Monte Carlo Bayesian search for the plausible source of the Telescope Array hotspot

He, Hao-Ning; Kusenko, Alexander; Nagataki, Shigehiro; Zhang, Bin-Bin; Yang, R.; Fan, Yi‐Zhong

doi:10.1103/physrevd.93.043011

Cited by 48 publications

(42 citation statements)

References 60 publications

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“…The first 5 sources are the only radio galaxies satisfying the Hillas criterion for CR acceleration within z < 0.023, as determined assuming equipartition [25]. M82 was proposed as the origin of the TA hotspot [26] 6 and M87 is a long-discussed candidate whose direction is not represented by the others. • Second, we consider 14 source directions consisting of a uniform grid of 12 source directions defined from a low resolution HEALPix map as listed in Table 2, plus the north and south Galactic poles.…”

Section: Arrival Direction Distributions As a Function Of Source Dirementioning

confidence: 99%

Deflections of UHECRs in the Galactic magnetic field

Farrar

Sutherland

2019

J. Cosmol. Astropart. Phys.

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We report results of the first comprehensive, high resolution study of the deflections of UHECRs using a realistic model of the Galactic magnetic field and extending to sufficiently low rigidities, R ≡ E/Z ≥ 10 18 V, to describe Fe in the UHE energy range above ∼55 EeV, or the mixed composition reported by the Pierre Auger Collaboration at the energy of the observed dipole anisotropy. We use the Jansson-Farrar (JF12) model, which has both a large scale coherent and a structured random component, and determine deflections for fifteen rigidities from 10 18.0 to 10 20.0 V, for two different coherence length choices for the random component, L coh = 30 pc and 100 pc. We also check the sensitivity of UHECR deflections to the particular realization of the random field, for 3 rigidity values. For each rigidity and field model studied, the UHECR arrival direction distribution is determined for an arbitrary source direction, by inverting the trajectories of > 5 × 10 7 isotropically-distributed anti-CRs of the given rigidity, which we backtrack using the code CRT. We present skyplots and tables characterizing the arrival directions, for representative 1 o sources.Except at high rigidity, the pattern of multiple images is very complex and depends strongly on the coherence length and source direction. For almost all sources, average deflections grow rapidly as the rigidity falls below 10 EV and deflections commonly are greater than 90 • . Magnification and demagnification can be strong at almost all rigidities, and varies significantly with source direction. Much of the extragalactic celestial sphere, behind and south of the Galactic Center, cannot be seen in UHECRs below 10 EV. The pattern of deflections obtained with the coherent field alone can be significantly different than with the complete field model, even as regards the position of the centroid, for some source directions and rigidities. Multiple images, sometimes very widely separated, are common for small coherence length, especially for low rigidity.

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Section: Arrival Direction Distributions As a Function Of Source Dirementioning

confidence: 99%

Deflections of UHECRs in the Galactic magnetic field

Farrar

Sutherland

2019

J. Cosmol. Astropart. Phys.

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“…Such a spread is to be expected due to scattering in turbulent intergalactic magnetic fields (IGMFs) as the UHECRs propagate the 3.8 Mpc distance from M82, and there may be additional scattering (particularly for iron nuclei) from magnetic fields in the Milky Way. The rms deflection angle for a UHECR of charge Z is (He et al 2016),…”

Section: Time Scales and Energeticsmentioning

confidence: 99%

“…He et al (2016) tried to identify possible extragalactic sources for the hot spot, taking into account possible deflection of the UHECRs by Galactic and intergalactic magnetic fields. After accounting for random deflections by stochastic intergalactic magnetic fields (IGMFs), they drew a straight line through the images of the different rigidity bins of the events in the hotspot, expecting the source to lie along this line.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh-energy cosmic ray hotspots from tidal disruption events

Pfeffer¹,

Kovetz²,

Kamionkowski³

2016

Mon. Not. R. Astron. Soc.

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We consider the possibility that tidal disruption events (TDEs) caused by supermassive black holes (SMBHs) in nearby galaxies can account for the ultra-high-energy cosmic-ray (UHECR) hotspot reported recently by the Telescope Array (TA) and the warm spot by Pierre Auger Observatory (PAO). We describe the expected cosmic-ray signal from a TDE and derive the constraints set by the timescale for dispersion due to intergalactic magnetic fields and the accretion time of the SMBH. We find that TDEs in M82 can explain the hotspot detected by the TA regardless of whether the UHECRs are composed of protons or heavier nuclei. We then check for consistency of the hot and warm spots from M82 and Cen A with the full-sky isotropic signal from all SMBHs within the GZK radius. This analysis applies to any scenario in which the hot/warm spots are real and due to M82 and Cen A, regardless of whether TDEs are the source of UHECRs. We find that the isotropic flux implied by the luminosity density inferred from M82 and Cen A is bigger than that observed by roughly an order of magnitude, but we provide several possible explanations, including the possibility of a local overdensity and the possibility of intermediate-mass nuclei in UHECRs, to resolve the tension.

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“…The Hot Spot is usually considered as the product of a starburst galaxy M82 (see, i.e. He et al 2016), but correction of EHECR arrival directions from the Hot Spot taking into account the influence of the regular GMF, especially for intermediate and heavy nuclei (Fig. 5), weakens the Hot Spot-M82 correlation and strengthens the Hot Spot-jet correlation.…”

Section: Ehecrs From Virgo a Jet In Void And Jet Modelmentioning

confidence: 99%

Search for ultra high-energy cosmic rays from radiogalaxy Virgo A

Kobzar

Hnatyk

Marchenko

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Active galactic nuclei (AGNs) are considered to be one of the most appropriate sources of ultra high energy cosmic rays (UHECRs, E 10 18 eV). Radiogalaxy Virgo A (M87) in the centre of a cluster of galaxies Virgo Cluster (VC) can be a prominent source of UHECRs. We investigate the possible contribution of Virgo A and the VC to the flux of events with trans-GZK energies -extremely high energy cosmic rays (EHECRs) -from the recent Auger and Telescope Array (TA) data sets (E > 52 EeV and E > 57 EeV, respectively). We simulate EHECR propagation from Virgo A and the VC taking into account their deflections in galactic (GMF) and extragalactic (EGMF) magnetic fields and show that there is no excess of EHECR arrival directions from Virgo A/VC images at different EHECR rigidities. By means of event-by-event analysis we recover the extragalactic arrival directions of EHECR events detected by Auger and TA for the representative set of nuclei H(p), He, N, Si, Fe, and find evidences of enhanced fluxes of N-Si-Fe EHECRs from the Local Filament and Hot/Cold Spot regions. The Local Filament with its enhanced magnetic field is an expected contributor to the UHECR flux as the closest to Earth last scattering centre, whereas Hot/Cold Spot region is a part of a larger arc-like spot, possibly created by the diffusively spreading jet of UHECRs, accelerated in the relativistic jet of Virgo A during a prominent nuclear outburst about 10 -12 Myr ago.

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Monte Carlo Bayesian search for the plausible source of the Telescope Array hotspot

Cited by 48 publications

References 60 publications

Deflections of UHECRs in the Galactic magnetic field

Deflections of UHECRs in the Galactic magnetic field

Ultrahigh-energy cosmic ray hotspots from tidal disruption events

Search for ultra high-energy cosmic rays from radiogalaxy Virgo A

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