ApJ, 199, year TA data (Color contour) 2014/10/13 H. Sagawa@UHECR2014 Heliocentric velocity (Rough Distance) Red: km/s (D = 0-15Mpc) Blue: km/s (D = 15-30Mpc) Green: km/s (D = 30-45Mpc) 22
23 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
24 Search for clusters of highest energy cosmic rays E > 5.7x10 19 ev doublet Auger 123 EeV TA 136 EeV new event TA 101 EeV TA: 2008/May 2013/May (5 yrs) 72 events [ApJ 790 (2014) L21] Auger: 2004/Jan 2009/Dec (5.5yrs) 62 events [APP 34 (2010) 314] Hint of a point source? 2014/10/13 H. Sagawa@UHECR
25 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
26 TA and Auger pretrial significance summed over with 20 o -radius Circle TA Hotspot 5.1σ Adopted same analysis as the TA Auger 3σ around Cen A 2014/10/13 H. Sagawa@UHECR
27 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
28 Prospect in the summer of 2020 If we start TAx4 project in 2015, construction of new detectors operation of full TAx4 2014/10/13 H. 28
29 Arrival directions of TA 6-year data 2014/10/13 H. 29
30 1 cluster in the hotspot in the summer of /10/13 H. 30
31 2 clusters in the hotspot in the summer of /10/13 H. 31
32 2 clusters in the hotspot+perseus cluster in the summer of /10/13 H. 32
33 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
34 TA and Auger energy spectrum 2014/10/13 H. 34
35 Spectrum by TA SD for 6 years (this conf.) 2014/10/13 H. Sagawa@UHECR
36 Spectrum by TA SD for 7 years in the summer of /10/13 H. Sagawa@UHECR
37 Spectrum only by TA SD for 12 years in the summer of /10/13 H. 37
38 Spectrum by (TA SD for 9 years and TAx4 for 3 years) in the summer of /10/13 H. Sagawa@UHECR
39 Spectrum by (TA SD for 9 years and TAx4 for 3 years) together with other cases in the summer of /10/13 H. Sagawa@UHECR
40 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays around cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
41 Xmax for TA hybrid events for 9 years and TAx4 hybrid events for 3 years (assuming proton QGSJET II-03 model) TA hybrid events for corresponding to 18-year TA hybrid events 2014/10/13 H. Sagawa@UHECR
42 Prospect of TA 4 Arrival direction Hotspot Confirmation at > 5σσ level Fine structure? Other excess spots? Study of galactic MF and extragalactic MF Point source search Correlation with the results by other experiments TA/Auger whole sky analysis Search for correlation with gamma-ray sources by MAGIC etc. Search for correlation with IceCube neutrinos Measurement of spectrum and Xmax of cosmic rays above cutoff with high statistics Search for UHE gamma rays and neutrinos 2014/10/13 H. Sagawa@UHECR
43 TA 5- or 6- year data Hotspot: anisotropy of cosmic rays with E > ev (post-trial 4σ) consistent with a light, largely protonic composition (E > ev) Spectrum breaks consistent with GZK cutoff (6.6σ) e + e - production dip Summary TA 4 Quadruple TA SD 2 more FDs Nearby extragalactic universe exploring by highest-energy cosmic rays 2014/10/13 H. Sagawa@UHECR
44 END 2014/10/13 H. 44
45 TALE+TA spectrum (E > ev) (FD) (SD) Energy region over > 4 decades TA: 6 year SD data TALE Observation time:144 hours (2013/Sep/6 ~ 2013/Dec/6) TALE Ckov: Cherenkov component is major Breaks at around ev and ev 2014/10/13 H. Sagawa@UHECR
46 Statistical test for compatibility with LSS and isotropy 2014/10/13 H. 46
47 Correlation with AGN from VCV catalog 6-year TA SD data zenith angles < 45 : AGN: : TA events correlating within 3.1 : non-correlating events Galactic coordinates Ntot = 53, Ncor = 21, (40%) Nbg = 12.5 (24%) p-value = (2.7σσ) 2014/10/13 H. Sagawa@UHECR
48 Correlation with AGN from VCV catalog 2014/10/13 H. 48
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