Searching for VHE gamma-ray emission associated with IceCube - - PowerPoint PPT Presentation
Searching for VHE gamma-ray emission associated with IceCube astrophysical neutrinos using FACT, H.E.S.S., MAGIC and VERITAS Marcos Santander*, Daniela Dorner, Jon Dumm, Konstancja Satalecka, Fabian Schssler for the VERITAS, FACT, IceCube,
Marcos Santander*, Daniela Dorner, Jon Dumm, Konstancja Satalecka, Fabian Schüssler for the VERITAS, FACT, IceCube, MAGIC, and H.E.S.S. Collaborations
*Barnard College - Columbia University
35th International Cosmic Ray Conference Busan, South Korea — July 12-20, 2017
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(oscillates to ~1:1:1)
Galactic B-field
Astrophysical beam dump
Spatial/Temporal correlations between neutrinos and gamma rays can trace cosmic-ray acceleration/interaction sites
IceCube Collab arxiv/1507.03991
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IceCube combined spectrum
Conventional atmospheric (νμ + νe)
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arxiv/1510.05223
4-year HE Starting Event (HESE) sky map
Search for VHE gamma-ray emission at the positions of likely-astrophysical neutrinos
For 6-year update see NU060 Sat 15th (Claudio Kopper)
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Khomas Highland (Namibia)
Canary Islands (Spain) Southern Arizona (USA)
resolution.
15°
“Cascade” events
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HESS-II
VERITAS MAGIC
HESS-I 5° 3.5° 3.2°
“Track” events
~1°
Moon
FACT 4.5°
CC νeντ interactions, NC any flavor CC νµ interactions
Only muon “track” events can be used in the follow-up observations given the IACTs’ field-of-view
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Visible to FACT/MAGIC/VERITAS Visible to H.E.S.S.
GC
Galactic Plane
Equatorial Coords
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ID RA Dec
H.E.S.S. obs. MAGIC obs. VERITAS obs. [] [] [] time [min] time [min] time [min] HESE-05 110.6
< 1.2 72
HESE-13 67.9 40.3 < 1.2
HESE-18 345.6
< 1.3 486
167.3 20.7 < 1.2
138 HESE-38 93.3 14.0 < 1.2
90 HESE-44 336.7 0.0 < 1.2 432
219.0
< 1.2 270
88.5 0.2 ∼ 1
HEMU2-03 37.1 18.6 ∼ 1
HEMU2-05 331.0 11.0 ∼ 1
HEMU2-06 346.8 24.0 ∼ 1
HEMU2-07 267.5 13.8 ∼ 1
HEMU2-08 238.3 18.9 ∼ 1
HEMU2-09 235.2 19.3 ∼ 1
HEMU2-11 323.3 2.8 ∼ 1
HEMU2-13 9.4 7.8 ∼ 1
HEMU2-14 207.2 6.7 ∼ 1
HEMU2-19 221.9 3.2 ∼ 1
HEMU2-20 138.9 47.6 ∼ 1
HEMU2-21 31.2 11.8 ∼ 1
HEMU6-20 169.61 28.04 < 0.5
HEMU6-27 110.63 11.42 < 0.3
110 HEMU6-28 100.48 4.56 < 0.3
Total exposure [hours] 21.0 24.0 31.0
No VHE gamma-ray excess found in the region of interest of the neutrino events
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0.1% of all-sky IceCube flux
3-year HESE arxiv/1405.5303
IceCube 7-year PS discovery potential arXiv/1609.04981
68% range Full range
ULs from H.E.S.S. and VERITAS
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much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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50% neutrino containment
1°
much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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50% neutrino containment
1°
much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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50% neutrino containment
1°
much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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50% neutrino containment
1°
much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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50% neutrino containment
1°
much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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IACT PSF
50% neutrino containment
1°
much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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IACT PSF
50% neutrino containment
1°
Upper-limit grid
much larger than the IACT PSF.
coverage of the 50% containment region of the neutrino events.
(95% CL) above an energy threshold for a E-2 spectrum on a regular grid.
gamma-ray excess or on potential nearby electromagnetic counterparts.
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HESE-5 0.2 < ETeV < 20 HESE-44 0.16 < ETeV < 8 HESE-37 ETeV > 0.12 HESE-38 ETeV > 0.12 HESE-13 ETeV > 0.16 HESE-37 ETeV > 0.16
H.E.S.S. MAGIC VERITAS
Flux upper limits in the range ~10-12 - 10-10 cm-2 s-1
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MAGIC VERITAS - ICRC 2017
50% 99%
(~ 8.7 PeV primary energy). patm < 0.01%.
the level of < 10-12 - 10-11 cm-2 s-1
HEMU6-27
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AMON GCN Circular
First HESE Alert (04/27/2016) Detection: 05:52:32 UT Alert sent: 05:53:53 UT Delay: 81 seconds
IceCube-160427A
VERITAS - ICRC2017
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4.2 hr obs, ~20 hr delay
GCN Cicular #19427 GCN Circular #19377
Other follow-ups: 160731A (Circ. #19377), 161103A, AMON160218 Other follow-ups: 161103A Other follow-ups: 160731A, ATel #9315
Poster GA071
Other follow-ups: 160731A (ATel #9301)
ray emission associated with IceCube high-energy neutrino events.
limit maps have been derived.
the sensitivity to transient or variable sources.
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