Self-generated cosmic-ray turbulence can explain the morphology of TeV halos

  title={Self-generated cosmic-ray turbulence can explain the morphology of TeV halos},
  author={Payel Mukhopadhyay and Tim Linden},
  journal={Physical Review D},
Observations have shown that spatially extended “TeV halos” are a common (and potentially generic) feature surrounding young and middle-aged pulsars. However, their morphology is not understood. They are larger than the “compact” region where the stellar remnant dominates the properties of the interstellar medium, but smaller than expected in models of cosmic-ray diffusion through the standard interstellar medium. Several explanations have been proposed, but all have shortcomings. Here, we… 

Self-confinement of low-energy cosmic rays around supernova remnants

Supernova remnants have long been considered as a promising candidate for sources of Galactic cosmic rays. However, modelling cosmic-ray transport around these sources is complicated by the fact that

The Physics of Pulsar Halos: Research Progress and Prospect

  • Ruo-Yu Liu
  • Physics
    International Journal of Modern Physics A
  • 2022
Diffusive TeV gamma-ray emissions have been recently discovered extending beyond the pulsar wind nebulae of a few middle-aged pulsars, implying that energetic elec-tron/positron pairs are escaping

Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars

Pulsars have long been studied in the electromagnetic spectrum. Their environments are rich in high-energy cosmic-ray electrons and positrons likely enriching the interstellar medium with such

Snowmass2021 Cosmic Frontier White Paper: Puzzling Excesses in Dark Matter Searches and How to Resolve Them

Intriguing signals with excesses over expected backgrounds have been observed in many astrophysical and terrestrial settings, which could potentially have a dark matter origin. Astrophysical excesses

New estimate for the contribution of the Geminga pulsar to the positron excess

The origin of the positron excess is one of the most intriguing mysteries in astroparticle physics. The recent discovery of extended γ -ray halos around the pulsars Geminga, Monogem and PSR

Astrophysical and Cosmological Probes of Dark Matter

While astrophysical and cosmological probes provide a remarkably precise and consistent picture of the quantity and general properties of dark matter, its fundamental nature remains one of the most

Gamma-ray pulsar halos in the Galaxy

  • K. Fang
  • Physics
    Frontiers in Astronomy and Space Sciences
  • 2022
Pulsar halos are extended gamma-ray structures generated by electrons and positrons escaping from pulsar wind nebulae (PWNe), considered a new class of gamma-ray sources. They are ideal indicators



Diffuse gamma-ray emission from self-confined cosmic rays around Galactic sources

The propagation of particles accelerated at supernova remnant shocks and escaping the parent remnants is likely to proceed in a strongly non-linear regime, due to the efficient self-generation of

Propagation of galactic cosmic rays in the presence of self-generated turbulence

Cosmic rays propagating in the Galaxy may excite a streaming instability when their motion is super-alfvenic, thereby producing the conditions for their own diffusion. In this paper we present the

On the TeV Halo Fraction in gamma-ray bright Pulsar Wind Nebulae

The discovery of extended TeV emission around the Geminga and PSR B0656+14 pulsars, with properties consistent with free particlepropagation in the interstellar medium (ISM), has sparked considerable

Confinement of cosmic rays in molecular clouds

We explore the trapping of cosmic rays produced by a supernova in a dense molecular cloud and the implications for COS B ..gamma..-ray sources. After an extensive study of the Alfven wave streaming

Constraining the Magnetic Field in the TeV Halo of Geminga with X-Ray Observations

Recently, the High Altitude Water Cherenkov (HAWC) collaboration reported the discovery of a TeV halo around the Geminga pulsar. The TeV emission is believed to originate from the inverse Compton

Constraining the properties of the magnetic turbulence in the Geminga region using HAWC γ-ray data

Observations of extended gamma-ray emission around Galactic cosmic-ray (CR) sources can be used as novel probes of interstellar magnetic fields. Using very-high-energy gamma-ray data from the HAWC

Studying Galactic interstellar turbulence through fluctuations in synchrotron emission

The characteristic outer scale of turbulence and the ratio of the random to ordered components of the magnetic field are key parameters to characterise magnetic turbulence in the interstellar gas,

Cosmic-Ray Propagation in Light of the Recent Observation of Geminga

Two-zone diffusion models are proposed as a solution to this discrepancy, where the slower diffusion zone (SDZ) is confined to a small region around the PWN, and are shown to successfully reproduce the HAWC observations of the Geminga PWN while retaining consistency with other CR data.

Limits on diffusive shock acceleration in supernova remnants in the presence of cosmic-ray streaming instability and wave dissipation

The instability in the cosmic-ray precursor of a supernova shock moving in interstellar medium is studied. The level of magnetohydrodynamic turbulence in this region determines the maximum energy of

Two-zone Diffusion of Electrons and Positrons from Geminga Explains the Positron Anomaly

The recent HAWC observations of a very-high-energy γ-ray halo around Geminga and Monogem indicate a very slow diffusion of cosmic rays that results in a tiny contribution of positrons from these two