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19 papers · 1 filter
Rates of tidal disruption events from constrained cosmological simulations of the local Universe: population properties and implications for transient surveys
Julian S. Sommer, Ildar Khabibullin, Klaus Dolag +4
(abridged) Motivated by upcoming surveys like LSST, we estimate tidal disruption event (TDE) rates using the constrained cosmological Simulation of the LOcal Web (SLOW) to test the…
CRESCENDO II: Spectral cosmic rays with improved energy losses and realistic supernova seeding
Daniel Karner, Ludwig M. Böss, Klaus Dolag +1
Context. Cosmological simulation codes with subgrid models for cosmic rays (CRs) help us better understand their impact on baryonic feedback and non-thermal radiation in galaxies a…
Simulating the LOcal Web (SLOW) -- VI: Gamma-ray Emission in the Local Universe
Ludwig M. Böss, Ildar Khabibullin, Daniel Karner +4
Context: Diffuse -ray emission from cosmic-ray (CR) protons scattering off the gas in the intracluster and intergalactic medium remains out of reach for current observations. De…
Perseus cluster in its X-ray entirety with SRG/eROSITA. Merger and Radio-Uroboroses
Eugene Churazov, Ildar Khabibullin, Natalya Lyskova +2
The Perseus cluster (Abell 426) is a nearby massive galaxy cluster that spans several degrees. We combined SRG/eROSITA, XMM-Newton, and Chandra data to get a complete coverage of t…
The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
A. Merloni, G. Lamer, T. Liu +142
The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite began surveying the sky in December 2019, with the aim of producing all-sky X-ray source lists and sk…
A formation mechanism for "Wrong Way" Radio Relics
Ludwig M. Böss, Ulrich P. Steinwandel, Klaus Dolag
Radio Relics are typically found to be arc-like regions of synchrotron emission in the outskirts of merging galaxy clusters, bowing out from the cluster center. In most cases they…
Mapping the Intracluster Medium in the Era of High-resolution X-ray Spectroscopy
Congyao Zhang, Irina Zhuravleva, Maxim Markevitch +24
High-resolution spectroscopy in soft X-rays will open a new window to map multiphase gas in galaxy clusters and probe physics of the intracluster medium (ICM), including chemical e…
Galaxy Cluster simulations with a spectral Cosmic Ray model -- "Wrong Way" Radio Relics
Ludwig M. Böss, Ulrich P. Steinwandel, Klaus Dolag
Non-thermal emission from relativistic electrons gives insight into the strength and morphology of intra-cluster magnetic fields, as well as providing powerful tracers of structure…
Prospects of detecting soft X-ray emission from typical WHIM filaments around massive clusters and the Coma cluster soft excess
E. Churazov, I. I. Khabibullin, K. Dolag +2
While hot ICM in galaxy clusters makes these objects powerful X-ray sources, the cluster's outskirts and overdense gaseous filaments might give rise to much fainter sub-keV emissio…
Decomposition of galactic X-ray emission with Phox: Contributions from hot gas and XRBs
Stephan Vladutescu-Zopp, Veronica Biffi, Klaus Dolag
We provide a numerical framework with which spatially and spectrally accurate representations of X-ray binary populations can be studied from hydrodynamical cosmological simulation…
CRESCENDO: An on-the-fly Fokker-Planck Solver for Spectral Cosmic Rays in Cosmological Simulations
Ludwig M. Böss, Ulrich P. Steinwandel, Klaus Dolag +1
Non-thermal emission from relativistic Cosmic Ray (CR) electrons gives insight into the strength and morphology of intra-cluster magnetic fields, as well as providing powerful trac…
Collision of Merger and Accretion Shocks: Formation of Mpc-scale Contact Discontinuity in the Perseus Cluster
Congyao Zhang, Eugene Churazov, Klaus Dolag +2
Two Mpc-size contact discontinuities have recently been identified in the XMM-Newton and Suzaku X-ray observations of the outskirts of the Perseus cluster (Walker et al. 2020). The…
Characterizing the Uncertainty in Cluster Magnetic Fields derived from Rotation Measures
Andrew Johnson, Lawrence Rudnick, Thomas Jones +2
Magnetic fields play vital roles in intracluster media (ICMs), but estimating their strengths and distributions from observations is a major challenge. Faraday rotation measures (R…
The Hot and Energetic Universe: The missing baryons and the warm-hot intergalactic medium
Jelle Kaastra, Alexis Finoguenov, Fabrizio Nicastro +19
The backbone of the large-scale structure of the Universe is determined by processes on a cosmological scale and by the gravitational interaction of the dominant dark matter. Howev…
The Hot and Energetic Universe: The evolution of galaxy groups and clusters
E. Pointecouteau, T. H. Reiprich, C. Adami +45
Major astrophysical questions related to the formation and evolution of structures, and more specifically of galaxy groups and clusters, will still be open in the coming decade and…
The Hot and Energetic Universe: A White Paper presenting the science theme motivating the Athena+ mission
Kirpal Nandra, Didier Barret, Xavier Barcons +237
This White Paper, submitted to the recent ESA call for science themes to define its future large missions, advocates the need for a transformational leap in our understanding of tw…
Resonant scattering in galaxy clusters for anisotropic gas motions on various spatial scales
I. Zhuravleva, E. Churazov, S. Sazonov +2
The determination of characteristic amplitudes and anisotropy of hot gas motions in galaxy clusters from observations of the brightest resonance lines is discussed. Gas motions aff…
Polarization of X-ray lines from galaxy clusters and elliptical galaxies - a way to measure tangential component of gas velocity
I. V. Zhuravleva, E. M. Churazov, S. Yu. Sazonov +3
We study the impact of gas motions on the polarization of bright X-ray emission lines from the hot intercluster medium (ICM). The polarization naturally arises from resonant scatte…
Blazar halos as probe for extragalactic magnetic fields and maximal acceleration energy
K. Dolag, M. Kachelriess, S. Ostapchenko +1
High energy photons from blazars interact within tens of kpc with the extragalactic photon background, initiating electromagnetic pair cascades. The charged component of such casca…