Browsing University of Hertfordshire by Author "Williams, Wendy"

Now showing items 1-4 of 4

    • 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 ...

    • NIR Tully-Fisher in the Zone of Avoidance. -- III. Deep NIR catalogue of the HIZOA galaxies 

      Said, Khaled; Kraan-Korteweg, Renée C.; Jarrett, T. H.; Staveley-Smith, Lister; Williams, Wendy (2016-11-01)
      We present a deep near-infrared (NIR) photometric catalogue of sources from the Parkes HI Zone of Avoidance (HIZOA) survey, which forms the basis for an investigation of the matter distribution in the Zone of Avoidance. ...

    • Radio spectra of bright compact sources at z>4.5 

      Coppejans, Rocco; Velzen, Sjoert van; Intema, Huib T.; Müller, Cornelia; Frey, Sándor; Coppejans, Deanne L.; Cseh, Dávid; Williams, Wendy; Falcke, Heino; Körding, Elmar G.; Orrú, Emanuela; Paragi, Zsolt; Gabányi, Krisztina É. (2017-05-01)
      High-redshift quasars are important to study galaxy and active galactic nuclei (AGN) evolution, test cosmological models, and study supermassive black hole growth. Optical searches for high-redshift sources have been very ...

    • The XXL Survey: : XXIX. GMRT 610 MHz continuum observations 

      Smolcic, Vernesa; Intema, Huib; Slaus, Bruno; Raychaudhury, Somak; Novak, Mladen; Horellou, Cathy; Chiappetti, Lucio; Delhaize, Jacinta; Birkinshaw, Mark; Bondi, Marco; Bremer, Malcolm; Ciliegi, Paolo; Ferrari, Chiara; Kolokythas, Konstantinos; Lidman, Chris; McGee, Sean L.; Norris, Ray; Pierre, Marguerite; Rottgering, Huub; Tasse, Cyril; Williams, Wendy (2018-12-01)
      We present the 25 square-degree GMRT-XXL-N 610 MHz radio continuum survey, conducted at 50 cm wavelength with the Giant Metrewave Radio Telescope (GMRT) towards the XXL Northern field (XXL-N). We combined previously published ...