2023
Session: Multi-Messenger 2. Cosmic Rays and Gamma Rays
June 14
Title: The highest energy cosmic rays (a review)
Speaker: Glennys Farrar (New York University)
Presentation: PDF File
Video: YouTube
May 31
Title: Mirror diffusion of cosmic rays in MHD turbulence
Speaker: Siyao Xu (IAS, Princeton)
Presentation: PDF File
Video: YouTube
Readings:
- Diffusion of Cosmic Rays in MHD Turbulence with Magnetic Mirrors
- Mirror Diffusion of Cosmic Rays in Highly Compressible Turbulence Near Supernova Remnants
- Turbulent Reconnection Acceleration
- Shock Acceleration with Oblique and Turbulent Magnetic Fields
May 17
Title: From Turbulence to Reconnection to Particle Acceleration: Connecting the Dots
Speaker: Luca Comisso (Columbia University)
Presentation: PDF File
Video: YouTube
Readings:
- Ion and Electron Acceleration in Fully Kinetic Plasma Turbulence
- Pitch Angle Anisotropy Controls Particle Acceleration and Cooling in Radiative Relativistic Plasma Turbulence
- Hard Synchrotron Spectra from Magnetically Dominated Plasma Turbulence
- The Interplay of Magnetically Dominated Turbulence and Magnetic Reconnection in Producing Nonthermal Particles
- Particle Acceleration in Relativistic Plasma Turbulence
May 3
Title: High-Energy View with NuSTAR
Speaker: Kaya Mori (Columbia University)
Presentation: PDF File
Video: YouTube
Readings:
- Mori et al. 2015 (Galactic Center)
- Grefenstette et al. 2015 (Cas A hard X-ray emission)
- Harrison et al. 2013 (NuSTAR mission)
April 19
Title: ALMA CO Observations of shocked filaments in young SNR shells
Speaker: Hidetoshi Sano (Space Science Laboratory, Gifu University)
Presentation: PDF File
Video: YouTube
Readings:
- ALMA CO Observations of the Gamma-Ray Supernova Remnant RX J1713.7-3946: Discovery of Shocked Molecular Cloudlets and Filaments at 0.01 pc Scales
- The interstellar medium in young supernova remnants: key to the production of cosmic X-rays and γ -rays
April 5
Title: Cosmic Rays in Galaxy Formation – a Summary
Speaker: Ellen Zweibel (University of Wisconsin, Madison)
Presentation: PDF File
Video: YouTube
Readings:
- The Basis for Cosmic Ray Feedback: Written on the Wind
- Cosmic Ray Transport, Energy Loss, and Influence in the Multiphase Interstellar Medium
March 22
Title: On the Origin of the Giant Gamma-ray Halo of M31
Speaker: Sarah Recchia (University of Turin)
Presentation: PDF File
Video: YouTube
Readings:
- Giant Cosmic-Ray Halos around M31 and the Milky Way
- Fermi-LAT Observations of γ-Ray Emission toward the Outer Halo of M31
- Galactic halo origin of the neutrinos detected by IceCube
- Fluxes of diffuse gamma rays and neutrinos from cosmic-ray interactions with the circumgalactic gas
- Ultra high energy cosmic rays from past activity of Andromeda galaxy
March 8
Title: Pulsar Gamma-ray Halos
Speaker: Ruoyu Liu (School of Astronomy and Space Sciences, Nanjing University)
Presentation: PDF File
Video: YouTube
Readings:
February 22
Title: The Recurrent Nova RS Ophiuchi, and the Galactic CR Connection
Speaker: Brian Revile (Max-Planck-Institut für Kernphysik, Heidelberg)
Presentation: PDF File
Video: YouTube
Readings:
- Time-resolved hadronic particle acceleration in the recurrent nova RS Ophiuchi
- Cosmic-ray acceleration and escape from supernova remnants
- Can superbubbles accelerate ultrahigh energy protons?
February 8
Title: Particle Acceleration in Shearing Flows
Speaker: Frank Rieger (ITP Heidelberg University)
Presentation: PDF File
Video: YouTube
Readings:
- Active Galactic Nuclei as Potential Sources of Ultra-High Energy Cosmic Rays
- An Introduction to Particle Acceleration in Shearing Flows
- Radio Galaxies at VHE energies, together with A. Levinson
- Particle acceleration in shearing flows: the case for large-scale jets
- Particle Acceleration in Shearing Flows: Efficiencies and Limits
- Generalized Fermi Acceleration
2022
December 14
Title: Exciting IceCube Results – A recap of the 3 November 2022 IceCube Webinar
Speakers: Elisa Resconi (Technical University of Munich) and Hans Niederhausen (Michigan State University), with theoretical discussions with Felix Aharonian (DIAS), Paolo Coppi (Yale University), and Kohta Muras (Penn State)
November 30
Title: Gravitational Waves and Multi-Wavelength Emissions
Speaker: Marica Branchesi (Gran Sasso Science Institute)
Video: YouTube
Readings:
- GeV emission from a compact binary merger
- Perspectives for multimessenger astronomy with the next generation of gravitational-wave detectors and high-energy satellites
- Science case for the Einstein telescope
November 9
Title: Radio Detection of UHE Neutrinos (at Multi-PeV Energies and Above)
Speaker: Anna Nelles (Erlangen)
Presentation: PDF File
Video: YouTube
Readings:
- Introductory Review
- Signal generation
- Experiments
October 19
Title: High Energy Neutrinos: Connections with Gamma-Ray Sources and Multi-Messenger Astronomy
Speaker: Francis Halzen (University of Wisconsin, Madison)
Presentation: PDF File
Video: YouTube
Readings:
- Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
- First Observation of PeV-energy Neutrinos with IceCube
October 5
Title: How to Search for Multiple Messengers—A General Framework Beyond Two Messengers
Speaker: Zsuzsa Marka (Columbia University)
Presentation: PDF File
Video: YouTube
Readings:
- https://journals.aps.org/prd/abstract/10.1103/PhysRevD.100.08301
- How to Search for Multiple Messengers—A General Framework Beyond Two Messengers
- IceCube search for neutrinos coincident with gravitational wave events from LIGO/Virgo run O3
September 21
Title: Supernova Remnants as Cosmic Ray Accelerators: from the Milky Way to Starburst Galaxies
Speaker: Giovanni Morlino (INAF)
Presentation: PDF File
Video: YouTube
Readings:
- Contribution of starburst nuclei to diffuse gamma-ray and neutrino flux
- Cosmic ray transport and radiative processes in nuceli of starburst Galaxies
June 15
Title: Radiation Mechanism of FRBs
Speaker: Yuri Lyubarsky (Ben-Gurion University)
Presentation: PDF File
Video: YouTube
Readings:
June 1
Title: Magnetic Reconnection and Astrophysical Implications
Speaker: Lorenzo Sironi (Columbia University)
Presentation: PDF File
Video: YouTube
Readings:
- Relativistic Magnetic Reconnection in Pair Plasmas and Its Astrophysical Applications
- Comptonization by Reconnection Plasmoids in Black Hole Coronae II: Electron-Ion Plasma
- Reconnection-driven Particle Acceleration in Relativistic Shear Flows
- A fully kinetic model for orphan gamma-ray flares in blazars
May 18
Title: Probing Extragalactic Magnetic and Radiation Fields with Gamma Rays
Speaker: Jonathan Biteau (Université Paris-Sud 11)
Presentation: PDF File
Video: YouTube
Readings:
- Measuring energy production in the Universe over all wavelengths and all time, S. Driver, IAU Symposium 355 (2021)
- The Gamma-Ray Window to Intergalactic Magnetism, R. Alves Batista & A. Saveliev, Universe (2021)
- Cosmology with Very-High-Energy Gamma Rays, E. Pueschel & J. Biteau, World Scientific (2022)
- Gamma-ray Cosmology and Tests of Fundamental Physics, J. Biteau & M. Meyer, Galaxies (2022)
- Anomalous Flux in the Cosmic Optical Background Detected with New Horizons Observations, T. R. Lauer, M. Postman, J. R. Spencer et al., ApJL (2022)
May 4
Title: AGN jets (and magnetosphere) and the consequences for high energy emission
Speaker: Amir Levinson (Tel Aviv University)
Presentation: PDF File
Video: YouTube
April 20
Title: High Energy Processes in AGN
Speaker: Paolo Coppi (Yale University)
Presentation: PDF File
Video: YouTube
April 6
Title: Blazars as Gamma-Ray Emitters
Speaker: Luigi Costamante (ASI – Italian Space Agency)
Presentation: PDF File
Video: YouTube
Readings:
- Egret blazars and Fermi update 20 years later:
- Blazar sequence (last update):
- Its main criticism :
- Fermi data check on External Compton (BLR) scenario
- Extreme gamma-ray BLLacs:
- Peculiar X-ray – TeV connections:
- Fastest TeV variability observed in blazars
- and main implications:
March 23
Title: Theory and Phenomenology of PeVatrons
Speaker: Stefano Gabici (APC)
Presentation: PDF File
Video: YouTube
Readings:
- Probably the earliest recognition of the problem of PeV particle acceleration: https://ui.adsabs.harvard.edu/abs/1983A%26A…125..249L/abstract
- Radiative signatures of pevatrons: https://ui.adsabs.harvard.edu/abs/2007ApJ…665L.131G/abstract
- Two papers by Bell and collaborators: https://ui.adsabs.harvard.edu/abs/2013MNRAS.431..415B/abstracthttps://ui.adsabs.harvard.edu/abs/2013MNRAS.435.1174S/abstract
- A recent review on PeVatrons: https://ui.adsabs.harvard.edu/abs/2021Univ….7..324C/abstract
- Chapter 5.7 in “Very High Energy Cosmic Gamma Radiation” (F. Aharonian)
March 9
Title: PeVatrons – Detection Techniques and Observations
Speaker: Jim Hinton (Max-Planck-Institut für Kernphysik)
Presentation: PDF File
Video: YouTube
February 23
This talk has unfortunately been cancelled due to unforeseen circumstances.
Title: The VERITAS View of the Galactic Gamma-ray Sky
Speaker: Jamie Holder (University of Delaware)
Readings:
- Latest results from VERITAS: Gamma 2016
- A Very High Energy γ-Ray Survey toward the Cygnus Region of the Galaxy (Detailed description of the Cygnus survey)
- Periastron Observations of TeV Gamma-Ray Emission from a Binary System with a 50-year Period (PSR J2032)
- Evidence for Proton Acceleration up to TeV Energies Based on VERITAS and Fermi-LAT Observations of the Cas A SNR (Cas A)
- VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog (VERITAS & HAWC)
- Gamma-Ray Observations of Tycho’s Supernova Remnant with VERITAS and Fermi (Tycho)
- Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar (Crab Pulsar)
- Detection of Extended VHE Gamma Ray Emission from G106.3+2.7 with Veritas (G106.3+2.7)
- The first VERITAS telescope (VERITAS Telescope description)
February 9
Title: The Crab Pulsar Wind Nebula
Speaker: Elena Amato (INAF)
Presentation: PDF File
Video: YouTube
Readings:
- The Crab Pulsar and Nebula as Seen in Gamma-Rays
- LHAASO paper on PeV emission from Crab
- Historical/seminal paper by Rees and Gunn (1974)
January 26
Title: Surveying the TeV Gamma-Ray Sky with the HAWC Wide-Field Observatory
Speaker: Petra Huentemeyer (Michigan Technological University)
Presentation: PDF File
Video: YouTube
Readings:
- Surveys
- Galactic Accelerators and their Environments
- HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon
- Evidence of 200 TeV Photons from HAWC J1825-134
- HAWC J2227+610 and Its Association with G106.3+2.7, a New Potential Galactic PeVatron
- Spectrum and Morphology of the Very-High-Energy Source HAWC J2019+368
- Evidence that Ultra-high-energy Gamma Rays Are a Universal Feature near Powerful Pulsars
- Cosmic-Ray Sea
- Fundamental Physics
- Future Instruments
January 12
Title: Gamma-ray binaries hosting a pulsar: prospects at the highest energies
Speaker: Valenti Bosch-Ramon (Universitat de Barcelona)
Presentation: PDF File
Video: YouTube
Readings:
- TeV light curve of PSR B1259-63/SS2883 (modeling)
- On the formation of TeV radiation in LS 5039 (modeling; discussion on the highest energies)
- The modulation of the gamma-ray emission from the binary LS 5039 (modeling)
- Exploring Particle Acceleration in Gamma-Ray Binaries (particle acceleration)
- A model for gamma-ray binaries, based on the effect of pair production feedback in shocked pulsar winds (particle acceleration)
- VHE observations of the gamma-ray binary system LS 5039 with H.E.S.S (observations LS 5039)
- Orbital evolution of colliding star and pulsar winds in 2D and 3D: effects of dimensionality, EoS, resolution, and grid size (simulations)
- Discovery of variable VHE γ-ray emission from the binary system 1FGL J1018.6-5856 (observations 1FGL J1018.6-5856)
- H.E.S.S. II observations of the 2014 periastron passage of PSR B1259-63/LS 2883 (observations PSR B1259-63)
2021
December 15
Title: Modeling of Galactic Pevatrons
Speaker: Andrei Bykov (Ioffe Institute)
Presentation: PDF File
Video: YouTube
Readings:
- PeV Photon and Neutrino Flares from Galactic Gamma-Ray Binaries
- High-Energy Particles and Radiation in Star-Forming Regions
- Ultrahard spectra of PeV neutrinos from supernovae in compact star clusters
- Nonthermal particles and photons in starburst regions and superbubbles
- Particle Acceleration in Relativistic Outflows
November 24
Title: Recent results from H.E.S.S. observations of the Galactic Plane
Speaker: Emma de Oña (DESY, Zeuthen)
Presentation: PDF File
Video: YouTube
Readings:
- The H.E.S.S. Galactic Plane Survey
- The population of TeV pulsar wind nebulae in the H.E.S.S. Galactic Plane Survey
- Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S.
November 10
Title: Discovery of Ultra High Energy Gamma-ray Sources by LHAASO
Speaker: Ruizhi Yang (University of Science and Technology of China)
Presentation: PDF File
Video: YouTube
Readings:
- Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622+3749 Observed by LHAASO-KM2A
- Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV
- Discovery of the Ultra-high energy gamma-ray source LHAASO J2108+5157
- Design of the LHAASO detectors
- Peta–electron volt gamma-ray emission from the Crab Nebula
- Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 γ-ray Galactic sources
October 27
Title: The multi-messenger signatures of neutron star mergers
Speaker: Brian Metzger (Columbia University)
Presentation: PDF File
Video: YouTube
Readings:
October 13
Title: Particle Acceleration in GRBs
Speaker: Andrei Beloborodov (Columbia University)
Presentation: PDF File
Video: YouTube
September 29
Title: GRBs and the Highest Energy Cosmic Rays
Speaker: Eli Waxman (Weizmann Institute of Science)
Presentation: PDF File
Video: YouTube
Readings:
- Cosmological Gamma-Ray Bursts and the Highest Energy Cosmic Rays
- Low-luminosity gamma-ray bursts as the sources of ultrahigh-energy cosmic ray nuclei
September 15
Title: Experimental/Theory: TeV GRB afterglows
Speaker: Dmitry Khangulyan (Rikkyo University)
Presentation: PDF File
Video: YouTube
Readings:
September 1
Title: Multi Messenger emission from GRBs
Speaker: Tsvi Piran (Racah Institute for physics, The Hebrew University of Jerusalem)
Presentation: PDF File
Video: YouTube
Readings:
July 28
Title: Relativistic shocks: uniting particle acceleration with radiation
Speaker: Evgeny Derishev (Institute of Applied Physics, Russian Academy of Sciences)
Presentation: PDF File
Video: YouTube
Readings:
- Particle acceleration, magnetization, and radiation in relativistic shocks
- A nice review on microphysics of collisionless relativistic shocks
- Converter acceleration mechanism, that is specific to relativistic shocks
- A particular realization of converer acceleration, which is consistent with synchrotron-self-Compton radiation from the downstream
July 14
Title: Accelerating UHECRs in Radio Galaxies (Rescheduled from June 16)
Speaker: Tony Bell (University of Oxford)
Presentation: PDF file
Discussions: Lead by Paolo Coppi & Felix Aharonian
Readings:
- A nice review: Particle acceleration in astrophysical jets
- Ultra-high energy cosmic rays from shocks in the lobes of powerful radio galaxies
- Fornax A, Centaurus A and other radio galaxies as sources of ultra-high energy cosmic rays
June 30
Title: Relativistic Fermi acceleration
Speaker: Martin Lemoine (Institut d’Astrophysique de Paris, CNRS)
Presentation: PDF file
Video: YouTube
Discussions: Lead by Martin Lemoine & Felix Aharonian
Readings:
- An Introduction to Particle Acceleration in Shearing Flows by F. Rieger
- Power law spectra from stochastic acceleration
- Generalized Fermi acceleration
June 16
Title: Accelerating UHECRs in Radio Galaxies (Rescheduled to 14 July)
Speaker: Tony Bell (University of Oxford)
Readings:
- A nice review: Particle acceleration in astrophysical jets
- Ultra-high energy cosmic rays from shocks in the lobes of powerful radio galaxies
- Fornax A, Centaurus A and other radio galaxies as sources of ultra-high energy cosmic rays
Title: Particle Acceleration in Variable Jets
Speaker: Andrew Taylor (DESY)
Presentation: PDF file
Readings:
Discussions: Lead by Paolo Coppi & Felix Aharonian
June 2
Title: Extreme Particle Accelerators (Introductory)
Aim: Highlight and discuss several key topics and identify potential talks.
Speaker: Felix Aharonian (DIAS/MPIK)
Presentation: PDF file
Discussions: Lead by Felix Aharonian
Readings:
- Constraints on the extremely high-energy cosmic ray accelerators from classical electrodynamics
- Scenarios for Ultrafast Gamma-Ray Variability in AGN
- Massive stars as major factories of Galactic cosmic rays
May 19
Title: Organization and Goals. Selection of topics.
(Initial organizational meeting)