Browsing University of Hertfordshire by Author "Shimwell, Tim W."

Now showing items 1-5 of 5

    • The discovery of a radio galaxy of at least 5 Mpc 

      Oei, Martijn S. S. L.; Weeren, Reinout J. van; Hardcastle, Martin J.; Botteon, Andrea; Shimwell, Tim W.; Dabhade, Pratik; Gast, Aivin R. D. J. G. I. B.; Röttgering, Huub J. A.; Brüggen, Marcus; Tasse, Cyril; Williams, Wendy L.; Shulevski, Aleksandar (2022-04-01)
      Context. Giant radio galaxies (GRGs, or colloquially giants) are the Universes largest structures generated by individual galaxies. They comprise synchrotron-radiating active galactic nucleus ejecta and attain cosmological ...

    • An intergalactic medium temperature from a giant radio galaxy 

      Oei, Martijn S. S. L.; Weeren, Reinout J. van; Hardcastle, Martin J.; Vazza, Franco; Shimwell, Tim W.; Leclercq, Florent; Brüggen, Marcus; Röttgering, Huub J. A. (2022-10-16)
      The warm-hot intergalactic medium (warm-hot IGM, or WHIM) pervades the filaments of the Cosmic Web and harbours half of the Universe's baryons. The WHIM's thermodynamic properties are notoriously hard to measure. Here we ...

    • Low-frequency radio absorption in Tycho's supernova remnant 

      Arias, Maria; Vink, Jacco; Zhou, Ping; Gasperin, Francesco de; Hardcastle, Martin J.; Shimwell, Tim W. (2019-12-02)
      Tycho's SNR is the remnant of the type Ia supernova explosion SN1572. In this work we present new low-frequency radio observations with the LOFAR Low-Band and High-Band Antennae, centred at 58 MHz and 143 MHz, and with an ...

    • A machine-learning classifier for LOFAR radio galaxy cross-matching techniques 

      Alegre, Lara; Sabater, Jose; Best, Philip; Mostert, Rafaël I.~J.; Williams, Wendy L.; Gürkan, Gülay; Hardcastle, Martin J.; Kondapally, Rohit; Shimwell, Tim W.; Smith, Daniel J.~B. (2022-08-30)
      New-generation radio telescopes like LOFAR are conducting extensive sky surveys, detecting millions of sources. To maximize the scientific value of these surveys, radio source components must be properly associated into ...

    • Measuring the giant radio galaxy length distribution with the LoTSS 

      Oei, Martijn S. S. L.; Weeren, Reinout J. van; Gast, Aivin R. D. J. G. I. B.; Botteon, Andrea; Hardcastle, Martin J.; Dabhade, Pratik; Shimwell, Tim W.; Röttgering, Huub J. A.; Drabent, Alexander (2023-04-19)
      Context. Many massive galaxies launch jets from the accretion disk of their central black hole, but only ∼103 instances are known in which the associated outflows form giant radio galaxies (GRGs, or giants): luminous ...