Search

Now showing items 1-10 of 33

Radio AGN in nearby dwarf galaxies: the important role of AGN in dwarf-galaxy evolution

Davis, F.; Kaviraj, S.; Hardcastle, M. J.; Martin, G.; Jackson, R. A.; Kraljic, K.; Malek, K.; Peirani, S.; Smith, D. J. B.; Volonteri, M.; Wang, L. (2022-02-04)

We combine deep optical and radio data, from the Hyper Suprime-Cam and the Low-Frequency Array (LOFAR) respectively, to study 78 radio AGN in nearby (z < 0.5) dwarf galaxies. Comparison to a control sample, matched in ...

The Application of Ridgelines in Extended Radio Source Cross-Identification

Barkus, B.; Croston, J. H.; Piotrowska, J.; Mingo, B.; Best, P. N.; Hardcastle, M. J.; Mostert, R. I. J.; Röttgering, H. J. A.; Sabater, J.; Webster, B.; Williams, W. L. (2021-10-22)

Extended radio sources are an important minority population in modern deep radio surveys, because they enable detailed investigation of the physics governing radio-emitting regions such as active galaxies and their ...

MIGHTEE: total intensity radio continuum imaging and the COSMOS / XMM-LSS Early Science fields

Heywood, I.; Jarvis, M. J.; Hale, C. L.; Whittam, I. H.; Bester, H. L.; Hugo, B.; Kenyon, J. S.; Prescott, M.; Smirnov, O. M.; Tasse, C.; Afonso, J. M.; Best, P. N.; Collier, J. D.; Deane, R. P.; Frank, B. S.; Hardcastle, M. J.; Knowles, K.; Maddox, N.; Murphy, E. J.; Prandoni, I.; Randriamampandry, S. M.; Santos, M. G.; Sekhar, S.; Tabatabaei, F.; Taylor, A. R.; Thorat, K. (2021-10-21)

MIGHTEE is a galaxy evolution survey using simultaneous radio continuum, spectro-polarimetry, and spectral line observations from the South African MeerKAT telescope. When complete, the survey will image $\sim$20 deg$^{2}$ ...

A snapshot of the oldest AGN feedback phases

Brienza, M.; Shimwell, T. W.; Gasperin, F. de; Bikmaev, I.; Bonafede, A.; Botteon, A.; Brüggen, M.; Brunetti, G.; Burenin, R.; Capetti, A.; Churazov, E.; Hardcastle, M. J.; Khabibullin, I.; Lyskova, N.; R öttgering, H. J. A.; Sunyaev, R.; Weeren, R. J. van; Gastaldello, F.; Mandal, S.; Purser, S.; Simionescu, A.; Tasse, C. (2021-10-18)

Active Galactic Nuclei (AGN) inject large amounts of energy into their host galaxies and surrounding environment, shaping their properties and evolution. In particular, AGN jets inflate cosmic-ray lobes, which can rise ...

Investigating the spectra and physical nature of galaxy scale jets

Webster, B.; Croston, J. H.; Harwood, J. J.; Baldi, R. D.; Hardcastle, M. J.; Mingo, B.; Rottgering, H. J. A. (2021-10-13)

Previous studies have shown that physically small, low-luminosity radio galaxies, which we refer to as galaxy scale jets (GSJ), could potentially have a significant effect upon the host galaxy's evolution. Using 6 arcsec ...

The population of M dwarfs observed at low radio frequencies

Callingham, J. R.; Vedantham, H. K.; Shimwell, T. W.; Pope, B. J. S.; Davis, I. E.; Best, P. N.; Hardcastle, M. J.; Rottgering, H. J. A.; Sabater, J.; Tasse, C.; Weeren, R. J. van; Williams, W. L.; Zarka, P.; Gasperin, F. de; Drabent, A. (2021-10-11)

Coherent low-frequency (≲200 MHz) radio emission from stars encodes the conditions of the outer corona, mass-ejection events and space weather 1–5. Previous low-frequency searches for radio-emitting stellar systems have ...

The eROSITA Final Equatorial-Depth Survey (eFEDS). LOFAR view of brightest cluster galaxies and AGN feedback

Pasini, T.; Brüggen, M.; Hoang, D. H.; Ghirardini, V.; Bulbul, E.; Klein, M.; Liu, A.; Shimwell, T. W.; Hardcastle, M. J.; Williams, W. L.; Botteon, A.; Gastaldello, F.; Weeren, R. J. van; Merloni, A.; Gasperin, F. de; Bahar, Y. E.; Pacaud, F.; Ramos-Ceja, M. (2021-07-06)

Context. During the performance verification phase of the Spectrum-Roentgen-Gamma (SRG) eROSITA telescope, the eROSITA Final Equatorial-Depth Survey (eFEDS) was carried out. It covers a 140 deg2 field located at 126◦ < ...

Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole

Ramasawmy, J.; Geach, J. E.; Hardcastle, M. J.; Best, P. N.; Bonato, M.; Bondi, M.; Rivera, G. Calistro; Cochrane, R. K.; Conway, J. E.; Coppin, K.; Duncan, K. J.; Dunlop, J. S.; Franco, M.; García-Vergara, C.; Jarvis, M. J.; Kondapally, R.; McCheyne, I.; Prandoni, I.; Röttgering, H. J. A.; Smith, D. J. B.; Tasse, C.; Wang, L. (2021-04-19)

We investigate the radio properties of a sample of 53 sources selected at 850 $\mu$m from the SCUBA-2 Cosmology Legacy Survey using new deep, low-frequency radio imaging of the Lockman Hole field from the Low Frequency ...

LOFAR Deep Fields : Probing a broader population of polarized radio galaxies in ELAIS-N1

Ruiz, N. Herrera; O'Sullivan, S. P.; Vacca, V.; Jelić, V.; Nikiel-Wroczyński, B.; Bourke, S.; Sabater, J.; Dettmar, R. -J.; Heald, G.; Horellou, C.; Piras, S.; Sobey, C.; Shimwell, T. W.; Tasse, C.; Hardcastle, M. J.; Kondapally, R.; Chyży, K. T.; Iacobelli, M.; Best, P. N.; Brüggen, M.; Carretti, E.; Prandoni, I. (2021-04-07)

We present deep polarimetric observations of the European Large Area ISO Survey-North 1 (ELAIS-N1) field using the Low Frequency Array (LOFAR) at 114.9-177.4 MHz. The ELAIS-N1 field is part of the LOFAR Two-metre Sky Survey ...

The LOFAR Two-metre Sky Survey Deep fields: : The star formation rate - radio luminosity relation at low frequencies

Smith, D. J. B.; Haskell, P.; Gürkan, G.; Best, P. N.; Hardcastle, M. J.; Kondapally, R.; Williams, W.; Duncan, K. J.; Cochrane, R. K.; McCheyne, I.; Röttgering, H. J. A.; Sabater, J.; Shimwell, T. W.; Tasse, C.; Bonato, M.; Bondi, M.; Jarvis, M. J.; Leslie, S. K.; Prandoni, I.; Wang, L. (2021-04-07)

In this paper, we investigate the relationship between 150 MHz luminosity and the star-formation rate - the SFR-L150 MHz relation - using 150 MHz measurements for a near-infrared selected sample of 118 517 z < 1 galaxies. ...