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The LOw Frequency ARray Two-metre Sky Survey second data release (LoTSS DR2) covers 27\% of the northern sky and contains around four million radio sources. The development of this catalogue involved a large citizen science project (Radio…

Astrophysics of Galaxies · Physics 2025-07-16 Maya Horton , Martin Hardcastle , George Miley , Cyril Tasse , Timothy Shimwell

New-generation radio telescopes like LOFAR are conducting extensive sky surveys, detecting millions of sources. To maximise the scientific value of these surveys, radio source components must be properly associated into physical sources…

We cross-correlated galaxies from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) second data release (DR2) radio source with the extended Baryon Oscillation Spectroscopic Survey (eBOSS) luminous red galaxy (LRG) sample to…

We present the final 6'' resolution data release of the ELAIS-N1 field from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey Deep Fields project (LoTSS Deep). The 144MHz images are the most sensitive achieved to date at this frequency…

We present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We use the second data release of the 144 MHz LOFAR Two-metre Sky Survey to produce circularly-polarised maps with…

With the advent of new generation low-frequency telescopes, such as the LOw Frequency ARray (LOFAR), and improved calibration techniques, we have now started to unveil the sub GHz radio sky with unprecedented depth and sensitivity. The…

We combine the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) second data release (DR2) catalogue with gravitational lensing maps from the Cosmic Microwave Background (CMB) to place constraints on the bias evolution of LoTSS radio…

Cosmology and Nongalactic Astrophysics · Physics 2024-05-17 S. J. Nakoneczny , D. Alonso , M. Bilicki , D. J. Schwarz , C. L. Hale , A. Pollo , C. Heneka , P. Tiwari , J. Zheng , M. Brüggen , M. J. Jarvis , T. W. Shimwell

Building the radio sky template are crucial for detecting the 21 cm emission line signal from the Epoch of Reionization (EoR), as well as for other cosmological research endeavors. Utilizing data from the LOFAR Two-meter Sky Survey (LoTSS)…

Astrophysics of Galaxies · Physics 2024-11-07 Jinyang Lin , Zhenghao Zhu , Renyi Ma , Anna Bonaldi , Huanyuan Shan

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

We present the second ROSAT all-sky survey source catalogue, hereafter referred to as the 2RXS catalogue. This is the second publicly released ROSAT catalogue of point-like sources obtained from the ROSAT all-sky survey (RASS) observations…

High Energy Astrophysical Phenomena · Physics 2016-09-30 Th. Boller , M. J. Freyberg , J. Truemper , F. Haberl , W. Voges , K. Nandra

Various studies have laid claim to finding an alignment of the polarization vectors or radio jets of active galactic nuclei (AGN) over large distances, but these results have proven controversial and so far, there is no clear explanation…

The next generation of radio surveys is going to be transformative for cosmology and other aspects of our understanding of astrophysics. Realistic simulations of radio observations are essential for the design and planning of radio surveys.…

Instrumentation and Methods for Astrophysics · Physics 2025-07-30 Tobias Vičánek Martínez , Henrik W. Edler , Marcus Brüggen

The third data release of the LOFAR Two-metre Sky Survey provides an unprecedented view of the northern sky at 144 MHz. While compact sources can be efficiently identified with automated software packages, the detection of diffuse radio…

A Faraday rotation measure (RM) catalogue, or RM Grid, is a valuable resource for the study of cosmic magnetism. Using the second data release (DR2) from the LOFAR Two-metre Sky Survey (LoTSS), we have produced a catalogue of 2461…

We have conducted a deep survey (with a central rms of $55\mu\textrm{Jy}$) with the LOw Frequency ARray (LOFAR) at 120-168 MHz of the Bo\"otes field, with an angular resolution of $3.98^{''}\times6.45^{''}$, and obtained a sample of 10091…

The FIRST (Faint Images of the Radio Sky at Twenty Centimeters) survey now covers 1550 square degrees of sky where $07^{h}16 < \alpha < 17^{h}40$ and $28^{\circ}.3 < \delta < 42^{\circ}$. This yields a catalog of 138,665 sources above the…

Astrophysics · Physics 2009-10-28 C. M. Cress , D. J. Helfand , R. H. Becker , M. D. Gregg , R. L. White

Radio loud active galactic nuclei (RLAGNs) are often morphologically complex objects that can consist of multiple, spatially separated, components. Astronomers often rely on visual inspection to resolve radio component association. However,…

Extended radio sources in the sky require a dense sampling of short baselines to be properly imaged by interferometers. This problem arises in many areas of radio astronomy, such as in the study of galaxy clusters, which may host Mpc-scale…

The presence of large-scale magnetic fields and ultra-relativistic electrons in the intra-cluster medium (ICM) is confirmed through the detection of diffuse radio synchrotron sources, so-called radio halos and relics. Due to their…