Binary neutron star merger remnants as sources of cosmic rays below the “Ankle”

Abstract We investigate non-thermal electron and nuclei energy losses within the binary neutron star merger remnant produced by the event GW170817. The lack of a cooling feature within the detected synchrotron emission from the source is used to constrain the magnetic field at the mG level, assuming that this emission is electron synchrotron in origin, and that the accelerated spectrum in the electrons follows the form d N / d E e ∝ E e − 2 . The level of subsequent gamma-ray emission from the source is demonstrated to provide a further constraint on the source magnetic field strength. We also put forward alternative strong ( ∼ G) magnetic field scenarios able to support this emission. For such stronger fields, the photo-disintegration of non-thermal nuclei within the source is considered, and a bottleneck period of  ∼ 5–30 days is found when this process peaks. We find that this class of source is in principle able to support the population of cosmic rays detected at Earth below the “ankle”.

[1]  K. Ioka,et al.  High-energy radiation from remnants of neutron star binary mergers , 2013, 1307.6805.

[2]  G. Burbidge.  Estimates of the Total Energy in Particles and Magnetic Field in the Non-Thermal Radio Sources. , 1959 .

[3]  A. Bell,et al.  Cosmic ray acceleration by relativistic shocks: Limits and estimates , 2017, 1709.07793.

[4]  Andrew J. Levan,et al.  The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave Event GW170817 , 2017, 1710.05856.

[5]  C. Guidorzi,et al.  The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. V. Rising X-Ray Emission from an Off-axis Jet , 2017, 1710.05431.

[6]  T. Hebbeker,et al.  Inferences on mass composition and tests of hadronic interactions from 0.3 to 100 EeV using the water-Cherenkov detectors of the Pierre Auger Observatory , 2017, 1710.07249.

[7]  F. Aharonian,et al.  Limitations on the photo-disintegration process as a source of VHE photons , 2010, 1005.3230.

[8]  V. Berezinsky,et al.  Ultra high energy cosmic rays: implications of Auger data for source spectra and chemical composition , 2013, 1312.7459.

[9]  M. S. Shahriar,et al.  Search for High-energy Neutrinos from Binary Neutron Star Merger GW170817 with ANTARES, IceCube, and the Pierre Auger Observatory , 2017, 1710.05839.

[10]  Saurabh W. Jha,et al.  The Discovery of the Electromagnetic Counterpart of GW170817: Kilonova AT 2017gfo/DLT17ck , 2017, 1710.05854.

[11]  M. V. Fernandes,et al.  TeV Gamma-Ray Observations of the Binary Neutron Star Merger GW170817 with H.E.S.S. , 2017, 1710.05862.

[12]  E. Ofek,et al.  Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star , 2017, Nature.

[13]  V. Tatischeff.  Radio emission and nonlinear diffusive shock acceleration of cosmic rays in the supernova SN 1993J , 2009, 0903.2944.

[14]  David Blair,et al.  Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A , 2017, 1710.05834.

[15]  D. Frail,et al.  A mildly relativistic wide-angle outflow in the neutron-star merger event GW170817 , 2017, Nature.

[16]  R. Gould,et al.  Pair production in photon-photon collisions. , 1967 .

[17]  M. Holler,et al.  Observations of the Crab Nebula with H.E.S.S , 2005 .

[18]  M. M. Kasliwal,et al.  A radio counterpart to a neutron star merger , 2017, Science.

[19]  C. Fransson,et al.  Modeling the Radio and X-ray Emission of SN 1993J and SN 2002ap , 2004, astro-ph/0404267.

[20]  T. Hebbeker,et al.  Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory , 2016 .

[21]  M. Kachelrieß,et al.  Cosmic ray anisotropy as signature for the transition from galactic to extragalactic cosmic rays , 2011, 1112.5599.

[22]  C. Guidorzi,et al.  The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. VI. Radio Constraints on a Relativistic Jet and Predictions for Late-time Emission from the Kilonova Ejecta , 2017, 1710.05457.

[23]  B. A. Boom,et al.  GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral. , 2017, Physical review letters.

[24]  Pierre Auger Collaboration.  Constraints on the origin of cosmic rays above $10^{18}$ eV from large scale anisotropy searches in data of the Pierre Auger Observatory , 2012, 1212.3083.

[25]  Juna A. Kollmeier,et al.  Evidence for Cocoon Emission from the Early Light Curve of SSS17a , 2017, 1710.05822.

[26]  A. Melandri,et al.  The evolution of the X-ray afterglow emission of GW 170817 / GRB 170817A in XMM-Newton observations , 2018, 1801.06164.

[27]  J. Prochaska,et al.  Swope Supernova Survey 2017a (SSS17a), the optical counterpart to a gravitational wave source , 2017, Science.

[28]  E. Parizot,et al.  UHECR acceleration at GRB internal shocks , 2014, 1409.1271.

[29]  M. Longair,et al.  High Energy Astrophysics: Volume 2, Stars, the Galaxy and the Interstellar Medium , 1994 .

[30]  T. Sakamoto,et al.  The X-ray counterpart to the gravitational-wave event GW170817 , 2017, Nature.

[31]  J. P. Osborne,et al.  The optical afterglow of the short gamma-ray burst associated with GW170817 , 2018, Nature Astronomy.

[32]  Todor Stanev,et al.  Cosmic ray energy spectrum from measurements of air showers , 2013, 1303.3565.

[33]  Shan Gao,et al.  Neutrinos and Ultra-high-energy Cosmic-ray Nuclei from Blazars , 2017, 1711.02091.

[34]  C. Guidorzi,et al.  The Binary Neutron Star Event LIGO/Virgo GW170817 160 Days after Merger: Synchrotron Emission across the Electromagnetic Spectrum , 2018, 1801.03531.

[35]  J. Ruan,et al.  Fading of the X-Ray Afterglow of Neutron Star Merger GW170817/GRB 170817A at 260 Days , 2018, The Astrophysical Journal.

[36]  Malcolm S. Longair,et al.  High energy astrophysics: The contents of the Universe – the grand design , 1981 .

[37]  B. Metzger,et al.  High-energy Neutrinos from Millisecond Magnetars Formed from the Merger of Binary Neutron Stars , 2017, 1707.04263.

[38]  Danna Zhou,et al.  d. , 1840, Microbial pathogenesis.

[39]  J. Beacom,et al.  Very-high-energy gamma-ray signal from nuclear photodisintegration as a probe of extragalactic sources of ultrahigh-energy nuclei , 2010, 1002.3980.

[40]  J. Ruan,et al.  Brightening X-Ray Emission from GW170817/GRB 170817A: Further Evidence for an Outflow , 2017, 1712.02809.

[41]  L. Anchordoqui,et al.  Origin of the ankle in the ultrahigh energy cosmic ray spectrum, and of the extragalactic protons below it , 2015, 1505.02153.

[42]  A. Fedynitch,et al.  Cosmic Ray and Neutrino Emission from Gamma-Ray Bursts with a Nuclear Cascade , 2017, 1705.08909.

[43]  E. Bozzo,et al.  INTEGRAL Detection of the First Prompt Gamma-Ray Signal Coincident with the Gravitational-wave Event GW170817 , 2017, 1710.05449.

[44]  C. Fransson,et al.  Radio Emission and Particle Acceleration in SN 1993J , 1998, astro-ph/9807030.

[45]  P. M'esz'aros,et al.  Super-knee Cosmic Rays from Galactic Neutron Star Merger Remnants , 2018, The Astrophysical Journal.

[46]  P. Cowperthwaite,et al.  Spitzer Space Telescope Infrared Observations of the Binary Neutron Star Merger GW170817 , 2018, The Astrophysical Journal.

[47]  P. G. Isar,et al.  Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande. , 2011, Physical review letters.

[48]  F. A. Aharonian.  TeV gamma rays from BL Lac Objects due to synchrotron radiation of extremely high energy protons , 2000 .

[49]  A. Bell.  Turbulent amplification of magnetic field and diffusive shock acceleration of cosmic rays , 2004 .

[50]  V. M. Lipunov,et al.  MASTER Optical Detection of the First LIGO/Virgo Neutron Star Binary Merger GW170817 , 2017, 1710.05461.

[51]  Kohta Murase,et al.  High-energy Neutrino Emission from Short Gamma-Ray Bursts: Prospects for Coincident Detection with Gravitational Waves , 2017, 1708.07075.

[52]  W. F. Ong,et al.  THE ELECTROMAGNETIC COUNTERPART OF THE BINARY NEUTRON STAR MERGER LIGO/VIRGO GW170817. I. DISCOVERY OF THE OPTICAL COUNTERPART USING THE DARK ENERGY CAMERA , 2017 .

[53]  A. R. Bazer-Bachi,et al.  Observations of the Crab Nebula with H.E.S.S , 2005, 1509.02902.

[54]  S. Fliescher,et al.  CONSTRAINTS ON THE ORIGIN OF COSMIC RAYS ABOVE 1018 eV FROM LARGE-SCALE ANISOTROPY SEARCHES IN DATA OF THE PIERRE AUGER OBSERVATORY , 2012 .