Related papers: Systematic effects in LOFAR data: A unified calibr…

Planck 2018 results. III. High Frequency Instrument data processing and frequency maps

This paper presents the High Frequency Instrument (HFI) data processing procedures for the Planck 2018 release. Major improvements in mapmaking have been achieved since the previous 2015 release. They enabled the first significant…

Cosmology and Nongalactic Astrophysics · Physics 2020-09-30 Planck Collaboration , N. Aghanim , Y. Akrami , M. Ashdown , J. Aumont , C. Baccigalupi , M. Ballardini , A. J. Banday , R. B. Barreiro , N. Bartolo , S. Basak , K. Benabed , J. -P. Bernard , M. Bersanelli , P. Bielewicz , J. R. Bond , J. Borrill , F. R. Bouchet , F. Boulanger , M. Bucher , C. Burigana , E. Calabrese , J. -F. Cardoso , J. Carron , A. Challinor , H. C. Chiang , L. P. L. Colombo , C. Combet , F. Couchot , B. P. Crill , F. Cuttaia , P. de Bernardis , A. de Rosa , G. de Zotti , J. Delabrouille , J. -M. Delouis , E. Di Valentino , J. M. Diego , O. Doré , M. Douspis , A. Ducout , X. Dupac , G. Efstathiou , F. Elsner , T. A. Enßlin , H. K. Eriksen , E. Falgarone , Y. Fantaye , F. Finelli , M. Frailis , A. A. Fraisse , E. Franceschi , A. Frolov , S. Galeotta , S. Galli , K. Ganga , R. T. Génova-Santos , M. Gerbino , T. Ghosh , J. González-Nuevo , K. M. Górski , S. Gratton , A. Gruppuso , J. E. Gudmundsson , W. Handley , F. K. Hansen , S. Henrot-Versillé , D. Herranz , E. Hivon , Z. Huang , A. H. Jaffe , W. C. Jones , A. Karakci , E. Keihänen , R. Keskitalo , K. Kiiveri , J. Kim , T. S. Kisner , N. Krachmalnicoff , M. Kunz , H. Kurki-Suonio , G. Lagache , J. -M. Lamarre , A. Lasenby , M. Lattanzi , C. R. Lawrence , F. Levrier , M. Liguori , P. B. Lilje , V. Lindholm , M. López-Caniego , Y. -Z. Ma , J. F. Macías-Pérez , G. Maggio , D. Maino , N. Mandolesi , A. Mangilli , P. G. Martin , E. Martínez-González , S. Matarrese , N. Mauri , J. D. McEwen , A. Melchiorri , A. Mennella , M. Migliaccio , M. -A. Miville-Deschênes , D. Molinari , A. Moneti , L. Montier , G. Morgante , A. Moss , S. Mottet , P. Natoli , L. Pagano , D. Paoletti , B. Partridge , G. Patanchon , L. Patrizii , O. Perdereau , F. Perrotta , V. Pettorino , F. Piacentini , J. -L. Puget , J. P. Rachen , M. Reinecke , M. Remazeilles , A. Renzi , G. Rocha , G. Roudier , L. Salvati , M. Sandri , M. Savelainen , D. Scott , C. Sirignano , G. Sirri , L. D. Spencer , R. Sunyaev , A. -S. Suur-Uski , J. A. Tauber , D. Tavagnacco , M. Tenti , L. Toffolatti , M. Tomasi , M. Tristram , T. Trombetti , J. Valiviita , F. Vansyngel , B. Van Tent , L. Vibert , P. Vielva , F. Villa , N. Vittorio , B. D. Wandelt , I. K. Wehus , A. Zonca

LBCS: the LOFAR Long-Baseline Calibrator Survey

(abridged). We outline LBCS (the LOFAR Long-Baseline Calibrator Survey), whose aim is to identify sources suitable for calibrating the highest-resolution observations made with the International LOFAR Telescope, which include baselines…

Instrumentation and Methods for Astrophysics · Physics 2016-11-03 N. Jackson , A. Tagore , A. Deller , J. Moldón , E. Varenius , L. Morabito , O. Wucknitz , T. Carozzi , J. Conway , A. Drabent , A. Kapinska , E. Orrù , M. Brentjens , R. Blaauw , G. Kuper , J. Sluman , J. Schaap , N. Vermaas , M. Iacobelli , L. Cerrigone , A. Shulevski , S. ter Veen , R. Fallows , R. Pizzo , M. Sipior , J. Anderson , M. Avruch , M. Bell , I. van Bemmel , M. Bentum , P. Best , A. Bonafede , F. Breitling , J. Broderick , W. Brouw , M. Brüggen , B. Ciardi , A. Corstanje , F. de Gasperin , E. de Geus , J. Eislöffel , D. Engels , H. Falcke , M. Garrett , J. Griessmeier , A. Gunst , M. van Haarlem , G. Heald , M. Hoeft , J. Hörandel , A. Horneffer , H. Intema , E. Juette , M. Kuniyoshi , J. van Leeuwen , G. Loose , P. Maat , R. McFadden , D. McKay-Bukowski , J. McKean , D. Mulcahy , H. Munk , M. Pandey-Pommier , A. Polatidis , W. Reich , H. Röttgering , A. Rowlinson , A. Scaife , D. Schwarz , M. Steinmetz , J. Swinbank , S. Thoudam , M. Toribio , R. Vermeulen , C. Vocks , R. van Weeren , M. Wise , S. Yatawatta , P. Zarka

On the patchiness of the individual pulse spectra at the very low radio frequencies

We have used sensitive LOw Frequency ARray (LOFAR) observations of PSR B0809+74 at 15--62 MHz to study the anomalously intensive pulses, first reported by Ulyanov et al. (2006) at 18--30MHz. Similarly to Ulyanov et al., we found that the…

High Energy Astrophysical Phenomena · Physics 2018-08-22 X. Song , V. I. Kondratiev , A. V. Bilous

New methods to constrain the radio transient rate: results from a survey of four fields with LOFAR

We report on the results of a search for radio transients between 115 and 190\,MHz with the LOw-Frequency ARray (LOFAR). Four fields have been monitored with cadences between 15 minutes and several months. A total of 151 images were…

Instrumentation and Methods for Astrophysics · Physics 2016-03-22 D. Carbone , A. J. van der Horst , R. A. M. J. Wijers , J. D. Swinbank , A. Rowlinson , J. W. Broderick , Y. N. Cendes , A. J. Stewart , M. E. Bell , R. P. Breton , S. Corbel , J. Eislöffel , R. P. Fender , J. M. Grießmeier , J. W. T. Hessels , P. G. Jonker , M. Kramer , C. J. Law , J. C. A. Miller-Jones , M. Pietka , L. H. A. Scheers , B. W. Stappers , J. van Leeuwen , R. Wijnands , M. Wise , P. Zarka

LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B

FRB 20180916B is a well-studied repeating fast radio burst source. Its proximity (~150 Mpc), along with detailed studies of the bursts, have revealed many clues about its nature -- including a 16.3-day periodicity in its activity. Here we…

High Energy Astrophysical Phenomena · Physics 2021-04-21 Z. Pleunis , D. Michilli , C. G. Bassa , J. W. T. Hessels , A. Naidu , B. C. Andersen , P. Chawla , E. Fonseca , A. Gopinath , V. M. Kaspi , V. I. Kondratiev , D. Z. Li , M. Bhardwaj , P. J. Boyle , C. Brar , T. Cassanelli , Y. Gupta , A. Josephy , R. Karuppusamy , A. Keimpema , F. Kirsten , C. Leung , B. Marcote , K. Masui , R. Mckinven , B. W. Meyers , C. Ng , K. Nimmo , Z. Paragi , M. Rahman , P. Scholz , K. Shin , K. M. Smith , I. H. Stairs , S. P. Tendulkar

Optimum estimate of delays and dispersive effects in low-frequency interferometric observations

Modern radio interferometers sensitive to low frequencies will make use of wide-band detectors. For such wide bandwidths, dispersive atmospheric effects introduce variations in the fringe delay which change through the band of the…

Instrumentation and Methods for Astrophysics · Physics 2011-01-25 I. Marti-Vidal

Calibrating the absolute amplitude scale for air showers measured at LOFAR

Air showers induced by cosmic rays create nanosecond pulses detectable at radio frequencies. These pulses have been measured successfully in the past few years at the LOw Frequency ARray (LOFAR) and are used to study the properties of…

Instrumentation and Methods for Astrophysics · Physics 2015-12-29 A. Nelles , J. R. Hörandel , T. Karskens , M. Krause , S. Buitink , A. Corstanje , J. E. Enriquez , M. Erdmann , H. Falcke , A. Haungs , R. Hiller , T. Huege , R. Krause , K. Link , M. J. Norden , J. P. Rachen , L. Rossetto , P. Schellart , O. Scholten , F. G. Schröder , S. ter Veen , S. Thoudam , T. N. G. Trinh , K. Weidenhaupt , S. J. Wijnholds , J. Anderson , L. Bähren , M. E. Bell , M. J. Bentum , P. Best , A. Bonafede , J. Bregman , W. N. Brouw , M. Bruüggen , H. R. Butcher , D. Carbone , B. Ciardi , F. de Gasperin , S. Duscha , J. Eislöffel , R. A. Fallows , W. Frieswijk , M. A. Garrett , M. P. van Haarlem , G. Heald , M. Hoeft , A. Horneffer , M. Iacobelli , E. Juette , A. Karastergiou , J. Kohler , V. I. Kondratiev , M. Kuniyoshi , G. Kuper , J. van Leeuwen , P. Maat , R. McFadden , D. McKay-Bukowski , E. Orru , H. Paas , M. Pandey-Pommier , V. N. Pandey , R. Pizzo , A. G. Polatidis , W. Reich , H. Röttgering , D. Schwarz , M. Serylak , J. Sluman , O. Smirnov , C. Tasse , M. C. Toribio , R. Vermeulen , R. J. van Weeren , R. A. M. J. Wijers , O. Wucknitz , P. Zarka

Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3-D Galactic halo magnetic field

We determined Faraday rotation measures (RMs) towards 137 pulsars in the northern sky, using Low-Frequency Array (LOFAR) observations at 110-190 MHz. This low-frequency RM catalogue, the largest to date, improves the precision of existing…

Astrophysics of Galaxies · Physics 2019-01-24 C. Sobey , A. V. Bilous , J-M. Grießmeier , J. W. T. Hessels , A. Karastergiou , E. F. Keane , V. I. Kondratiev , M. Kramer , D. Michilli , A. Noutsos , M. Pilia , E. J. Polzin , B. W. Stappers , C. M. Tan , J. van Leeuwen , J. P. W. Verbiest , P. Weltevrede , G. Heald , M. I. R. Alves , E. Carretti , T. Enßlin , M. Haverkorn , M. Iacobelli , W. Reich , C. Van Eck

Planck-LFI radiometers' spectral response

The Low Frequency Instrument (LFI) is an array of pseudo-correlation radiometers on board the Planck satellite, the ESA mission dedicated to precision measurements of the Cosmic Microwave Background. The LFI covers three bands centred at…

Instrumentation and Methods for Astrophysics · Physics 2010-01-27 A Zonca , C Franceschet , P Battaglia , F Villa , A Mennella , O D'Arcangelo , R Silvestri , M Bersanelli , E Artal , R C Butler , F Cuttaia , R J Davis , S Galeotta , N Hughes , P Jukkala , V-H Kilpia , M Laaninen , N Mandolesi , M Maris , L Mendes , M Sandri , L Terenzi , J Tuovinen , J Varis , A Wilkinson

LOFAR constraints on the repetition & environments of CHIME FRBs

The behaviour of fast radio bursts (FRBs) at radio frequencies <400 MHz is not well understood due to very few detections, with only two known sources detected below 300 MHz. Characterising low-frequency emission of FRBs is vital for…

High Energy Astrophysical Phenomena · Physics 2025-12-03 Pragya Chawla , Akshatha Gopinath , Ninisha Manaswini , Cees Bassa , Jason Hessels , Vlad Kondratiev , Daniele Michilli , Ziggy Pleunis

Prospects for radio weak lensing: studies using LOFAR observations in the ELAIS-N1 field

We carry out a shape and weak lensing analysis of Low Frequency Array (LOFAR) radio sources and Hyper Suprime-Cam (HSC) optical sources within the European Large Area Infrared Space Observatory Survey-North 1 (ELAIS-N1) field. Using HSC…

Cosmology and Nongalactic Astrophysics · Physics 2025-08-27 Jinyi Liu , Reinout van Weeren , Huub Rottgering , Konrad Kuijken

Cosmic ray detection with the LOFAR radio telescope

The LOw Frequency ARray (LOFAR) has successfully measured cosmic rays for over a decade now. With its dense core of antenna fields in the Netherlands, it is an ideal tool for studying the radio emission from extensive air showers in the…

High Energy Astrophysical Phenomena · Physics 2024-10-11 K. Terveer , S. Bouma , S. Buitink , A. Corstanje , M. Desmet , H. Falcke , B. M. Hare , J. R. Hörandel , T. Huege , N. Karastathis , P. Laub , K. Mulrey , A. Nelles , O. Scholten , P. Turekova , S. Thoudam , G. Trinh , S. ter Veen

LOFAR: Recent imaging results & future prospects

The Low Frequency Array (LOFAR) is under construction in the Netherlands and in several surrounding European countries. In this contribution, we describe the layout and design of the telescope, with a particular emphasis on the imaging…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 George Heald , Michael R. Bell , Andreas Horneffer , André R. Offringa , Roberto Pizzo , Sebastiaan van der Tol , Reinout J. van Weeren , Joris E. van Zwieten , James M. Anderson , Rainer Beck , Ilse van Bemmel , Laura Bîrzan , Annalisa Bonafede , John Conway , Chiara Ferrari , Francesco De Gasperin , Marijke Haverkorn , Neal Jackson , Giulia Macario , John McKean , Halime Miraghaei , Emanuela Orrù , David Rafferty , Huub Röttgering , Anna Scaife , Aleksandar Shulevski , Carlos Sotomayor , Cyril Tasse , Monica Trasatti , Olaf Wucknitz

A numerical study of 21-cm signal suppression and noise increase in direction-dependent calibration of LOFAR data

We investigate systematic effects in direction dependent gain calibration in the context of the Low-Frequency Array (LOFAR) 21-cm Epoch of Reionization (EoR) experiment. The LOFAR EoR Key Science Project aims to detect the 21-cm signal of…

Cosmology and Nongalactic Astrophysics · Physics 2021-11-12 M. Mevius , F. Mertens , L. V. E. Koopmans , A. R. Offringa , S. Yatawatta , M. A. Brentjens , E. Chapman , B. Ciardi , H. Gan , B. K. Gehlot , R. Ghara , A. Ghosh , S. K. Giri , I. T. Iliev , G. Mellema , V. N. Pandey , S. Zaroubi

Planck 2015 results. III. LFI systematic uncertainties

We present the current accounting of systematic effect uncertainties for the Low Frequency Instrument (LFI) that are relevant to the 2015 release of the Planck cosmological results, showing the robustness and consistency of our data set,…

Cosmology and Nongalactic Astrophysics · Physics 2016-09-28 Planck Collaboration , P. A. R. Ade , J. Aumont , C. Baccigalupi , A. J. Banday , R. B. Barreiro , N. Bartolo , S. Basak , P. Battaglia , E. Battaner , K. Benabed , A. Benoit-Lévy , J. -P. Bernard , M. Bersanelli , P. Bielewicz , A. Bonaldi , L. Bonavera , J. R. Bond , J. Borrill , C. Burigana , R. C. Butler , E. Calabrese , A. Catalano , P. R. Christensen , L. P. L. Colombo , M. Cruz , A. Curto , F. Cuttaia , L. Danese , R. D. Davies , R. J. Davis , P. de Bernardis , A. de Rosa , G. de Zotti , J. Delabrouille , C. Dickinson , J. M. Diego , O. Doré , A. Ducout , X. Dupac , F. Elsner , T. A. Enßlin , H. K. Eriksen , F. Finelli , M. Frailis , C. Franceschet , E. Franceschi , S. Galeotta , S. Galli , K. Ganga , T. Ghosh , M. Giard , Y. Giraud-Héraud , E. Gjerløw , J. González-Nuevo , K. M. Górski , A. Gregorio , A. Gruppuso , F. K. Hansen , D. L. Harrison , C. Hernández-Monteagudo , D. Herranz , S. R. Hildebrandt , E. Hivon , M. Hobson , A. Hornstrup , W. Hovest , K. M. Huffenberger , G. Hurier , A. H. Jaffe , T. R. Jaffe , E. Keihäen , R. Keskitalo , K. Kiiveri , T. S. Kisner , J. Knoche , N. Krachmalnicoff , M. Kunz , H. Kurki-Suonio , G. Lagache , J. -M. Lamarre , M. Lattanzi , C. R. Lawrence , J. P. Leahy , R. Leonardi , F. Levrier , P. B. Lilje , M. Linden-Vørnle , V. Lindholm , M. López-Caniego , P. M. Lubin , J. F. Macías-Pérez , B. Maffei , G. Maggio , D. Maino , N. Mandolesi , A. Mangilli , M. Maris , P. G. Martin , E. Martínez-González , S. Masi , S. Matarrese , P. R. Meinhold , A. Mennella , M. Migliaccio , S. Mitra , L. Montier , G. Morgante , D. Mortlock , D. Munshi , J. A. Murphy , F. Nati , P. Natoli , F. Noviello , F. Paci , L. Pagano , F. Pajot , D. Paoletti , B. Partridge , F. Pasian , T. J. Pearson , O. Perdereau , V. Pettorino , F. Piacentini , E. Pointecouteau , G. Polenta , G. W. Pratt , J. -L. Puget , J. P. Rachen , M. Reinecke , M. Remazeilles , A. Renzi , I. Ristorcelli , G. Rocha , C. Rosset , M. Rossetti , G. Roudier , J. A. Rubiño-Martín , B. Rusholme , M. Sandri , D. Santos , M. Savelainen , D. Scott , V. Stolyarov , R. Stompor , A. -S. Suur-Uski , J. -F. Sygnet , J. A. Tauber , D. Tavagnacco , L. Terenzi , L. Toffolatti , M. Tomasi , M. Tristram , M. Tucci , G. Umana , L. Valenziano , J. Valiviita , B. Van Tent , T. Vassallo , P. Vielva , F. Villa , L. A. Wade , B. D. Wandelt , R. Watson , I. K. Wehus , D. Yvon , A. Zacchei , J. P. Zibin , A. Zonca

Multi-dimensional optimisation of the scanning strategy for the LiteBIRD space mission

Large angular scale surveys in the absence of atmosphere are essential for measuring the primordial $B$-mode power spectrum of the Cosmic Microwave Background (CMB). Since this proposed measurement is about three to four orders of magnitude…

Instrumentation and Methods for Astrophysics · Physics 2025-03-05 Y. Takase , L. Vacher , H. Ishino , G. Patanchon , L. Montier , S. L. Stever , K. Ishizaka , Y. Nagano , W. Wang , J. Aumont , K. Aizawa , A. Anand , C. Baccigalupi , M. Ballardini , A. J. Banday , R. B. Barreiro , N. Bartolo , S. Basak , M. Bersanelli , M. Bortolami , T. Brinckmann , E. Calabrese , P. Campeti , E. Carinos , A. Carones , F. J. Casas , K. Cheung , L. Clermont , F. Columbro , A. Coppolecchia , F. Cuttaia , P. de Bernardis , T. de Haan , E. de la Hoz , S. Della Torre , P. Diego-Palazuelos , G. D'Alessandro , H. K. Eriksen , J. Errard , F. Finelli , U. Fuskeland , G. Galloni , M. Galloway , M. Gervasi , T. Ghigna , S. Giardiello , C. Gimeno-Amo , E. Gjerløw , R. González González , A. Gruppuso , M. Hazumi , S. Henrot-Versillé , L. T. Hergt , K. Ikuma , K. Kohri , L. Lamagna , M. Lattanzi , C. Leloup , M. Lembo , F. Levrier , A. I. Lonappan , M. López-Caniego , G. Luzzi , B. Maffei , E. Martínez-González , S. Masi , S. Matarrese , F. T. Matsuda , T. Matsumura , S. Micheli , M. Migliaccio , M. Monelli , G. Morgante , B. Mot , R. Nagata , T. Namikawa , A. Novelli , K. Odagiri , S. Oguri , R. Omae , L. Pagano , D. Paoletti , F. Piacentini , M. Pinchera , G. Polenta , L. Porcelli , N. Raffuzzi , M. Remazeilles , A. Ritacco , M. Ruiz-Granda , Y. Sakurai , D. Scott , Y. Sekimoto , M. Shiraishi , G. Signorelli , R. M. Sullivan , H. Takakura , L. Terenzi , M. Tomasi , M. Tristram , B. van Tent , P. Vielva , I. K. Wehus , B. Westbrook , G. Weymann-Despres , E. J. Wollack , M. Zannoni , Y. Zhou

Characterization of systematic error in Advanced LIGO calibration

The raw outputs of the detectors within the Advanced Laser Interferometer Gravitational-Wave Observatory need to be calibrated in order to produce the estimate of the dimensionless strain used for astrophysical analyses. The two detectors…

Instrumentation and Methods for Astrophysics · Physics 2020-09-03 Ling Sun , Evan Goetz , Jeffrey S. Kissel , Joseph Betzwieser , Sudarshan Karki , Aaron Viets , Madeline Wade , Dripta Bhattacharjee , Vladimir Bossilkov , Pep B. Covas , Laurence E. H. Datrier , Rachel Gray , Shivaraj Kandhasamy , Yannick K. Lecoeuche , Gregory Mendell , Timesh Mistry , Ethan Payne , Richard L. Savage , Alan J. Weinstein , Stuart Aston , Aaron Buikema , Craig Cahillane , Jenne C. Driggers , Sheila E. Dwyer , Rahul Kumar , Alexander Urban

Scalability Model for the LOFAR Direction Independent Pipeline

LOFAR is a leading aperture synthesis telescope operated in the Netherlands with stations across Europe. The LOFAR Two-meter Sky Survey (LoTSS) will produce more than 3000 14 TB data sets, mapping the entire northern sky at low frequencies.…

Instrumentation and Methods for Astrophysics · Physics 2019-06-28 A. P. Mechev , T. W. Shimwell , A. Plaat , H. Intema , A. L. Varbanescu , H. J. A Rottgering

Applying full polarization A-Projection to very wide field of view instruments: An imager for LOFAR

The aimed high sensitivities and large fields of view of the new generation of interferometers impose to reach high dynamic range of order $\sim$1:$10^6$ to 1:$10^8$ in the case of the Square Kilometer Array. The main problem is the…

Instrumentation and Methods for Astrophysics · Physics 2015-06-12 C. Tasse , B. van der Tol , J. van Zwieten , Ger van Diepen , S. Bhatnagar

Optimal Linear Image Combination

A simple, yet general, formalism for the optimized linear combination of astrophysical images is constructed and demonstrated. The formalism allows the user to combine multiple undersampled images to provide oversampled output at high…

Instrumentation and Methods for Astrophysics · Physics 2015-05-28 Barnaby Rowe , Christopher Hirata , Jason Rhodes