Publications (33)
On the Cluster Physics of Sunyaev-Zel'dovich Surveys II: Deconstructing the Thermal SZ Power Spectrum
N. Battaglia, J. R. Bond, C. Pfrommer +1
Secondary anisotropies in the cosmic microwave background are a treasure-trove of cosmological information. Interpreting current experiments probing them are limited by theoretical…
MAGIC Gamma-ray Telescope Observation of the Perseus Cluster of Galaxies: implications for cosmic rays, dark matter, and NGC1275
The MAGIC Collaboration, J. AleksiÄ, L. A. Antonelli +152
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…
Galactic winds driven by cosmic-ray streaming
M. Uhlig, C. Pfrommer, M. Sharma +3
Galactic winds are observed in many spiral galaxies with sizes from dwarfs up to the Milky Way, and they sometimes carry a mass in excess of that of newly formed stars by up to a f…
On the Cluster Physics of Sunyaev-Zel'dovich and X-ray Surveys IV: Characterizing Density and Pressure Clumping due to Infalling Substructures
N. Battaglia, J. R. Bond, C. Pfrommer +1
Understanding the outskirts of galaxy clusters at the virial radius (R200) and beyond is critical for an accurate determination of cluster masses and to ensure unbiased cosmologica…
Observation of the Perseus galaxy cluster with the MAGIC telescopes
S. Lombardi, F. Zandanel, P. Colin +5
The MAGIC ground-based Imaging Cherenkov experiment observed the Perseus galaxy cluster for a total of about 25 hr between November and December 2008 in single telescope mode and f…
Relighting the fire in Hickson Compact Group (HCG) 15: magnetised fossil plasma revealed by the SKA Pathfinders & Precursors
C. J. Riseley, T. Vernstrom, L. Lovisari +26
In the context of the life cycle and evolution of active galactic nuclei (AGN), the environment plays an important role. In particular, the over-dense environments of galaxy groups…
EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade
R. Alves Batista, M. A. Amin, G. Barenboim +134
Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the…
The effect of cosmic-ray acceleration on supernova blast wave dynamics
M. Pais, C. Pfrommer, K. Ehlert +1
Non-relativistic shocks accelerate ions to highly relativistic energies provided that the orientation of the magnetic field is closely aligned with the shock normal (quasi-parallel…
MERGHERS Pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev-Zel'dovich-selected galaxy clusters from ACT
K. Knowles, D. S. Pillay, S. Amodeo +26
The MeerKAT Exploration of Relics, Giant Halos, and Extragalactic Radio Sources (MERGHERS) survey is a planned project to study a large statistical sample of galaxy clusters with t…
Deep observation of the NGC 1275 region with MAGIC: search of diffuse gamma-ray emission from cosmic rays in the Perseus cluster
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +154
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 med…
Dark Matter decay and annihilation in the Local Universe: CLUES from Fermi
A. J. Cuesta, T. E. Jeltema, F. Zandanel +9
We present all-sky simulated Fermi maps of gamma-rays from dark matter decay and annihilation in the Local Universe. The dark matter distribution is obtained from a constrained cos…
Introduction to extragalactic sources of very high-energy photons
C. Pfrommer
The launch of the Fermi gamma-ray space telescope and the imaging air Cerenkov telescopes H.E.S.S., MAGIC, and VERITAS have substantially transformed our knowledge of gamma-ray sou…
Clusters and Large-Scale Structure: the Synchrotron Keys
L. Rudnick, P. Alexander, H. Andernach +25
For over four decades, synchrotron-radiating sources have played a series of pathfinding roles in the study of galaxy clusters and large scale structure. Such sources are uniquely…
Constraining blazar heating with the 2<z<3 Lyman- forest
A. Lamberts, E. Puchwein, C. Pfrommer +5
The intergalactic medium (IGM) acts like a calorimeter recording energy injection by cosmic structure formation, shocks and photoheating from stars and active galactic nuclei. It w…
Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes
MAGIC Collaboration, J. AleksiÄ, E. A. Alvarez +161
We report on the detection of very-high energy (VHE, E>100 GeV) gamma-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been d…
Simulations of cosmic ray feedback by AGN in galaxy clusters
D. Sijacki, C. Pfrommer, V. Springel +1
We investigate a numerical model for AGN feedback where for the first time a relativistic particle population in AGN-inflated bubbles is followed within a full cosmological context…
Impact of tangled magnetic fields on AGN-blown bubbles
M. Ruszkowski, T. A. Ensslin, M. Bruggen +2
There is growing consensus that feedback from AGN is the main mechanism responsible for stopping cooling flows in clusters of galaxies. AGN are known to inflate buoyant bubbles tha…
Non-Kolmogorov turbulence in multiphase intracluster medium driven by cold gas precipitation and AGN jets
C. Wang, M. Ruszkowski, C. Pfrommer +2
AGN feedback is responsible for maintaining plasma in global thermal balance in extended halos of elliptical galaxies and galaxy clusters. Local thermal instability in the hot gas…
The physics and cosmology of TeV blazars in a nutshell
C. Pfrommer, A. E. Broderick, P. Chang +2
The extragalactic gamma-ray sky at TeV energies is dominated by blazars, a subclass of accreting super-massive black holes with powerful relativistic outflows directed at us. Only…
Simulations of the Sunyaev-Zel'dovich Power Spectrum with AGN Feedback
N. Battaglia, J. R. Bond, C. Pfrommer +2
We explore how radiative cooling, supernova feedback, cosmic rays and a new model of the energetic feedback from active galactic nuclei (AGN) affect the thermal and kinetic Sunyaev…
Constraining Cosmic Rays and Magnetic Fields in the Perseus Galaxy Cluster with TeV observations by the MAGIC telescopes
MAGIC Collaboration, J. AleksiÄ, E. A. Alvarez +161
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…
Exploring the magnetized cosmic web through low frequency radio emission
N. Battaglia, C. Pfrommer, J. L. Sievers +2
Recent improvements in the capabilities of low frequency radio telescopes provide a unique opportunity to study thermal and non-thermal properties of the cosmic web. We argue that…
Simulating Gamma-ray Emission in Star-forming Galaxies
C. Pfrommer, R. Pakmor, C. M. Simpson +1
Star forming galaxies emit GeV- and TeV-gamma rays that are thought to originate from hadronic interactions of cosmic-ray (CR) nuclei with the interstellar medium. To understand th…
Galaxy Cluster Astrophysics and Cosmology: Questions and Opportunities for the Coming Decade
S. T. Myers, C. Pfrommer, J. Aguirre +21
We are learning much about how structure forms, in particular how clusters as nodes in the cosmic web evolve and accrete matter, and about the physical processes within these objec…
Detection of very high energy gamma-ray emission from the Perseus cluster head-tail galaxy IC 310 by the MAGIC telescopes
MAGIC Collaboration, J. AleksiÄ, L. A. Antonelli +151
We report on the detection with the MAGIC telescopes of very high energy gamma-rays from IC 310, a head-tail radio galaxy in the Perseus galaxy cluster, observed during the interva…
A Comparison of Cosmological Codes: Properties of Thermal Gas and Shock Waves in Large Scale Structures
F. Vazza, K. Dolag, D. Ryu +4
[...] We present results for the statistics of thermal gas and the shock wave properties for a large volume simulated with three different cosmological numerical codes: the Euleria…
Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters
M. Ackermann, M. Ajello, A. Albert +123
Current theories predict relativistic hadronic particle populations in clusters of galaxies in addition to the already observed relativistic leptons. In these scenarios hadronic in…
On the Cluster Physics of Sunyaev-Zel'dovich Surveys I: The Influence of Feedback, Non-thermal Pressure and Cluster Shapes on Y-M Scaling Relations
N. Battaglia, J. R. Bond, C. Pfrommer +1
The utility of large Sunyaev Zel'dovich (SZ) surveys for determining cosmological parameters from cluster abundances is limited by the theoretical uncertainties in the integrated S…
Constraints on Cosmic Rays, Magnetic Fields, and Dark Matter from Gamma-Ray Observations of the Coma Cluster of Galaxies with VERITAS and Fermi
T. Arlen, T. Aune, M. Beilicke +81
Observations of radio halos and relics in galaxy clusters indicate efficient electron acceleration. Protons should likewise be accelerated, suggesting that clusters may also be sou…
On the Cluster Physics of Sunyaev-Zel'dovich and X-ray Surveys III: Measurement Biases and Cosmological Evolution of Gas and Stellar Mass Fractions
N. Battaglia, J. R. Bond, C. Pfrommer +1
Gas masses tightly correlate with the virial masses of galaxy clusters, allowing for a precise determination of cosmological parameters by means of large-scale X-ray surveys. Howev…
Whistler-regulated MHD: Transport equations for electron thermal conduction in the high intracluster medium of galaxy clusters
J. F. Drake, C. Pfrommer, C. S. Reynolds +6
Transport equations for electron thermal energy in the high intracluster medium (ICM) are developed that include scattering from both classical collisions and self-generated…
Draping of Cluster Magnetic Fields over Bullets and Bubbles -- Morphology and Dynamic Effects
L. J. Dursi, C. Pfrommer
High-resolution X-ray observations have revealed cavities and `cold fronts' with sharp edges in temperature, density, and metallicity within galaxy clusters. Their presence poses a…
Simulating cosmic ray physics on a moving mesh
C. Pfrommer, R. Pakmor, K. Schaal +2
We discuss new methods to integrate the cosmic ray (CR) evolution equations coupled to magneto-hydrodynamics (MHD) on an unstructured moving mesh, as realised in the massively para…