Browsing University of Hertfordshire by Author "Shimwell, Timothy"

Now showing items 1-2 of 2

    • LoTSS/HETDEX: Optical quasars I. Low-frequency radio properties of optically selected quasars 

      Gürkan, Gülay; Hardcastle, Martin; Best, Philip; Morabito, Leah; Prandoni, Isabella; Jarvis, Matt; Duncan, Ken; Rivera, Gabriela Calistro; Callingham, Joe; Cochrane, Rachel; Croston, Judith; Heald, George; Mingo, Beatriz; Mooney, Sean; Sabater, Jose; Röttgering, Huub; Shimwell, Timothy; Smith, Dan; Tasse, Cyril; Williams, Wendy (2018-10-10)
      The radio-loud/radio-quiet (RL/RQ) dichotomy in quasars is still an open question. Although it is thought that accretion onto supermassive black holes in the centre the host galaxies of quasars is responsible for some radio ...

    • Radio constraints on dark matter annihilation in Canes Venatici I with LOFAR 

      Vollmann, Martin; Heesen, Volker; Shimwell, Timothy; Hardcastle, Martin J.; Brüggen, Marcus; Sigl, Günter; Röttgering, Huub (2020-06-13)
      Dwarf galaxies are dark matter-dominated and therefore promising targets for the search for weakly interacting massive particles (WIMPs), which are well-known candidates for dark matter. Annihilation of WIMPs produce ...