Extragalactic Radio Sources as a Piece of the Cosmological Jigsaw
Early on, extragalactic radio sources have pointed to a cosmologically evolv- ing Universe. They were also an important piece of evidence for the existence of supermassive black holes, now thought to be a key component of galaxies. The observation that the power of radio sources increases with redshift, whereas the cosmological assembly of mass proceeds vice versa means that radio sources have their strongest impact in the early Universe. Our simulations suggest that radio sources heat hot halo gas, boost star formation in disc galaxies and other cold gas in the vicinity, possibly filaments, by a surround and squash mechanism. They might cause gaseous outflows in connection with stellar feedback. This might be an important mode of star formation for forming massive galaxies. Analysis of the jet-environment interaction may provide insights into black-hole physics and jet formation, e.g., rotational energy extraction (Blandford-Znajek) or how frequent black-hole binaries or multiple systems are. The former relates to fundamental questions about the nature of black holes. The latter is expected from hierarchical cosmology. Extragalactic radio sources thus continue to corroborate the cosmolog- ical picture and lead the way towards new, exciting discoveries.
Published inArXiv e-prints
MetadataShow full item record
Showing items related by title, author, creator and subject.
Tanga, M.; Schady, P.; Gatto, A.; Greiner, J.; Krause, M.~G.~H.; Diehl, R.; Savaglio, S.; Walch, S. (2016-11-01)Two-thirds of long duration gamma-ray bursts (GRBs) show soft X-ray absorption in excess of the Milky Way. The column densities of metals inferred from UV and optical spectra differ from those derived from soft X-ray ...
Siegert, T.; Diehl, R.; Vincent, A.~C.; Guglielmetti, F.; Krause, M.~G.~H.; Boehm, C. (2016-10-24)The positron annihilation gamma-ray signal in the Milky Way (MW) shows a puzzling morphology: a very bright bulge and a very low surface-brightness disk. A coherent explanation of the positron origin, propagation through ...
Forbrich, Jan; Rathbone, J.; Fuller, G.; Longmore, S.; Molinari, S. (2015-04)Over the next decade, observations conducted with ALMA and the SKA will reveal the process of mass assembly and accretion onto young stars and will be revolutionary for studies of star formation. Here we summarise the ...