Probing the Cosmic Ray Population of the Giant Elliptical Galaxy M 87 with Observed TeV Gamma-Rays

@article{Pfrommer2003ProbingTC,
  title={Probing the Cosmic Ray Population of the Giant Elliptical Galaxy M 87 with Observed TeV Gamma-Rays},
  author={Christoph Pfrommer and Torsten A. Ensslin},
  journal={Astronomy and Astrophysics},
  year={2003},
  volume={407}
}
We examine the cosmic ray proton (CRp) population within the giant elliptical galaxy M 87 using the TeV γ-ray detection of the HEGRA collaboration. In our scenario the γ-rays are produced by decaying pious which result from hadronic CRp interactions with thermal gas of the interstellar medium of M 87. By comparing the γ-ray emission to upper limits from EGRET, we constrain the spectral index of the CRp population to α T e V GeV < 2.275 within our scenario. Both the expected radial γ-ray profile… 
Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters
Current theories predict relativistic hadronic particle populations in clusters of galaxies in addition to the already observed relativistic leptons. In these scenarios hadronic interactions give
Constraining cosmic rays and magnetic fields in the Perseus galaxy cluster with TeV observations by the MAGIC telescopes
Galaxy clusters are being assembled today in the most energetic phase of hierarchical structure formation which manifests itself in powerful shocks that contribute to a substantial energy density of
Simulating cosmic rays in clusters of galaxies – III. Non-thermal scaling relations and comparison to observations
Complementary views of galaxy clusters in the radio synchrotron, hard X-ray inverse Compton and high-energy γ-ray regimes are critical in calibrating them as high-precision cosmological probes. We
THE QUEST FOR COSMIC RAY PROTONS IN GALAXY CLUSTERS
There have been many speculations about the presence of cosmic ray protons (CRps) in galaxy clusters over the past two decades. However, no direct evidence such as the characteristic -ray signature
MAGIC GAMMA-RAY TELESCOPE OBSERVATION OF THE PERSEUS CLUSTER OF GALAXIES : IMPLICATIONS FOR COSMIC RAYS, DARK MATTER, AND NGC 1275
The Perseus galaxy cluster was observed by the MAGIC Cherenkov telescope for a total effective time of 24.4 hr during 2008 November and December. The resulting upper limits on the gamma-ray emission
Deep observation of the NGC 1275 region with MAGIC: search of diffuse γ-ray emission from cosmic rays in the Perseus cluster
Clusters of galaxies are expected to be reservoirs of cosmic rays (CRs) that should produce diffuse gamma-ray emission due to their hadronic interactions with the intra-cluster medium. The nearby
Simulating cosmic rays in clusters of galaxies – II. A unified scheme for radio haloes and relics with predictions of the γ-ray emission
The thermal plasma of galaxy clusters lost most of its information on how structure formation proceeded as a result of dissipative processes. In contrast , non-equilibrium distributions of cosmic
M 87 — TEN YEARS OF TEV GAMMA-RAY OBSERVATIONS
The giant radio galaxy M 87 is located 16.7 Mpc away and harbours a supermassive black hole in its center. Structures of its relativistic plasma jet are resolved at radio, optical and X–ray energies.
DIFFUSE PIONIC GAMMA-RAY EMISSION FROM LARGE-SCALE STRUCTURES IN THE FERMI ERA
For more than a decade now, the complete origin of the diffuse gamma-ray emission background (EGRB) has been unknown. Major components like unresolved star-forming galaxies (making ≲ 50% of the EGRB)
Complex gamma-ray behavior of the radio galaxy M 87
Context. In recent years, non-blazar active galactic nuclei (AGN) such as radio galaxies have emerged as a highly instructive source class providing unique insights into high energy acceleration and
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 14 REFERENCES
Is the Giant Radio Galaxy M 87 a TeV Gamma-Ray Emitter?
For the first time an excess of photons above an energy threshold of 730 GeV from the giant radio galaxy M 87 has been measured at a significance level above 4 σ. The data have been taken during the
Egret upper limits on the high-energy gamma-ray emission of galaxy clusters
We report EGRET upper limits on the high-energy gamma-ray emission from clusters of galaxies. EGRET observations between 1991 and 2000 were analyzed at positions of 58 individual clusters from a
Galactic effects of the cosmic-ray gas
On an astronomical scale cosmic rays must be considered a tenuous and extremely hot (relativistic) gas. The pressure of the cosmic-ray gas is comparable to the other gas and field pressures in
On the escape of cosmic rays from radio galaxy cocoons
The escape rate of cosmic ray (CR) particles from radio galaxy cocoons is a problem of high astrophysical relevance: e.g. if CR electrons are stored for long times in the dilute relativistic medium
The nonthermal energy content and gamma ray emission of starburst galaxies and clusters of galaxies
The nonthermal particle production in contemporary starburst galaxies and in galaxy clusters is estimated from the Supernova rate, the iron content, and an evaluation of the dynamical processes which
The Structure of the Virgo Cluster from Surface Brightness Fluctuations in Hubble Space Telescope Images
Surface brightness fluctuations (SBF) in Hubble Space Telescope (HST) Wide Field Planetary Camera 2 images of elliptical galaxies provide the precision necessary to examine the internal structure of
Detection of neutralino annihilation photons from external galaxies
We consider neutralino annihilation in dense extragalactic systems known to be dominated by dark matter, in particular M87 and several local dwarf spheroidal galaxies. These annihilations can produce
Evolution of buoyant bubbles in M87
The morphology of the X-ray- and radio-emitting features in the central ~50 kpc region around the galaxy M87 strongly suggests that buoyant bubbles of cosmic rays (inflated by an earlier nuclear
XMM-Newton observation of M 87 - I. Single-phase temperature structure of intracluster medium
We report the results of a detailed analysis of the temperature structure of the X-ray emitting plasma halo of M 87, the cD galaxy of the Virgo Cluster. Using the MEKAL model, the data provide strong
Nonthermal Compton and Synchrotron Processes in the Jets of Active Galactic Nuclei
We present the basic equations for calculating the time-dependent received spectral flux from the optically thin emissivities produced by temporally evolving, nonthermal electrons losing energy in a
...
1
2
...