THE EHE EVENT AND PROSPECTS FROM THE ICECUBE NEUTRINO OBSERVATORY. Lu Lu 千葉大
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1 THE EHE EVENT AND PROSPECTS FROM THE ICECUBE NEUTRINO OBSERVATORY Lu Lu 千葉大
2 2
3 3
4 On-source n p TeV - PeV pp p n The Cosmic Neutrinos TeV->EeV p gp p n photopion production n GZK cosmogenic n EeV 100EeV CR CMB gcr p n 4
5 Neutrinos as smoking-gun for hadronic sources p g (p,n) p g-ray observations Cosmic Ray observations 2g m n e n n But ez egz eg eg n observations (Bremsstrahlung) (inverse Compton) could produce g-ray The smoking gun
6 6
7 movie 7
8 EVENT SIGNATURE 8
9 >99% detector uptime <0.05% sensor drop-out per year 9
10 LIVE MONITORING 10
11 ON-BOARD LEDS Position and timing calibrations 11
12 MOON SHADOW IC 59, 0.63 \pm 0.04 deg 12
13 DISCOVERY OF ASTROPHYSICAL NEUTRINO PeV neutrinos! 13
14 EVIDENCE OF ASTROPHYSICAL NEUTRINO C. Kopper 82 events in 6 years 14
15 EVIDENCE OF ASTROPHYSICAL NEUTRINO C. Haack ICRC
16 16
17 All-sky stacking Catalogue stacking Time integrated and dependent 17
18 No significant clustering ALL-SKY TIME-INTEGRATED POINT-SOURCE SEARCH 18
19 CORRELATIONS WITH BLAZARS 86% Fermi diffuse photons are from blazars highly variable EM emission IceCube time-integrated stacking analysis IceCube, ApJ vol. 835, no. 1, p. 45 (2017) 862 gamma-ray blazars with 3 years of IceCube neutrino data found that < 30% (6-27%) of the neutrino flux originates in blazars 19
20 Galactic plane IceCube, Astrophys.J. 849 (2017) 67 <16% of E -2.5 flux above 1 TeV Star-Forming Galaxies Gamma-Ray Bursts Bechtol K et al Astrophys. J % Fermi diffuse photons are from blazars Icecube, Astrophys.J. 824 (2016) no.2, 115 <30% (at 100 TeV) diffuse nu flux Short duration -> low background Applies to pp optical thin sources No neutrinos observed in coincidence with GRBs Prompt emission from GRBs can produce <1% of observed neutrino flux 20
21 Time-dependent analysis Transient alerts! 21
22 22
23 IceCube real-time stream veto-based HESE all neutrino flavor sensitive TeV PeV EeV High cosmic n purity samples. Launched in 2016! high chance of real cosmic neutrino signals angular resolutions so-so The breakthrough event detected in this channel EHE (Ultra-High Energies) TeV PeV EeV all neutrino flavor sensitive high chance of real cosmic neutrino signals good angular resolutions signal flux highly uncertain 23
24 Event selection for EHE alerts Atmospheric BG E -2 signal GZK n search Real time n GZK n search Real time n brighter accept accept dimmer reject reject Up-going down-going Up-going down-going 24
25 Effective area [arbitrary unit] EHE ALERT EVENT RATES Median 33 s N = T න dω න de ν φ ν E ν A ν E ν 25
26 ANGULAR RESOLUTION 26
27 A story about EHE alert IC170922A 27
28 ON A QUIET SATURDAY MORNING IN LATE SEPTEMBER :55 am, Saturday, September 23, JST 28
29 movie 29
30 IceCube A NPE 5,786 cos(zenith) right on the sweet spot signalness : 56.5 % Atmospheric BG E -2 signal GZK n search Real time n GZK n search Real time n 30
31 31
32 SPATIAL COINCIDENCE 3 FGL sources Historical EHE events 32
33 TIME COINCIDENCE Fermi All-sky Variability Analysis (FAVA) 7&flare=27 33
34 P-VALUE CALCULATION Testing nu->gamma correlations Is there a spatial-timing correlation between the EHE alert event with Fermi flare? H0: No spatial or time correlation between IceCube EHE alert event with Fermi 3FGL+3FHL catalogue Use Fermi light curves collected from the past 9 years Results soon to be published, now in iterations with reviewers 34
35 How often do we see a 3FGL source in the error window of EHE event P-VALUE CALCULATION example Hypo 1: n detection scales to variations in g flux of the source, regardless of g luminosity 35
36 How often do we see a 3FGL source in the error window of EHE event P-VALUE CALCULATION Hypo 1: n detection scales to variations in g flux of the source, regardless of g luminosity Hypo 2: n detection scales linearly to g energy flux. Brighter g source more likely 36
37 How often do we see a 3FGL source in the error window of EHE event P-VALUE CALCULATION Scales with variations of g flux of the source Or Scales with g energy flux, the brightness of the source Pseudo experiments Randomly sample time t (flat pdf) Randomly sample DEC according to event selection pdf Randomly sample RA Construct TS for H0 37
38 NEW ANALYSIS FOR PEV EVENT SEARCHES Contained cascades Partially-contained Through-going track IceCube Preliminary 38
39 NEW: A NEW 6 PEV NEUTRINO CANDIDATE Hadronic cascade with good angular resolution Highest deposit energy event Glashow candidate Stay tuned! 39
40 THE FUTURE: GEN2 In-ice upgrade: ~ 10,000 more optical sensors 5 10 km 3 instrumented volume ~ 120 strings Wish-list: sensors with directionality and more effective area smaller holes to reduce drilling cost a surface array for veto cosmic-ray background Challenges: -45ºC, 10,000 psi, logistics 40
41 DESIGNS FOR IN-ICE SENSORS More sparse string spacing sensors need to have larger effective area (Cherenkov UV photons) Benefits veto, event reconstruction For > PeV neutrinos we should have PMTs looking up since down-going is favoured due to earth absorption IceCube DOM mdom D-Egg WOM 35 cm 36 cm 30 cm 11 cm 41
42 D-EGG DETECTORS MAP OUT ICE D-Egg schematics Phase 1 IceCube upgrade: better systematics and improve angular resolution D-Egg prototypes 42
43 GEN2 POINT SOURCE SENSITIVITY Markarian Mpc δ= ~1e-12 43
44 WAY TO GO FOR UHECR SOURCES? Since Vela 4 satellite 1967 Since IceCube First detection of extensive air shower
45 THANK YOU VERY MUCH 45
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