Array Experiment. Results from the Telescope. Charlie Jui. University of Utah TeVPA 2013 Irvine, CA Aug. 27, 2013
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1 Results from the Telescope Array Experiment Charlie Jui University of Utah TeVPA 2013 Irvine, CA Aug. 27, TA, TeVPA2013 1
2 Telescope Array Collaboration T. Abu-Zayyada, M. Allena, R. Andersona, R. Azumab, E. Barcikowskia, J. W. Belza, D. R. Bergmana, S. A. Blakea, R. Cadya, M. J. Chaec, B. G. Cheond, J. Chibae, M. Chikawaf, W. R. Chog, T. Fujiih, M. Fukushimah,i, K. Gotoj, W. Hanlona, Y. Hayashij, N. Hayashidak, K. Hibinok, K. Hondal, D. Ikedah, N. Inouem, T. Ishiil, R. Ishimorib, H. Iton, D. Ivanova,o, C. C. H. Juia, K. Kadotap, F. Kakimotob, O. Kalashevq, K. Kasaharar, H. Kawais, S. Kawakamij, S. Kawanam, K. Kawatah, E. Kidoh, H. B. Kimd, J. H. Kima, J. H. Kimd, S. Kitamurab, Y. Kitamurab, V. Kuzminq, Y. J. Kwong, J. Lana, J.P. Lundquista, K. Machidal, K. Martensi, T. Matsudat, T. Matsuyamaj, J. N. Matthewsa, M. Minaminoj, K. Mukail, I. Myersa, K. Nagasawam, S. Nagatakin, T. Nakamurau, H. Nanpeij, T. Nonakah, A. Nozatof, S. Ogioj, S. Ohc, M. Ohnishih, H. Ohokah, K. Okih, T. Okudav, M. Onon, A. Oshimaj, S. Ozawar, I. H. Parkw, M. S. Pshirkovx, D. C. Rodrigueza, G. Rubtsovq, D. Ryuy, H. Sagawah, N. Sakuraij, A. L. Sampsona, L. M. Scotto, P. D. Shaha, F. Shibatal, T. Shibatah, H. Shimodairah, B. K. Shind, T. Shirahamam, J. D. Smitha, P. Sokolskya, R. W. Springera, B. T. Stokesa, S. R. Strattona,o, T. A. Stromana, M. Takamurae, A. Taketaz, M. Takitah, Y. Tamedak, H. Tanakaj, K. Tanakaaa, M. Tanakat, S. B. Thomasa, G. B. Thomsona, P. Tinyakovq,x, I. Tkachevq, H. Tokunob, T. Tomidaab, S. Troitskyq, Y. Tsunesadab, K. Tsutsumib, Y. Uchihoriac, F. Urbanx, G. Vasiloffa, Y. Wadam, T. Wonga, H. Yamaokat, K. Yamazakij, J. Yangc, K. Yashiroe, Y. Yonedaj, S. Yoshidas, H. Yoshiiad, R. Zollingera, Z. Zundela auniversity of Utah, btokyo Institute of Technology, cewha Womans University, dhanyang University, etokyo University of Science, fkinki University, gyonsei University, hinstitute for Cosmic Ray Research, Univ. of Tokyo, ikavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, the University of Tokyo, josaka City University, kkanagawa University, luniv. of Yamanashi, msaitama University, nastrophysical Big Bang Laboratory, RIKEN, orutgers University, ptokyo City University, qinstitute for Nuclear Research of the Russian Academy of Sciences, rwaseda University, schiba University, tinstitute of Particle and Nuclear Studies, KEK, ukochi University, vritsumeikan University, wsungkyunkwan University, xuniversite Libre de Bruxelles, ychungnam National University, zearthquake Research Institute, University of Tokyo, aahiroshima City University, abadvanced Science Institute, RIKEN, acnational Institute of Radiological Science, adehime University 6 TA, TeVPA2013 2
3 Telescope Array Collaboration T. Abu-Zayyada, M. Allena, R. Andersona, R. Azumab, E. Barcikowskia, J. W. Belza, D. R. Bergmana, S. A. Blakea, R. Cadya, M. J. Chaec, B. G. Cheond, J. Chibae, M. Chikawaf, W. R. Chog, T. Fujiih, M. Fukushimah,i, K. Gotoj, W. Hanlona, Y. Hayashij, N. Hayashidak, K. Hibinok, K. Hondal, D. Ikedah, N. Inouem, T. Ishiil, R. Ishimorib, H. Iton, D. Ivanova,o, C. C. H. Juia, K. Kadotap, F. Kakimotob, O. Kalashevq, K. Kasaharar, H. Kawais, S. Kawakamij, S. Kawanam, ~120 K. Kawatah, collaborators E. Kidoh, H. B. Kimd, in J. H. 5 Kima, countries J. H. Kimd, S. Kitamurab, Y. Kitamurab, V. Kuzminq, Y. J. Kwong, J. Lana, J.P. Lundquista, K. Machidal, K. Martensi, T. Matsudat, T. Matsuyamaj, J. N. Matthewsa, M. Minaminoj, Japan, K. Mukail, USA, I. Korea, Myersa, K. Nagasawam, Russia, S. Belgium Nagatakin, T. Nakamurau, H. Nanpeij, T. Nonakah, A. Nozatof, S. Ogioj, S. Ohc, M. Ohnishih, H. Ohokah, K. Okih, T. Okudav, M. Onon, A. Oshimaj, S. Ozawar, I. H. Parkw, M. S. Pshirkovx, D. C. Rodrigueza, G. Rubtsovq, D. Ryuy, H. Sagawah, N. Sakuraij, A. L. Sampsona, L. M. Scotto, P. D. Shaha, F. Shibatal, T. Shibatah, H. Shimodairah, B. K. Shind, T. Shirahamam, J. D. Smitha, P. Sokolskya, R. W. Springera, B. T. Stokesa, S. R. Strattona,o, T. A. Stromana, M. Takamurae, A. Taketaz, M. Takitah, Y. Tamedak, H. Tanakaj, K. Tanakaaa, M. Tanakat, S. B. Thomasa, G. B. Thomsona, P. Tinyakovq,x, I. Tkachevq, H. Tokunob, T. Tomidaab, S. Troitskyq, Y. Tsunesadab, K. Tsutsumib, Y. Uchihoriac, F. Urbanx, G. Vasiloffa, Y. Wadam, T. Wonga, H. Yamaokat, K. Yamazakij, J. Yangc, K. Yashiroe, Y. Yonedaj, S. Yoshidas, H. Yoshiiad, R. Zollingera, Z. Zundela auniversity of Utah, btokyo Institute of Technology, cewha Womans University, dhanyang University, etokyo University of Science, fkinki University, gyonsei University, hinstitute for Cosmic Ray Research, Univ. of Tokyo, ikavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, the University of Tokyo, josaka City University, kkanagawa University, luniv. of Yamanashi, msaitama University, nastrophysical Big Bang Laboratory, RIKEN, orutgers University, ptokyo City University, qinstitute for Nuclear Research of the Russian Academy of Sciences, rwaseda University, schiba University, tinstitute of Particle and Nuclear Studies, KEK, ukochi University, vritsumeikan University, wsungkyunkwan University, xuniversite Libre de Bruxelles, ychungnam National University, zearthquake Research Institute, University of Tokyo, aahiroshima City University, abadvanced Science Institute, RIKEN, acnational Institute of Radiological Science, adehime University 6 TA, TeVPA2013 3
4 TA, TeVPA Telescope Array Experiment TA is a ultrahigh energy (>10 17 ev) cosmic ray observatory located in the West Desert of Utah: largest in the northern hemisphere
5 TARA (TA Radar) TARA Presentations at TeVPA2013: Tue. Aug 27 14:24 Jordan HANSON 14:48: Samridha KUNWAR An R&D project to observe radar reflections form cosmic ray air showers TARA1.5 April 2011 to July kw TARA40 Summer 2013~ kw 41 TA, TeVPA2013 5
6 Outline 1. Introduction to Telescope Array 2. Data Analysis Techniques 3. Energy Spectrum 4. Composition 5. Photons and Neutrinos??? 6. Anisotropy TA, TeVPA2013 6
7 1. Introduction TA Detectors TA is a hybrid experiment 507 scintillation counters surface detector (SD) Covers 730 km 2. 3 fluorescence detector (FD) stations Located at the corners of the SD array Black Rock FD Middle Drum FD Long Ridge FD TA, TeVPA2013 7
8 Scintillation Counters Pre-assembled in Japan, Final Assby/testing in Delta: 2 layers, 1.25 cm scintillator, 3m 2 area TA, TeVPA2013 8
9 TA, TeVPA Scintillator Detectors on a 1.2 km square grid Power: Solar/Battery Readout: Radio Self-calibrated: µ background Operational: 3/2008
10 Refurbished from HiRes-I TA Fluorescence Detectors Middle Drum PMTs/camera Observations since ~10/ m 2 New FDs Observation since ~11/2007 Long Ridge Observation since ~6/2007 Black Rock Mesa 12 telescopes/station 256 PMTs/camera Hamamatsu R9508 FOV~15x18deg 6.8 m ~1 m 2 2 TA, TeVPA
11 TA, TeVPA Example Event from MD MD mono BR mono θ [ o ] φ [ o ] x[km] y[km] Stereo BR&LR LR SD BR
12 TA, TeVPA Data Analysis FD Geometrical Reconstruction The trajectory of the EAS can be determined in one of two ways: 1. Monocular reconstruction using the arrival time of light signal at the detector. 2. By intersecting the shower-detector planes (SDP) seen from the two detector sites RP θi ti = t0 + tan c 2
13 Measurement of a fluorescence Event Event Display Black Rock Mesa Fluorescence Direct (Cerenkov) Rayleigh scatt. Aerosol scatt. Monocular timing fit Reconstructed Shower Profile TA, TeVPA
14 Hybrid Reconstruction Primary Cosmic Ray UV Fluorescence Photons Isotropic Emission FD mono has ~5 ang. resolution Adding SD ~0.5 resolution. Charged Particles Electromagnetic Shower ( Stereo FD resolution ~0.5 ) RED: Surface Detector Virtual PMT 3. Hybrid reconstruction: Incorporating timing information of SD into FD geometry fit BLACK: Fluorescence Telescope PMT TA, TeVPA
15 2008/Jun/25-19:45: UTC Analyzing SD Event Geometry Fit (modified Linsley) Fit with AGASA LDF Lateral Density Distribution Fit r = 800m S(800): Primary Energy Zenith attenuation by MC TA, TeVPA
16 Surface Array Energy Measurement Energy table is constructed using the MC (CORSIKA) Determination of event energy by interpolating between S800 vs. sec(θ) lines Uses novel dethinning of CORSIKA (paper draft in internal review) TA, TeVPA
17 TA, TeVPA Energy Spectrum of UHECR The TA Collaboration was in part a merger of the High Resolution Fly s Eye (HiRes) and the Akeno Giant Air Shower Array (AGASA) AGASA flux systematically ~50% higher than HiRes AGASA: continuing spectrum seen Differential flux multiplied by E 3 To highlight the subtle features in a steeply falling spectrum HiRes: GZK suppression At 5σ significance
18 TA, TeVPA Energy Scale Check and resolution FD energy EFD Hybrid events E > 1019 ev Angular resolution = 1.4o SD energy ESD (scaled to FD energy) EESSSS = EE SSSS/1.27 E > 1019 ev Energy resolution < 20%
19 5 year TA SD spectrum July, 2013 TA data May, 2008 May, 2013 Zenith angle < 45o ev. (E > ev) Exposure 4500 km2 sr yr Broken power law fit 4-year TA surface detector spectrum TA, TeVPA2013 Astrophysical Journal Letters 768 L1 (2013) 19
20 Spectrum Summary Doug Bergman for the TA Colaboration: ICRC /indico/getFile.py /access?contribid=2 21&sessionId=3&res Id=0&materialId=sli des&confid=0 TA Hybrid Spectrum papers TA Monocular FD spectrum papers arxiv: [astro-ph.he], Astroparticle Physics (2012) TA, TeVPA2013 submitted to Astroparticle Physics Astroparticle Physics 48 (2013)
21 TA, TeVPA Significance and energy of suppression TA SD 5-year Locations of the ankle/dip and of the suppression are consistent with interaction of protons with the CMBR
22 TA, TeVPA Composition AUGER: Phys.Rev.Lett.104:091101,2010 Suggests shift to heavier composition at higher energies: Hybrid HiRes: Phys.Rev.Lett.104:161101,2010 (with Xmax data suppl.) consistent with predominately light (protons) composition Stereo
23 TA Stereo Composition Camera images LR BR Longitudinal Shower Profiles Fluorescence Cherenkov TA, TeVPA
24 TA, TeVPA <Xmax> vs LogE 5-year data (Nov., 2007 Nov. 2012) Y. Sunesada for the TA Collaboration ICRC /access?contribid=132&sessionid=3&re sid=0&materialid=slides&confid=0 TA data consistent with (QGSJET-II.3) protons
25 TA, TeVPA Comparing Xmax Distribution with MC p/fe expectations: Stereo TA data consistent with (QGSJET-II.3) protons
26 TA, TeVPA Comparing Xmax Distribution with MC p/fe expectations: Stereo TA data consistent with (QGSJET-II.3) protons
27 TA, TeVPA Comparing Xmax Distribution with MC p/fe expectations: Stereo TA data consistent with (QGSJET-II.3) protons
28 TA, TeVPA Hybrid Analysis <Xmax> vs LogE 4-year data (May, 2008 May, 2012) TA data consistent with (QGSJET-II.3) protons
29 TA, TeVPA Comparing Xmax Distribution with MC p/fe expectations: Hybrid TA data consistent with (QGSJET-II.3) protons
30 TA, TeVPA Photons and Neutrino Search TA Surface Detector Photon Search small a large a G. Rubtsov for the TA Collaboration ICRC py/access?contribid=149&sessionid=3 &resid=0&materialid=slides&confid=0 a = Linsley curvature parameter
31 TA, TeVPA TA Data TA Data TA Data γ MC γ MC γ MC arxiv: [astro-ph.he] Submitted to Phys Rev D
32 TA SD Neutrino Search Surface Detector Recorded Waveforms Neutrinos primaries produce YOUNG (many peaks in waveform) but HIGHLY INCLINED showers TA, TeVPA
33 TA PREIMINARY ICRC 2013 NO INCLINED YOUNG showers in TA data ZERO neutrino candidates TA, TeVPA
34 Equatorial Coordinates TA, TeVPA Anisotropy E>10 EeV 988 events E>40 EeV 57 events Search based on 3.3 year (May 2008-Sep 2011) data published: Astrophysical Journal, 757:26 (2012) zenith < 45 deg E>57 EeV 25 events Results were consistent with Isotropic Source Model
35 TA, TeVPA TA Anisotrpy Update full years of Data: May 2008 May 2013 Zenith < 55 deg Angular resolution better than 1.5 deg. E>10 EeV: 2130 events E>40 EeV: 132 events E>57 EeV: 52 events Energy resolution ~20% Results are still largely consistent with isotropy, but
36 E > 57 EeV, SuperGalactic coordinates Hot Spot? P. Tinyakov for the TA Collaboration ICRC dico/getfile.py/access?c ontribid=1033&sessionid =3&resId=0&materialId= slides&confid=0 K.S. p = 0.06 K.S. p = SuperGalactic Longitude (deg) SuperGalactic Latitude (deg) TA, TeVPA
37 P(δ) = Probability that the observed number of pairs (at <δ) occurs by chance from an isotropic distribution Clustering (autocorrelation) Small P(δ): Clustering at angular scale ~δ Separation angle P(δ)~0.004 at δ~20o for E > 57 EeV TA, TeVPA
38 TA, TeVPA Comparison with Large-Scale Structure (LSS) E > 10 EeV: 2130 events E > 40 EeV: 132 events E > 57 EeV: 52 events White dots: 5-year TA data with zenith angle < 55 deg. Gray patterns: expected flux density from proton LSS 2MASS Galaxy Redshift catalog (XSCz)
39 Comparison with Large-Scale Structure (LSS) E > 10 EeV E > 40 EeV E > 57 EeV Theta: deflection angle Need more data! TA, TeVPA
40 Conclusions TA Energy spectrum consistent with light composition ***TA surface scintillator array consistent with GZK cut-off Preliminary <Xmax> composition result from both stereo and hybrid analyses consistent with light (proton) composition No UHE photon or neutrino TA SD data largely consistent with isotropy Small Excess seen in SG Hint of Clustering at ~20 deg Marginally incompatible with isotropy at E>57 EeV but compatible with Large Scale Structure (LSS) TA Low Energy Extension (TALE) nearly completed Plans for TAx4 expansion TA, TeVPA
41 Correlations with AGN 472 AGN from 2006 Veron catalog with z < E > 57 EeV, zenith angle < 45o, N = 42 (5 yr) Separation angle = 3.1o TA, TeVPA
42 Correlations with AGN Probability to hit AGN with a single event po = events correlate out of 42 p = Astrophysical Journal, 757:26 (2012) TA, TeVPA
43 TA, TeVPA TA 4 Expansion A project to expand the TA surface detector by a factor of 4 (~3000 km2) 500 more scintillation counters with 2.08 km spacing A fluorescence detector of 10 telescopes from HiRes telescopes The proposal is being prepared for submission in fall, Anisotropy studies with more significance By March, TA years of SD data 14 TA years of hybrid data
44 TA, TeVPA
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