Browsing by Author "Morabito, Leah K."

Now showing items 1-13 of 13

    • Blazars in the LOFAR Two-Metre Sky Survey First Data Release 

      Mooney, S.; Quinn, J.; Callingham, J. R.; Morganti, R.; Duncan, K.; Morabito, Leah K.; Best, P. N.; Gürkan, G.; Hardcastle, M. J.; Prandoni, I.; Röttgering, H. J. A.; Sabater, J.; Shimwell, T. W.; Shulevski, A.; Tasse, C.; Williams, W. L. (2018-11-19)
      Historically, the blazar population has been poorly understood at low frequencies because survey sensitivity and angular resolution limitations have made it difficult to identify megahertz counterparts. We used the LOFAR ...

    • The Far-Infrared Radio Correlation at low radio frequency with LOFAR/H-ATLAS 

      Read, Shaun; Smith, Daniel; Gurkan, Gulay; Hardcastle, Martin; Williams, Wendy Louise; Best, P.N.; Brinks, Elias; Calistro-Rivera, Gabriela; Chyzy, K.T.; Duncan, Kenneth J.; Dunne, Loretta; Jarvis, M. J.; Morabito, Leah K.; Prandoni, I.; Rottgering, H. J. A.; Sabater, Jose; Viaene, Sébastien (2018-11-30)
      The radio and far-infrared luminosities of star-forming galaxies are tightly correlated over several orders of magnitude; this is known as the far-infrared radio correlation (FIRC). Previous studies have shown that a host ...

    • High-resolution international LOFAR observations of 4C~43.15 -- Spectral ages and injection indices in a high-z radio galaxy 

      Sweijen, Frits; Morabito, Leah K.; Harwood, Jeremy; Weeren, Reinout J. van; Röttgering, Huub J. A.; Callingham, Joseph R.; Jackson, Neal; Miley, George; Moldon, Javier (2022-02-01)
      It has long been known that radio sources with the steepest spectra are preferentially associated with the most distant galaxies, the α - z relation, but the reason for this relation is an open question. The spatial ...

    • Investigating the cause of the $α\,$-$\,z$ relation 

      Morabito, Leah K.; Harwood, Jeremy J. (2018-10-01)
      The correlation between radio spectral index and redshift has long been used to identify high-redshift radio galaxies, but its cause is unknown. Traditional explanations invoke either intrinsic relations between spectral ...

    • Investigating the Unification of LOFAR-detected powerful AGN in the Boötes Field 

      Morabito, Leah K.; Williams, W. L.; Duncan, Kenneth J.; Röttgering, H.~J.~A.; Miley, George; Saxena, Aayush; Barthel, Peter; Best, Philip N.; Bruggen, M.; Brunetti, G.; Chyży, K. T.; Engels, D.; Hardcastle, M. J.; Harwood, J. J.; Jarvis, Matt J.; Mahony, E. K.; Prandoni, I.; Shimwell, Timothy W.; Shulevski, Alexander; Tasse, C. (2017-08-01)
      Low radio frequency surveys are important for testing unified models of radio-loud quasars and radio galaxies. Intrinsically similar sources that are randomly oriented on the sky will have different projected linear sizes. ...

    • LOFAR observations of the XMM-LSS field 

      Hale, C. L.; Williams, W.; Jarvis, M. J.; Hardcastle, M. J.; Morabito, Leah K.; Shimwell, T. W.; Tasse, C.; Best, P. N.; Harwood, J. J.; Heywood, I.; Prandoni, I.; Röttgering, H. J. A.; Sabater, J.; Smith, D. J. B.; Weeren, R. J. van (2018-11-19)
      We present observations of the XMM Large-Scale Structure (XMM-LSS) field observed with the LOw Frequency ARray (LOFAR) at 120-168 MHz. Centred at a J2000 declination of $-4.5^{\circ}$, this is a challenging field to observe ...

    • The LOFAR Two-metre Sky Survey: The nature of the faint source population and SFR-radio luminosity relation using PROSPECTOR 

      Das, Soumyadeep; Smith, Daniel J. B.; Haskell, Paul; Hardcastle, Martin J.; Best, Philip N.; Duncan, Kenneth J.; Arnaudova, Marina I.; Shenoy, Shravya; Kondapally, Rohit; Cochrane, Rachel K.; Drake, Alyssa B.; Gürkan, Gülay; Małek, Katarzyna; Morabito, Leah K.; Prandoni, Isabella (2024-06-01)
      Spectral energy distribution (SED) fitting has been e xtensiv ely used to determine the nature of the faint radio source population. Recent efforts have combined fits from multiple SED-fitting codes to account for the host ...

    • LoTSS DR1 : Double-double radio galaxies in the HETDEX field 

      Mahatma, V. H.; Hardcastle, M. J.; Williams, W. L.; Best, P. N.; Croston, J. H.; Duncan, K.; Mingo, B.; Morganti, R.; Brienza, M.; Cochrane, R. K.; Gürkan, G.; Harwood, J. J.; Jarvis, M. J.; Jamrozy, M.; Jurlin, N.; Morabito, Leah K.; Röttgering, H. J. A.; Sabater, J.; Shimwell, T. W.; Smith, D. J. B.; Shulevski, A.; Tasse, C. (2018-11-20)
      Double-double radio galaxies (DDRGs) represent a short but unique phase in the life-cycle of some of the most powerful radio-loud active galactic nuclei (RLAGN). These galaxies display large-scale remnant radio plasma in ...

    • The LoTSS view of radio AGN in the local Universe. The most massive galaxies are always switched on 

      Sabater, J.; Best, P.N.; Hardcastle, M. J.; Shimwell, T. W.; Tasse, C.; Williams, W. L.; Brüggen, M.; Cochrane, R. K.; Croston, J. H.; Gasperin, F. de; Duncan, K. J.; Gürkan, G.; Mechev, A. P.; Morabito, Leah K.; Prandoni, I.; Röttgering, H. J. A.; Smith, D. J. B.; Harwood, J. J.; Mingo, B.; Mooney, S.; Saxena, A. (2018-11-15)
      This paper presents a study of the local radio source population, by cross-comparing the data from the first data release (DR1) of the LOFAR Two-Metre Sky Survey (LoTSS) with the Sloan Digital Sky Survey (SDSS) DR7 main ...

    • The resolved jet of 3C 273 at 150 MHz : Sub-arcsecond imaging with the LOFAR international baselines 

      Harwood, Jeremy J.; Mooney, Sean; Morabito, Leah K.; Quinn, John; Sweijen, Frits; Groeneveld, Christian; Bonnassieux, Etienne; Kappes, Alexander; Moldon, Javier (2022-02-01)
      Context. Since its discovery in 1963, 3C 273 has become one of the most widely studied quasars with investigations spanning the electromagnetic spectrum. While much has therefore been discovered about this historically ...

    • Spectral analysis of spatially-resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope 

      Bonnassieux, Etienne; Sweijen, Frits; Brienza, Marisa; Rajpurohit, Kamlesh; Riseley, Christopher John; Bonafede, Annalisa; Jackson, Neal; Morabito, Leah K.; Brunetti, Gianfranco; Harwood, Jeremy; Kappes, Alex; Rottgering, Huub J.; Tasse, Cyril; Weeren, Reinout van (2022-02-25)
      3C295 is a bright, compact steep spectrum source with a well-studied integrated radio spectral energy distribution (SED) from 132 MHz to 15 GHz. However, spatially resolved spectral studies have been limited due to a lack ...

    • Subarcsecond view on the high-redshift blazar GB 1508+5714 by the International LOFAR Telescope 

      Kappes, A.; Burd, P. R.; Kadler, M.; Ghisellini, G.; Bonnassieux, E.; Perucho, M.; Brüggen, Marcus; Cheung, C. C.; Ciardi, B.; Gallo, E.; Haardt, F.; Morabito, Leah K.; Sbarrato, T.; Drabent, A.; Harwood, J.; Jackson, N. J.; Moldon, Javier (2022-07-12)
      Context. Studies of the most distant active galactic nuclei (AGNs) allow us to test our current understanding of the physics present in radio-jetted AGNs across a range of environments, and probe their interactions with ...

    • Unmasking the history of 3C 293 with LOFAR sub‐arcsecond imaging 

      Kukreti, Pranav; Morganti, Raffaella; Shimwell, Timothy W.; Morabito, Leah K.; Beswick, Robert J.; Brienza, Marisa; Hardcastle, Martin J.; Sweijen, Frits; Jackson, Neal; Miley, George K.; Moldon, Javier; Oosterloo, Tom; Gasperin, Francesco de (2021-12-07)
      Active galactic nuclei show episodic activity, which can be evident in galaxies that exhibit restarted radio jets. These restarted jets can interact with their environment, leaving signatures in the radio spectral energy ...