Astronomy with Ultra High‐Energy Particles

Hörandel, J. R.

doi:10.1002/9783527622993.ch9

Cited by 6 publications

(5 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This makes GRGs excellent 'calorimeters' for measuring the energy output of the central black holes (BH), because the giant radio lobes are believed to store most of the released energy of black holes for a very long time interval and may also reveal multiple radio episodes of black hole activity (Kronberg et al 2001). Moreover, because the extended lobes of GRGs can contain charged particles long enough for them to be accelerated to extremely high energies (Hillas 1984), it has been suggested (Kronberg 2004;Hardcastle et al 2009) that shocks within the energetic jets and radio lobes of GRGs can be the possible sites for the acceleration of ultra high energy cosmic rays (UHECRs) whose origin is still unknown and a subject of world-wide research (Hörandel 2008;Bauleo & Rodríguez Martino 2009;Hooper 2016).…”

Section: Introductionmentioning

confidence: 99%

Discovery of giant radio galaxies from NVSS: radio and infrared properties

Dabhade

Gaikwad

Bagchi

et al. 2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Giant radio galaxies (GRGs) are one of the largest astrophysical sources in the Universe with an overall projected linear size of ∼ 0.7 Mpc or more. Last six decades of radio astronomy research has led to the detection of thousands of radio galaxies. But only ∼ 300 of them can be classified as GRGs. The reasons behind their large size and rarity are unknown. We carried out a systematic search for these radio giants and found a large sample of GRGs. In this paper, we report the discovery of 25 GRGs from NVSS, in the redshift range (z) ∼ 0.07 to 0.67. Their physical sizes range from ∼ 0.8 Mpc to ∼ 4 Mpc. Eight of these GRGs have sizes 2 Mpc which is a rarity. Here, for the first time, we investigate the mid-IR properties of the optical hosts of the GRGs and classify them securely into various AGN types using the WISE mid-IR colours. Using radio and IR data, four of the hosts of GRGs were observed to be radio loud quasars that extend up to 2 Mpc in radio size. These GRGs missed detection in earlier searches possibly because of their highly diffuse nature, low surface brightness and lack of optical data. The new GRGs are a significant addition to the existing sample that will contribute to better understanding of the physical properties of radio giants.

show abstract

Section: Introductionmentioning

confidence: 99%

Discovery of giant radio galaxies from NVSS: radio and infrared properties

Dabhade

Gaikwad

Bagchi

et al. 2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…A simple estimate, taking into account the energy output of possible sources as, e.g., the kinetic energy in AGN jets hints towards a modest number of sources (order of 10 to 25) in order to sustain the power measured in extra-galactic cosmic rays [37].…”

Section: Theoretical Requirementsmentioning

confidence: 99%

GCOS -- The Global Cosmic Ray Observatory

Hörandel

2022

Preprint

Self Cite

View full text Add to dashboard Cite

Nature is providing particles with energies exceeding 100 EeV. Their existence imposes immediate questions: Are they ordinary particles, accelerated in extreme astrophysical environments, or are they annihilation or decay products of super-heavy dark matter or other exotic objects? If the particles are accelerated in extreme astrophysical environments, are their sources related to those of high-energy neutrinos, gamma rays, and/or gravitational waves, such as the recently observed mergers of compact objects? The particles can also be used to study physics processes at extreme energies; is Lorentz invariance still valid? Are the particles interacting according to the Standard Model or are there new physics processes? The particles can be used to study hadronic interactions (QCD) in the kinematic forward direction; what is the cross section of protons at center-of-mass energies √𝑠 > 100 TeV? These questions are addressed at present by installations like the Telescope Array and the Pierre Auger Observatory. After the year 2030, a next-generation observatory will be needed to study the physics and properties of the highest-energy particles in Nature, building on the knowledge harvested from the existing observatories. It should have an aperture at least an order of magnitude bigger than the existing observatories. Recently, more than 200 scientists from around the world came together to discuss the future of the field of multi-messenger astroparticle physics beyond the year 2030. Ideas have been discussed towards the physics case and possible scenarios for detection concepts of the Global Cosmic Ray Observatory -GCOS. A synopsis of the key results discussed during the brainstorming workshop will be presented.

show abstract

“…Jörg R. Hörandel A simple estimate, taking into account the energy output of possible sources as, e.g., the kinetic energy in AGN jets hints towards a modest number of sources (order of 10 to 25) in order to sustain the power measured in extra-galactic cosmic rays [37].…”

Section: Gcos -The Global Cosmic Ray Observatorymentioning

confidence: 99%

GCOS - The Global Cosmic Ray Observatory

Hörandel¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

Self Cite

View full text Add to dashboard Cite

Nature is providing particles with energies exceeding 100 EeV. Their existence imposes immediate questions: Are they ordinary particles, accelerated in extreme astrophysical environments, or are they annihilation or decay products of super-heavy dark matter or other exotic objects? If the particles are accelerated in extreme astrophysical environments, are their sources related to those of high-energy neutrinos, gamma rays, and/or gravitational waves, such as the recently observed mergers of compact objects? The particles can also be used to study physics processes at extreme energies; is Lorentz invariance still valid? Are the particles interacting according to the Standard Model or are there new physics processes? The particles can be used to study hadronic interactions (QCD) in the kinematic forward direction; what is the cross section of protons at center-of-mass energies √ > 100 TeV? These questions are addressed at present by installations like the Telescope Array and the Pierre Auger Observatory. After the year 2030, a next-generation observatory will be needed to study the physics and properties of the highest-energy particles in Nature, building on the knowledge harvested from the existing observatories. It should have an aperture at least an order of magnitude bigger than the existing observatories. Recently, more than 200 scientists from around the world came together to discuss the future of the field of multi-messenger astroparticle physics beyond the year 2030. Ideas have been discussed towards the physics case and possible scenarios for detection concepts of the Global Cosmic Ray Observatory -GCOS. A synopsis of the key results discussed during the brainstorming workshop will be presented.

show abstract

Astronomy with Ultra High‐Energy Particles

Cited by 6 publications

References 105 publications

Discovery of giant radio galaxies from NVSS: radio and infrared properties

Discovery of giant radio galaxies from NVSS: radio and infrared properties

GCOS -- The Global Cosmic Ray Observatory

GCOS - The Global Cosmic Ray Observatory

Contact Info

Product

Resources

About