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An important, open research topic today is to understand the relevance that dark matter halo substructure may have for dark matter searches. In the standard cosmological model, halo substructure or subhalos are predicted to be largely abundant inside larger halos, for example, galaxies such as ours, and are thought to form first and later merge to form larger structures. Dwarf satellite galaxies—the most massive exponents of halo substructure in our own galaxy—are already known to be excellent targets for dark matter searches, and indeed, they are constantly scrutinized by current gamma-ray experiments in the search for dark matter signals. Lighter subhalos not massive enough to have a visible counterpart of stars and gas may be good targets as well, given their typical abundances and distances. In addition, the clumpy distribution of subhalos residing in larger halos may boost the dark matter signals considerably. In an era in which gamma-ray experiments possess, for the first time, the exciting potential to put to test the preferred dark matter particle theories, a profound knowledge of dark matter astrophysical targets and scenarios is mandatory should we aim for accurate predictions of dark matter-induced fluxes for investing significant telescope observing time on selected targets and for deriving robust conclusions from our dark matter search efforts. In this regard, a precise characterization of the statistical and structural properties of subhalos becomes critical. In this Special Issue, we aim to summarize where we stand today on our knowledge of the different aspects of the dark matter halo substructure; to identify what are the remaining big questions, and how we could address these; and, by doing so, to find new avenues for research.
gamma rays --- indirect searches. --- semi-analytic modeling --- cosmological model --- indirect dark matter searches --- particle dark matter --- indirect detection --- gamma-rays and neutrinos --- galactic subhalos --- indirect searches --- statistical data analysis --- subhalo boost --- dark matter halos --- halo substructure --- structure formation --- dark matter annihilation --- dark matter searches --- dwarf spheroidal satellite galaxies --- galactic sub-halos --- subhalos --- dwarf spheroidal galaxies --- gamma-rays --- cosmological N-body simulations --- dark matter
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It is common believe that the centers of all galaxies exhibit supermassive black holes with masses ranging from millions up to billions of the mass of our Sun. By accreting surrounding matter, the luminosity of these galactic nuclei can outshine the emission of their host galaxies. If this is the case, they are called active galactic nuclei. Some of these objects eject powerful outflows composed of plasma, called jets. These jets can produce non-thermal radiation which observable across the entire electromagnetic spectrum from radio up to the gamma-ray frequencies. At highest frequencies (TeV range) most of the detected active galaxies have jets directed along or close to the line of sight. However, also galaxies with larger angles to the line of sight showing fascinating features were discovered, in seeming contradiction to traditional models for these so-called radio galaxies. Thus, the latter are of particular importance for understanding active galactic nuclei in general. This Special Issue contains reviews and research articles about the current knowledge of radio galaxies at TeV energies, including observational results and theoretical models. It is intended to guide the interested reader deeper into this fascinating discipline of modern day astronomy.
radiation mechanisms: non-thermal --- emission: non-thermal --- 3C 84 --- radio galaxies --- TeV ?-rays --- X-rays: binaries --- general relativity --- jets --- Centaurus A --- light curve --- particle acceleration --- galaxies: active --- discrete correlation function --- relativistic processes ISM: jets and outflows --- VLBA --- origin: jet --- stars: black holes --- GeV ?-rays --- galaxies: jets --- magnetohydrodynamics --- active galactic nuclei --- radio galaxy --- origin: black hole --- TeV emission --- radio interferometry --- gamma-rays --- gamma-rays: observation --- gamma-rays: theory --- active galactic nucleus
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