Related papers: Long baseline experiments with LOFAR

The LOFAR View of Cosmic Magnetism

The origin of magnetic fields in the Universe is an open problem in astrophysics and fundamental physics. Polarization observations with the forthcoming large radio telescopes will open a new era in the observation of magnetic fields and…

Instrumentation and Methods for Astrophysics · Physics 2015-06-12 Rainer Beck , James Anderson , George Heald , Andreas Horneffer , Marco Iacobelli , Jana Koehler , David Mulcahy , Roberto Pizzo , Anna Scaife , Olaf Wucknitz , the team of the LOFAR Magnetism Key Science Project

The Search for Binary Supermassive Black Holes Amongst Quasars with Offset Broad Lines Using the Very Long Baseline Array

In several previous studies, quasars exhibiting broad emission lines with >1000 km/s velocity offsets with respect to the host galaxy rest frame have been discovered. One leading hypothesis for the origin of these velocity-offset broad…

Astrophysics of Galaxies · Physics 2021-06-23 Peter Breiding , Sarah Burke-Spolaor , Michael Eracleous , Tamara Bogdanović , T. Joseph W. Lazio , Jessie Runnoe , Steinn Sigurdsson

A very brief description of LOFAR - the Low Frequency Array

LOFAR (Low Frequency Array) is an innovative radio telescope optimized for the frequency range 30-240 MHz. The telescope is realized as a phased aperture array without any moving parts. Digital beam forming allows the telescope to point to…

Astrophysics · Physics 2009-11-11 H. Falcke , M. P. van Haarlem , A. G. de Bruyn , R. Braun , H. J. A. Röttgering , B. Stappers , W. H. W. M. Boland , H. R. Butcher , E. J. de Geus , L. Koopmans , R. Fender , J. Kuijpers , G. K. Miley , R. T. Schilizzi , C. Vogt , R. A. M. J. Wijers , M. Wise , W. N. Brouw , J. P. Hamaker , J. E. Noordam , T. Oosterloo , L. Bähren , M. A. Brentjens , S. J. Wijnholds , J. D. Bregman , W. A. van Cappellen , A. W. Gunst , G. W. Kant , J. Reitsma , K. van der Schaaf , C. M. de Vos

LOFAR first look at the giant radio galaxy 3C 236

We have examined the giant radio galaxy 3C~236 using LOFAR at 143 MHz down to an angular resolution of 7", in combination with observations at higher frequencies. We have used the low frequency data to derive spectral index maps with the…

Astrophysics of Galaxies · Physics 2019-08-14 A. Shulevski , P. D. Barthel , R. Morganti , J. J. Harwood , M. Brienza , T. W. Shimwell , H. J. A. Röttgering , G. J. White , J. R. Callingham , S. Mooney , D. A. Rafferty

VLBI observations of jupiter with the initial test station of LOFAR and the nancay decametric array

AIMS: To demonstrate and test the capability of the next generation of low-frequency radio telescopes to perform high resolution observations across intra-continental baselines. Jupiter's strong burst emission is used to perform broadband…

Astrophysics · Physics 2008-09-17 A. Nigl , P. Zarka , J. Kuijpers , H. Falcke , L. Baehren , L. Denis

A Multi-Frequency Study of 3C309.1

Here we summarize our results from a detailed multi-frequency study of the QSO 3C309.1 based on the Very Long Baseline Array (VLBA) observations made in mid 1998. From our images, we find a curved jet extending up to 100 milliarcseconds…

Astrophysics · Physics 2007-05-23 E. Ros , A. P. Lobanov

First LOFAR Observations of Gamma-Ray Binaries

A few binary systems display High Energy (100 MeV - 100 GeV) and/or Very High Energy (> 100 GeV) gamma-ray emission. These systems also display non-thermal radio emission that can be resolved with long-baseline radio interferometers,…

High Energy Astrophysical Phenomena · Physics 2015-06-11 Benito Marcote , Marc Ribó , Josep M. Paredes , John Swinbank , Jess Broderick , Rob Fender , Sera Markoff , Ralf Wijers

Observations of 44 extragalactic radio sources with the VLBA at 92cm: A List of Potential Calibrators and Targets for LOFAR and RadioAstron

Aims. We have analysed VLBA 92cm archive data of 44 extragalactic sources in order to identify early targets and potential calibrator sources for the LOFAR radio telescope and the RadioAstron space VLBI mission. Some of these sources will…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 H. Rampadarath , M. A. Garrett , A. Polatidis

Lofar, E-Lofar and Low-Frequency Vlbi

The Low Frequency Array (LOFAR) is a new generation of electronic radio telescope based on aperture array technology. The telescope is being developed by ASTRON, and currently being rolled out across the Netherlands and other countries in…

Cosmology and Nongalactic Astrophysics · Physics 2009-03-07 M. A. Garrett , H. Rampadarath , E. Lenc , Olaf Wucknitz

Continuum surveys with LOFAR and synergy with future large surveys in the 1-2 GHz band

Radio astronomy is entering the era of large surveys. This paper describes the plans for wide surveys with the LOw Frequency ARray (LOFAR) and their synergy with large surveys at higher frequencies (in particular in the 1-2 GHz band) that…

Cosmology and Nongalactic Astrophysics · Physics 2010-01-15 R. Morganti , H. Rottgering , I. Snellen , G. Miley , P. Barthel , P. Best , M. Bruggen , G. Brunetti , K. Chyzy , J. Conway , M. Jarvis , M. Lehnert

An Overview of the 2014 ALMA Long Baseline Campaign

A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions of tens of milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up to ~15 km. To develop and test…

Instrumentation and Methods for Astrophysics · Physics 2016-09-30 ALMA Partnership , E. B. Fomalont , C. Vlahakis , S. Corder , A. Remijan , D. Barkats , R. Lucas , T. R. Hunter , C. L. Brogan , Y. Asaki , S. Matsushita , W. R. F. Dent , R. E. Hills , N. Phillips , A. M. S. Richards , P. Cox , R. Amestica , D. Broguiere , W. Cotton , A. S. Hales , R. Hiriart , A. Hirota , J. A. Hodge , C. M. V. Impellizzeri , J. Kern , R. Kneissl , E. Liuzzo , N. Marcelino , R. Marson , A. Mignano , K. Nakanishi , B. Nikolic , J. E. Perez , L. M. Pérez , I. Toledo , R. Aladro , B. Butler , J. Cortes , P. Cortes , V. Dhawan , J. Di Francesco , D. Espada , F. Galarza , D. Garcia-Appadoo , L. Guzman-Ramirez , E. M. Humphreys , T. Jung , S. Kameno , R. A. Laing , S. Leon , J. Mangum , G. Marconi , H. Nagai , L. -A. Nyman , M. Radiszcz , J. A. Rodón , T. Sawada , S. Takahashi , R. P. J. Tilanus , T. van Kempen , B. Vila Vilaro , L. C. Watson , T. Wiklind , F. Gueth , K. Tatematsu , A. Wootten , A. Castro-Carrizo , E. Chapillon , G. Dumas , I. de Gregorio-Monsalvo , H. Francke , J. Gallardo , J. Garcia , S. Gonzalez , J. E. Hibbard , T. Hill , T. Kaminski , A. Karim , M. Krips , Y. Kurono , C. Lopez , S. Martin , L. Maud , F. Morales , V. Pietu , K. Plarre , G. Schieven , L. Testi , L. Videla , E. Villard , N. Whyborn , M. A. Zwaan , F. Alves , P. Andreani , A. Avison , M. Barta , F. Bedosti , G. J. Bendo , F. Bertoldi , M. Bethermin , A. Biggs , J. Boissier , J. Brand , S. Burkutean , V. Casasola , J. Conway , L. Cortese , B. Dabrowski , T. A. Davis , M. Diaz Trigo , F. Fontani , R. Franco-Hernandez , G. Fuller , R. Galvan Madrid , A. Giannetti , A. Ginsburg , S. F. Graves , E. Hatziminaoglou , M. Hogerheijde , P. Jachym , I. Jimenez Serra , M. Karlicky , P. Klaasen , M. Kraus , D. Kunneriath , C. Lagos , S. Longmore , S. Leurini , M. Maercker , B. Magnelli , I. Marti Vidal , M. Massardi , A. Maury , S. Muehle , S. Muller , T. Muxlow , E. O'Gorman , R. Paladino , D. Petry , J. Pineda , S. Randall , J. S. Richer , A. Rossetti , A. Rushton , K. Rygl , A. Sanchez Monge , R. Schaaf , P. Schilke , T. Stanke , M. Schmalzl , F. Stoehr , S. Urban , E. van Kampen , W. Vlemmings , K. Wang , W. Wild , Y. Yang , S. Iguchi , T. Hasegawa , M. Saito , J. Inatani , N. Mizuno , S. Asayama , G. Kosugi , K. -I. Morita , K. Chiba , S. Kawashima , S. K. Okumura , N. Ohashi , R. Ogasawara , S. Sakamoto , T. Noguchi , Y. -D. Huang , S. -Y. Liu , F. Kemper , P. M. Koch , M. -T. Chen , Y. Chikada , M. Hiramatsu , D. Iono , M. Shimojo , S. Komugi , J. Kim , A. -R. Lyo , E. Muller , C. Herrera , R. E. Miura , J. Ueda , J. Chibueze , Y. -N. Su , A. Trejo-Cruz , K. -S. Wang , H. Kiuchi , N. Ukita , M. Sugimoto , R. Kawabe , M. Hayashi , S. Miyama , P. T. P. Ho , N. Kaifu , M. Ishiguro , A. J. Beasley , S. Bhatnagar , J. A. Braatz , D. G. Brisbin , N. Brunetti , C. Carilli , J. H. Crossley , L. D'Addario , J. L. Donovan Meyer , D. T. Emerson , A. S. Evans , P. Fisher , K. Golap , D. M. Griffith , A. E. Hale , D. Halstead , E. J. Hardy , M. C. Hatz , M. Holdaway , R. Indebetouw , P. R. Jewell , A. A. Kepley , D. -C. Kim , M. D. Lacy , A. K. Leroy , H. S. Liszt , C. J. Lonsdale , B. Matthews , M. McKinnon , B. S. Mason , G. Moellenbrock , A. Moullet , S. T. Myers , J. Ott , A. B. Peck , J. Pisano , S. J. E. Radford , W. T. Randolph , U. Rao Venkata , M. G. Rawlings , R. Rosen , S. L. Schnee , K. S. Scott , N. K. Sharp , K. Sheth , R. S. Simon , T. Tsutsumi , S. J. Wood

LOFAR imaging capabilities and system sensitivity

This document describes the general astronomical capabilities of the LOw Frequency ARray (LOFAR). The frequency range covered by LOFAR is split into two bands denoted as low band (LB, 10 - 80 MHz) and high band (HB, 120 - 240 MHz). LOFAR…

Instrumentation and Methods for Astrophysics · Physics 2013-08-23 R. J. Nijboer , M. Pandey-Pommier , A. G. de Bruyn

Radio views of cosmic reionization

We use numerical simulations of cosmic reionization and radiative processes related to the HI 21 cm emission line to produce synthetic radio maps as seen by next generation radio telescopes that will operate at low radio frequencies (e.g.…

Astrophysics · Physics 2009-11-11 M. Valdes , B. Ciardi , A. Ferrara , M. Johnston-Hollitt , H. Rottgering

The LOFAR Multifrequency Snapshot Sky Survey (MSSS) I. Survey description and first results

We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky LOFAR imaging survey. In this introductory paper, we first describe in detail the motivation and design of the survey. Compared to previous radio surveys, MSSS…

Instrumentation and Methods for Astrophysics · Physics 2015-11-04 G. H. Heald , R. F. Pizzo , E. Orrú , R. P. Breton , D. Carbone , C. Ferrari , M. J. Hardcastle , W. Jurusik , G. Macario , D. Mulcahy , D. Rafferty , A. Asgekar , M. Brentjens , R. A. Fallows , W. Frieswijk , M. C. Toribio , B. Adebahr , M. Arts , M. R. Bell , A. Bonafede , J. Bray , J. Broderick , T. Cantwell , P. Carroll , Y. Cendes , A. O. Clarke , J. Croston , S. Daiboo , F. de Gasperin , J. Gregson , J. Harwood , T. Hassall , V. Heesen , A. Horneffer , A. J. van der Horst , M. Iacobelli , V. Jelić , D. Jones , D. Kant , G. Kokotanekov , P. Martin , J. P. McKean , L. K. Morabito , B. Nikiel-Wroczyński , A. Offringa , V. N. Pandey , M. Pandey-Pommier , M. Pietka , L. Pratley , C. Riseley , A. Rowlinson , J. Sabater , A. M. M. Scaife , L. H. A. Scheers , K. Sendlinger , A. Shulevski , M. Sipior , C. Sobey , A. J. Stewart , A. Stroe , J. Swinbank , C. Tasse , J. Trüstedt , E. Varenius , S. van Velzen , N. Vilchez , R. J. van Weeren , S. Wijnholds , W. L. Williams , A. G. de Bruyn , R. Nijboer , M. Wise , A. Alexov , J. Anderson , I. M. Avruch , R. Beck , M. E. Bell , I. van Bemmel , M. J. Bentum , G. Bernardi , P. Best , F. Breitling , W. N. Brouw , M. Brüggen , H. R. Butcher , B. Ciardi , J. E. Conway , E. de Geus , A. de Jong , M. de Vos , A. Deller , R. J. Dettmar , S. Duscha , J. Eislöffel , D. Engels , H. Falcke , R. Fender , M. A. Garrett , J. Grießmeier , A. W. Gunst , J. P. Hamaker , J. W. T. Hessels , M. Hoeft , J. Hörandel , H. A. Holties , H. Intema , N. J. Jackson , E. Jütte , A. Karastergiou , W. F. A. Klijn , V. I. Kondratiev , L. V. E. Koopmans , M. Kuniyoshi , G. Kuper , C. Law , J. van Leeuwen , M. Loose , P. Maat , S. Markoff , R. McFadden , D. McKay-Bukowski , M. Mevius , J. C. A. Miller-Jones , R. Morganti , H. Munk , A. Nelles , J. E. Noordam , M. J. Norden , H. Paas , A. G. Polatidis , W. Reich , A. Renting , H. Röttgering , A. Schoenmakers , D. Schwarz , J. Sluman , O. Smirnov , B. W. Stappers , M. Steinmetz , M. Tagger , Y. Tang , S. ter Veen , S. Thoudam , R. Vermeulen , C. Vocks , C. Vogt , R. A. M. J. Wijers , O. Wucknitz , S. Yatawatta , P. Zarka

Multi-waveband Emission Maps of Blazars

We are leading a comprehensive multi-waveband monitoring program of 34 gamma-ray bright blazars designed to locate the emission regions of blazars from radio to gamma-ray frequencies. The "maps" are anchored by sequences of images in both…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Alan Marscher , Svetlana G. Jorstad , Valeri M. Larionov , Margo F. Aller , Anne Lahteenmaki

3C radio sources as they've never been seen before

Low-radio-frequency observations played a remarkable role in the early days of radio astronomy; however, in the subsequent three or four decades their usefulness has largely been in terms of the finding-frequency of surveys. Recent…

Astrophysics · Physics 2007-05-23 Katherine Blundell , Namir Kassim , Rick Perley

Low Frequency Two Meter Sky Survey Radial Artifacts Identified as BL Quasars

Through the use of a High Band Antenna system, the Low Frequency Array Two-Meter Sky Survey (LoTSS) is an attempt to complete a high-resolution survey of the northern celestial sky. To date, thousands of radio sources have been classified…

Astrophysics of Galaxies · Physics 2021-06-04 Antonio Paris

Detecting cosmic rays with the LOFAR radio telescope

The low frequency array (LOFAR), is the first radio telescope designed with the capability to measure radio emission from cosmic-ray induced air showers in parallel with interferometric observations. In the first $\sim 2\,\mathrm{years}$ of…

Instrumentation and Methods for Astrophysics · Physics 2014-06-27 P. Schellart , A. Nelles , S. Buitink , A. Corstanje , J. E. Enriquez , H. Falcke , W. Frieswijk , J. R. Hörandel , A. Horneffer , C. W. James , M. Krause , M. Mevius , O. Scholten , S. ter Veen , S. Thoudam , M. van den Akker , A. Alexov , J. Anderson , I. M. Avruch , L. Bähren , R. Beck , M. E. Bell , P. Bennema , M. J. Bentum , G. Bernardi , P. Best , J. Bregman , F. Breitling , M. Brentjens , J. Broderick , M. Brüggen , B. Ciardi , A. Coolen , F. de Gasperin , E. de Geus , A. de Jong , M. de Vos , S. Duscha , J. Eislöffel , R. A. Fallows , C. Ferrari , M. A. Garrett , J. Grießmeier , T. Grit , J. P. Hamaker , T. E. Hassall , G. Heald , J. W. T. Hessels , M. Hoeft , H. A. Holties , M. Iacobelli , E. Juette , A. Karastergiou , W. Klijn , J. Kohler , V. I. Kondratiev , M. Kramer , M. Kuniyoshi , G. Kuper , P. Maat , G. Macario , G. Mann , S. Markoff , D. McKay-Bukowski , J. P. McKean , J. C. A. Miller-Jones , J. D. Mol , D. D. Mulcahy , H. Munk , R. Nijboer , M. J. Norden , E. Orru , R. Overeem , H. Paas , M. Pandey-Pommier , R. Pizzo , A. G. Polatidis , A. Renting , J. W. Romein , H. Röttgering , A. Schoenmakers , D. Schwarz , J. Sluman , O. Smirnov , C. Sobey , B. W. Stappers , M. Steinmetz , J. Swinbank , Y. Tang , C. Tasse , C. Toribio , J. van Leeuwen , R. van Nieuwpoort , R. J. van Weeren , N. Vermaas , R. Vermeulen , C. Vocks , C. Vogt , R. A. M. J. Wijers , S. J. Wijnholds , M. W. Wise , O. Wucknitz , S. Yatawatta , P. Zarka , A. Zensus

LOFAR reveals the giant: a low-frequency radio continuum study of the outflow in the nearby FR I radio galaxy 3C 31

We present a deep, low-frequency radio continuum study of the nearby Fanaroff--Riley class I (FR I) radio galaxy 3C 31 using a combination of LOw Frequency ARray (LOFAR; 30--85 and 115--178 MHz), Very Large Array (VLA; 290--420 MHz),…

Astrophysics of Galaxies · Physics 2018-01-10 V. Heesen , J. H. Croston , R. Morganti , M. J. Hardcastle , A. J. Stewart , P. N. Best , J. W. Broderick , M. Brüggen , G. Brunetti , K. T. Chyży , J. J. Harwood , M. Haverkorn , K. M. Hess , H. T. Intema , M. Jamrozy , M. Kunert-Bajraszewska , J. P. McKean , E. Orrú , H. J. A. Röttgering , T. W. Shimwell , A. Shulevski , G. J. White , E. M. Wilcots , W. L. Williams

Sub-arcsecond imaging with the International LOFAR Telescope: II. Completion of the LOFAR Long-Baseline Calibrator Survey

The Low-Frequency Array (LOFAR) Long-Baseline Calibrator Survey (LBCS) was conducted between 2014 and 2019 in order to obtain a set of suitable calibrators for the LOFAR array. In this paper we present the complete survey, building on the…

Astrophysics of Galaxies · Physics 2022-01-26 Neal Jackson , Shruti Badole , John Morgan , Rajan Chhetri , Kaspars Prusis , Atvars Nikolajevs , Leah Morabito , Michiel Brentjens , Frits Sweijen , Marco Iacobelli , Emanuela Orrù , J. Sluman , R. Blaauw , H. Mulder , P. van Dijk , Sean Mooney , Adam Deller , Javier Moldon , J. R. Callingham , Jeremy Harwood , Martin Hardcastle , George Heald , Alexander Drabent , J. P. McKean , A. Asgekar , I. M. Avruch , M. J. Bentum , A. Bonafede , W. N. Brouw , M. Brüggen , H. R. Butcher , B. Ciardi , A. Coolen , A. Corstanje , S. Damstra , S. Duscha , J. Eislöffel , H. Falcke , M. Garrett , F. de Gasperin , J. -M. Griessmeier , A. W. Gunst , M. P. van Haarlem , M. Hoeft , A. J. van der Horst , E. Jütte , L. V. E. Koopmans , A. Krankowski , P. Maat , G. Mann , G. K. Miley , A. Nelles , M. Norden , M. Paas , V. N. Pandey , M. Pandey-Pommier , R. F. Pizzo , W. Reich , H. Rothkaehl , A. Rowlinson , M. Ruiter , A. Shulevski , D. J. Schwarz , O. Smirnov , M. Tagger , C. Vocks , R. J. van Weeren , R. Wijers , O. Wucknitz , P. Zarka , J. A. Zensus , P. Zucca