Now showing items 1-20 of 43

    • The best of both worlds : Combining LOFAR and Apertif to derive resolved radio spectral index images 

      Morganti, R.; Oosterloo, T. A.; Brienza, M.; Jurlin, N.; Prandoni, I.; Orru', E.; Shabala, S. S.; Adams, E. A. K.; Adebahr, B.; Best, P. N.; Coolen, A. H. W. M.; Damstra, S.; Blok, W. J. G. de; Gasperin, F. de; Denes, H.; Hardcastle, M.; Hess, K. M.; Hut, B.; Kondapally, R.; Kutkin, A. M.; Loose, G. M.; Lucero, D. M.; Maan, Y.; Maccagni, F. M.; Mingo, B.; Moss, V. A.; Mostert, R. I. J.; Norden, M. J.; Oostrum, L. C.; Rottgering, H. J. A.; Ruiter, M.; Shimwell, T. W.; Schulz, R.; Vermaas, N. J.; Vohl, D.; Hulst, J. M. van der; Diepen, G. M. van; Leeuwen, J. van; Ziemke, J. (2021-04-07)
      Supermassive black holes at the centres of galaxies can cycle through periods of activity and quiescence. Characterising the duty cycle of active galactic nuclei is crucial for understanding the impact of the energy they ...
    • 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 bright end of the infrared luminosity functions and the abundance of hyperluminous infrared galaxies 

      Wang, L.; Gao, F.; Best, P. N.; Duncan, K.; Hardcastle, M. J.; Kondapally, R.; Malek, K.; McCheyne, I.; Sabater, J.; Shimwell, T.; Tasse, C.; Bonato, M.; Bondi, M.; Cochrane, R. K.; Farrah, D.; Gurkan, G.; Haskell, P.; Pearson, W. J.; Prandoni, I.; Rottgering, H. J. A.; Smith, D. J. B.; Vaccari, M.; Williams, W. L. (2021-04-07)
      We provide the most accurate estimate yet of the bright end of the infrared (IR) luminosity functions (LFs) and the abundance of hyperluminous IR galaxies (HLIRGs) with IR luminosities > 10^13 L_solar, thanks to the ...
    • The contribution of discrete sources to the sky temperature at 144 MHz 

      Hardcastle, M. J.; Shimwell, T. W.; Tasse, C.; Best, P. N.; Drabent, A.; Jarvis, M. J.; Prandoni, I.; Rottgering, H. J. A.; Sabater, J.; Schwarz, D. J. (2021-04-07)
      In recent years, the level of the extragalactic radio background has become a point of considerable interest, with some lines of argument pointing to an entirely new cosmological synchrotron background. The contribution ...
    • The e-MERLIN Galaxy Evolution Survey (e-MERGE) : Overview and Survey Description 

      Muxlow, T. W. B.; Wrigley, N. H.; Beswick, R. J.; Smail, Ian; McHardy, I. M.; Garrington, S. T.; Ivison, R. J.; Jarvis, M. J.; Prandoni, I.; Bondi, M.; Guidetti, D.; Argo, M. K.; Bacon, David; Best, P. N.; Biggs, A. D.; Chapman, S. C.; Coppin, K.; Chen, H.; Garratt, T. K.; Garrett, M. A.; Ibar, E.; Kneib, Jean-Paul; Knudsen, Kirsten K.; Koopmans, L. V. E.; Morabito, L. K.; Njeri, A.; Pearson, Chris; Perez-Torres, M. A.; Rottgering, H. J. A.; Sargent, M. T.; Serjeant, Stephen; Swinbank, A. M.; Varenius, E.; Venturi, T. (2020-05-08)
      We present an overview and description of the eMERLIN Galaxy Evolution survey (eMERGE) Data Release 1 (DR1), a large program of high-resolution 1.5 GHz radio observations of the GOODS-N field comprising $\sim140$ hours of ...
    • EMU : Evolutionary Map of the Universe 

      Norris, Ray P.; Hopkins, A. M.; Afonso, J.; Brown, S.; Condon, J. J.; Dunne, L.; Feain, I.; Hollow, R.; Jarvis, M.J.; Johnston-Hollitt, M.; Lenc, E.; Middelberg, E.; Padovani, P.; Prandoni, I.; Rudnick, L.; Seymour, N.; Umana, G.; Andernach, H.; Alexander, D. M.; Appleton, P. N.; Bacon, D.; Banfield, J.; Becker, W.; Brown, M. J. I.; Ciliegi, P.; Jackson, C.; Eales, S.; Edge, A. C.; Gaensler, B. M.; Giovannini, G.; Hales, C. A.; Hancock, P.; Huynh, M. T.; Ibar, E.; Ivison, R. J.; Kennicutt, R.; Kimball, Amy E.; Koekemoer, A. M.; Koribalski, B. S.; Lopez-Sanchez, A. R.; Mao, M. Y.; Murphy, T.; Messias, H.; Pimbblet, K. A.; Raccanelli, A.; Randall, K. E.; Reiprich, T. H.; Roseboom, I. G.; Roettgering, H.; Saikia, D. J.; Sharp, R. G.; Slee, O. B.; Smail, Ian; Thompson, Mark; Urquhart, J. S.; Wall, J. V.; Zhao, G. -B. (2011)
      EMU is a wide-field radio continuum survey planned for the new Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The primary goal of EMU is to make a deep (rms ~ 10 microJy/beam) radio continuum survey of the ...
    • The environments of radio-loud AGN from the LOFAR Two-Metre Sky Survey (LoTSS) 

      Croston, J. H.; Hardcastle, M. J.; Mingo, B.; Best, P. N.; Sabater, J.; Shimwell, T. W.; Williams, W. L.; Duncan, K. J.; Röttgering, H. J. A.; Brienza, M.; Gürkan, G.; Ineson, J.; Morabito, L. M.; Miley, G. K.; O'Sullivan, S. P.; Prandoni, I. (2018-10-10)
      An understanding of the relationship between radio-loud active galaxies and their large-scale environments is essential for realistic modelling of radio-galaxy evolution and environmental impact, for understanding AGN ...
    • 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 (2018-11-11)
      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 ...
    • 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. ...
    • The life cycle of radio galaxies in the LOFAR Lockman Hole field 

      Jurlin, N.; Morganti, R.; Brienza, M.; Mandal, S.; Maddox, N.; Duncan, K. J.; Shabala, S. S.; Hardcastle, M. J.; Prandoni, I.; Röttgering, H. J. A.; Mahatma, V.; Best, P. N.; Mingo, B.; Sabater, J.; Shimwell, T. W.; Tasse, C. (2020-06-08)
      Radio galaxies are known to go through cycles of activity, where phases of apparent quiescence can be followed by repeated activity of the central supermassive black hole. A better understanding of this cycle is crucial ...
    • Link between radio-loud AGNs and host-galaxy shape 

      Zheng, X. C.; Röttgering, H. J. A.; Best, P. N.; Wel, A. van der; Hardcastle, M. J.; Williams, W. L.; Bonato, M.; Prandoni, I.; Smith, D. J. B.; Leslie, S. K. (2020-10-15)
      The morphology of quiescent galaxies has been found to be correlated with the activity of their central super massive black hole. In this work, we use data from the first data release of the LOFAR Two$-$Metre Sky Survey ...
    • The Lockman Hole project : LOFAR observations and spectral index properties of low-frequency radio sources 

      Mahony, E. K.; Morganti, R.; Prandoni, I.; Bemmel, I. M. van; Shimwell, T. W.; Brienza, M.; Best, P. N.; Brüggen, M.; Rivera, G. Calistro; Gasperin, F. de; Hardcastle, M. J.; Harwood, J. J.; Heald, G.; Jarvis, M. J.; Mandal, S.; Miley, G. K.; Retana-Montenegro, E.; Röttgering, H. J. A.; Sabater, J.; Tasse, C.; Velzen, S. van; Weeren, R. J. van; Williams, W. L.; White, G. J. (2016-12-11)
      The Lockman Hole is a well-studied extragalactic field with extensive multi-band ancillary data covering a wide range in frequency, essential for characterising the physical and evolutionary properties of the various source ...
    • LOFAR 150-MHz observations of the Boötes field: Catalogue and Source Counts 

      Williams, W. L.; Van Weeren, R. J.; Röttgering, H. J. A.; Best, P.; Dijkema, T. J.; Gasperin, F. de; Hardcastle, M. J.; Heald, G.; Prandoni, I.; Sabater, J.; Shimwell, T. W.; Tasse, C.; Bemmel, I. M. van; Brüggen, M.; Brunetti, G.; Conway, J. E.; Enßlin, T.; Engels, D.; Falcke, H.; Ferrari, C.; Haverkorn, M.; Jackson, N.; Jarvis, M. J.; Kapinska, A. D.; Mahony, E. K.; Miley, G. K.; Morabito, L. K.; Morganti, R.; Orrú, E.; Retana-Montenegro, E.; Sridhar, S. S.; Toribio, M. C.; White, G. J.; Wise, M. W.; Zwart, J. T. L. (2016-08-11)
      We present the first wide area (19 deg$^2$), deep ($\approx120-150$ {\mu}Jy beam$^{-1}$), high resolution ($5.6 \times 7.4$ arcsec) LOFAR High Band Antenna image of the Bo\"otes field made at 130-169 MHz. This image is at ...
    • 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 LBA Sky Survey I. survey description and preliminary data release 

      Gasperin, F. de; Williams, W. L.; Best, P.; Bruggen, M.; Brunetti, G.; Cuciti, V.; Dijkema, T. J.; Hardcastle, M. J.; Norden, M. J.; Offringa, A.; Shimwell, T.; Weeren, R. van; Bomans, D.; Bonafede, A.; Botteon, A.; Callingham, J. R.; Cassano, R.; Chyzy, K. T.; Emig, K. L.; Edler, H.; Haverkorn, M.; Heald, G.; Heesen, V.; Iacobelli, M.; Intema, H. T.; Kadler, M.; Malek, K.; Mevius, M.; Miley, G.; Mingo, B.; Morabito, L. K.; Sabater, J.; Morganti, R.; Orru, E.; Pizzo, R.; Prandoni, I.; Shulevski, A.; Tasse, C.; Vaccari, M.; Zarka, P.; Rottgering, H. (2021-02-17)
      Context. The LOw Frequency ARray (LOFAR)istheonlyradiotelescopethatispresentlycapableofhigh-sensitivity,high-resolution (i.e. < 1mJybeam−1 and < 1500) observations at ultra-low frequencies(< 100MHz). To utilise these ...
    • Lofar low-band antenna observations of the 3C 295 and boötes fields : Source counts and ultra-steep spectrum sources 

      Van Weeren, R. J.; Williams, W. L.; Tasse, C.; Röttgering, H. J.A.; Rafferty, D. A.; Van Der Tol, S.; Heald, G.; White, G. J.; Shulevski, A.; Best, P.; Intema, H. T.; Bhatnagar, S.; Reich, W.; Steinmetz, M.; Van Velzen, S.; Enßlin, T. A.; Prandoni, I.; De Gasperin, F.; Jamrozy, M.; Brunetti, G.; Jarvis, M. J.; McKean, J. P.; Wise, M. W.; Ferrari, C.; Harwood, J.; Oonk, J. B.R.; Hoeft, M.; Kunert-Bajraszewska, M.; Horellou, C.; Wucknitz, O.; Bonafede, A.; Mohan, N. R.; Scaife, A. M.M.; Klöckner, H. R.; Van Bemmel, I. M.; Merloni, A.; Chyzy, K. T.; Engels, D.; Falcke, H.; Pandey-Pommier, M.; Alexov, A.; Anderson, J.; Avruch, I. M.; Beck, R.; Bell, M. E.; Bentum, M. J.; Bernardi, G.; Breitling, F.; Broderick, J.; De Vos, M. (2014-10-01)
      We present Low Frequency Array (LOFAR) Low Band observations of the Boötes and 3C 295 fields. Our images made at 34, 46, and 62 MHz reach noise levels of 12, 8, and 5 mJy beam-1, making them the deepest images ever obtained ...
    • 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 ...
    • LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field 

      Gloudemans, A. J.; Duncan, K. J.; Kondapally, R.; Sabater, J.; Cochrane, R. K.; Röttgering, H. J. A.; Best, P. N.; Bonato, M.; Bondi, M.; Malek, K.; McCheyne, I.; Smith, D. J. B.; Prandoni, I.; Wang, L. (2021-04-07)
      Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of early galaxy evolution and the process of reionization; however, the exact evolution of their abundance and the nature of their emission ...
    • The LOFAR Two Meter Sky Survey : Deep Fields Data Release 1, I -- Direction-dependent calibration and imaging 

      Tasse, C.; Shimwell, T.; Hardcastle, M. J.; O'Sullivan, S. P.; Weeren, R. van; Best, P. N.; Bester, L.; Hugo, B.; Smirnov, O.; Sabater, J.; Calistro-Rivera, G.; Gasperin, F. de; Morabito, L. K.; Röttgering, H.; Williams, W. L.; Bonato, M.; Bondi, M.; Botteon, A.; Brüggen, M.; Brunetti, G.; Chyży, K. T.; Garrett, M. A.; Gürkan, G.; Jarvis, M. J.; Kondapally, R.; Mandal, S.; Prandoni, I.; Repetti, A.; Retana-Montenegro, E.; Schwarz, D. J.; Shulevski, A.; Wiaux, Y. (2021-04-07)
      The Low Frequency Array (LOFAR) is an ideal instrument to conduct deep extragalactic surveys. It has a large field of view and is sensitive to large scale and compact emission. It is, however, very challenging to synthesize ...
    • The LOFAR Two Metre Sky Survey: Deep Fields Data Release 1. III. Host-galaxy identifications and value added catalogues 

      Kondapally, R.; Best, P. N.; Hardcastle, M. J.; Nisbet, D.; Bonato, M.; Sabater, J.; Duncan, K. J.; McCheyne, I.; Cochrane, R. K.; Bowler, R. A. A.; Williams, W. L.; Shimwell, T. W.; Tasse, C.; Croston, J. H.; Goyal, A.; Jamrozy, M.; Jarvis, M. J.; Mahatma, V. H.; R\öttgering, H. J. A.; Smith, D. J. B.; Wo\łowska, A.; Bondi, M.; Brienza, M.; Brown, M. J. I.; Br\üggen, M.; Chambers, K.; Garrett, M. A.; G\ürkan, G.; Huber, M.; Kunert-Bajraszewska, M.; Magnier, E.; Mingo, B.; Mostert, R.; Nikiel-Wroczy\\ński, B.; OŚullivan, S. P.; Paladino, R.; Ploeckinger, T.; Prandoni, I.; Rosenthal, M. J.; Schwarz, D. J.; Shulevski, A.; Wagenveld, J. D.; Wang, L. (2021-04-07)
      We present the source associations, cross-identifications, and multi-wavelength properties of the faint radio source population detected in the deep tier of the LOFAR Two Metre Sky Survey (LoTSS): the LoTSS Deep Fields. ...