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The LOFAR Two-metre Sky Survey (LoTSS) is a sensitive, high-resolution 120-168 MHz survey of the Northern sky. The LoTSS First Data Release (DR1) presents 424 square degrees of radio continuum observations over the HETDEX Spring Field…

In recent years the number of CubeSats (U-class spacecrafts) launched into space has increased exponentially marking the dawn of the nanosatellite technology. In general these satellites have a much smaller mass budget compared to…

The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this data…

Astrophysics of Galaxies · Physics 2018-11-21 T. W. Shimwell , C. Tasse , M. J. Hardcastle , A. P. Mechev , W. L. Williams , P. N. Best , H. J. A. Röttgering , J. R. Callingham , T. J. Dijkema , F. de Gasperin , D. N. Hoang , B. Hugo , M. Mirmont , J. B. R. Oonk , I. Prandoni , D. Rafferty , J. Sabater , O. Smirnov , R. J. van Weeren , G. J. White , M. Atemkeng , L. Bester , E. Bonnassieux , M. Brüggen , G. Brunetti , K. T. Chyży , R. Cochrane , J. E. Conway , J. H. Croston , A. Danezi , K. Duncan , M. Haverkorn , G. H. Heald , M. Iacobelli , H. T. Intema , N. Jackson , M. Jamrozy , M. J. Jarvis , R. Lakhoo , M. Mevius , G. K. Miley , L. Morabito , R. Morganti , D. Nisbet , E. Orrú , S. Perkins , R. F. Pizzo , C. Schrijvers , D. J. B. Smith , R. Vermeulen , M. W. Wise , L. Alegre , D. J. Bacon , I. M. van Bemmel , R. J. Beswick , A. Bonafede , A. Botteon , S. Bourke , M. Brienza , G. Calistro Rivera , R. Cassano , A. O. Clarke , C. J. Conselice , R. J. Dettmar , A. Drabent , C. Dumba , K. L. Emig , T. A. Enßlin , C. Ferrari , M. A. Garrett , R. T. Génova-Santos , A. Goyal , G. Gürkan , C. Hale , J. J. Harwood , V. Heesen , M. Hoeft , C. Horellou , C. Jackson , G. Kokotanekov , R. Kondapally , M. Kunert-Bajraszewska , V. Mahatma , E. K. Mahony , S. Mandal , J. P. McKean , A. Merloni , B. Mingo , A. Miskolczi , S. Mooney , B. Nikiel-Wroczyński , S. P. O'Sullivan , J. Quinn , W. Reich , C. Roskowiński , A. Rowlinson , F. Savini , A. Saxena , D. J. Schwarz , A. Shulevski , S. S. Sridhar , H. R. Stacey , S. Urquhart , M. H. D. van der Wiel , E. Varenius , B. Webster , A. Wilber

We have carried out a dedicated transient survey of 300 deg$^2$ of the SDSS Stripe 82 region using the Giant Meterwavelength Radio Telescope (GMRT) at 150 MHz. Our multi-epoch observations, together with the TGSS survey, allow us to probe…

Instrumentation and Methods for Astrophysics · Physics 2019-10-24 A. Hajela , K. P. Mooley , H. T. Intema , D. A. Frail

The LOFAR Two-metre Sky Survey (LoTSS) will cover the full northern sky and, additionally, aims to observe the LoTSS deep fields to a noise level of ~10 microJy/bm over several tens of square degrees in areas that have the most extensive…

The UKIRT Infrared Deep Sky Survey is a set of five surveys of complementary combinations of area, depth, and Galactic latitude, which began in 2005 May. The surveys use the UKIRT Wide Field Camera (WFCAM), which has a solid angle of…

Astrophysics · Physics 2010-04-06 Paul C. Hewett , Stephen J. Warren , Sandy K. Leggett , Simon T. Hodgkin

We present a study of weak lensing shear measurements for simulated galaxy images at radio wavelengths. We construct a simulation pipeline into which we can input galaxy images of known ellipticity, and with which we then simulate…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 Prina Patel , Filipe B. Abdalla , David J. Bacon , Barnaby Rowe , Oleg Smirnov , Rob J. Beswick

We present a model for the full-sky diffuse Galactic synchrotron spectral index with an appropriate level of spatial structure for a resolution of 56 arcmin (to match the resolution of the Haslam 408 MHz data). Observational data at 408 MHz…

Instrumentation and Methods for Astrophysics · Physics 2023-03-08 M. O. Irfan

The radio spectral index is a powerful probe for classifying cosmic radio sources and understanding the origin of the radio emission. Combining data at 147 MHz and 1.4 GHz from the TIFR GMRT Sky Survey (TGSS) and the NRAO VLA Sky Survey…

Instrumentation and Methods for Astrophysics · Physics 2018-01-10 F. de Gasperin , H. T. Intema , D. A. Frail

We present six nearly full-sky maps made from data taken by radiometers on the Juno satellite during its 5-year flight to Jupiter. The maps represent integrated emission over $\sim 4\%$ passbands spaced approximately in octaves between 600…

Instrumentation and Methods for Astrophysics · Physics 2025-03-31 Christopher Anderson , Philippe Berger , Tzu-Ching Chang , Olivier Doré , Shannon Brown , Steve Levin , Michael Seiffert

We present a description of the Dragonfly Wide Field Survey (DWFS), a deep photometric survey of a wide area of sky. The DWFS covers 330 $\mathrm{deg}^2$ in the equatorial GAMA fields and the Stripe 82 fields in the SDSS $g$ and $r$ bands.…

We present observations of quiet-sun small-scale structures (SSS) in the microwave range with the {\it Radio Astronomical Telescope of the Academy of Sciences 600} (RATAN-600) spectral-polarization facility in a wide range of frequencies.…

Solar and Stellar Astrophysics · Physics 2014-04-01 V. M. Bogod , C. E. Alissandrakis , T. I. Kaltman , S. Kh. Tokhchukova

We present the third data release of the LOFAR Two-metre Sky Survey (LoTSS-DR3). The survey images cover 88% of the northern sky and were created from 12,950 hrs of data (18.6 PB) accumulated over 10.5 years. The images were produced…

Astrophysics of Galaxies · Physics 2026-02-19 T. W. Shimwell , M. J. Hardcastle , C. Tasse , A. Drabent , A. Botteon , W. L. Williams , P. N. Best , H. J. A. Röttgering , M. Brüggen , G. Brunetti , J. R. Callingham , K. T. Chyży , J. E. Conway , F. De Gasperin , M. Haverkorn , C. Horellou , N. Jackson , G. K. Miley , L. K. Morabito , R. Morganti , S. P. O'Sullivan , D. J. Schwarz , D. J. B. Smith , R. J. van Weeren , H. K. Vedantham , G. J. White , A. Ahmadi , L. Alegre , M. Arias , B. Asabere , B. Bahr-Kalus , B. Barkus , M. Bilicki , L. Böhme , M. Brentjens , M. Brienza , D. J. Bomans , A. Bonafede , M. Bonato , E. Bonnassieux , J. M. Boxelaar , S. Camera , R. Cassano , J. Chilufya , M. Cianfaglione , J. H. Croston , V. Cuciti , P. Dabhade , E. De Rubeis , J. M. G. H. J. de Jong , D. Dallacasa , R. J. Dettmar , K. J. Duncan , G. Di Gennaro , H. W. Edler , C. Groeneveld , G. Gürkan , M. Hajduk , C. L. Hale , V. Heesen , D. N. Hoang , M. Hoeft , H. Holties , M. A. Horton , M. Iacobelli , M. Jamrozy , M. J. Jarvis , V. Jelic , M. Kadler , R. Kondapally , M. Kunert-Bajraszewska , M. Loose , M. Magliocchetti , K. Małek , C. Manzano , J. P. McKean , M. Mevius , B. Mingo , A. Miskolczi , A. Misra , J. Moldón , D. G. Nair , S. J. Nakoneczny , E. Orru , M. Pashapour-Ahmadabadi , T. Pasini , J. Petley , J. C. S. Pierce , I. Prandoni , D. Rafferty , K. Rajpurohit , C. J. Riseley , I. D. Roberts , S. Sethi , A. Shulevski , M. Stein , C. Stuardi , F. Sweijen , S. ter Veen , R. Timmerman , M. Vaccari , S. Wijnholds

We present the first full release of a survey of the 150 MHz radio sky, observed with the Giant Metrewave Radio Telescope between April 2010 and March 2012 as part of the TGSS project. Aimed at producing a reliable compact source survey,…

Cosmology and Nongalactic Astrophysics · Physics 2017-02-08 H. T. Intema , P. Jagannathan , K. P. Mooley , D. A. Frail

Running Median Subtraction Filter (RMSF) is a robust statistical tool for removing slowly varying baselines in data streams containing transients (short-duration signals) of interest. In this work, we explore the RMSF performance and…

Instrumentation and Methods for Astrophysics · Physics 2025-05-07 Arko P. Sen , Andrey Sarantsev , Geoffrey Blewitt , Andrei Derevianko

When planning a survey for astronomical transients, many factors such as cadence, filter choice, sky coverage, and depth of observations need to be balanced in order to optimize the scientific gain of the survey. Here we present a software…

Instrumentation and Methods for Astrophysics · Physics 2019-10-09 Ulrich Feindt , Jakob Nordin , Mickael Rigault , Valéry Brinnel , Suhail Dhawan , Ariel Goobar , Marek Kowalski

We present spectroscopic and eleven-band photometric redshifts for galaxies in the 100-uJy Subaru/XMM-Newton Deep Field radio source sample. We find good agreement between our redshift distribution and that predicted by the SKA Simulated…

In this work we study in details the influence of pure astronomical refraction on solar metrologic measurements made from ground-based full disk imagery and provide the tools for correcting the measurements and estimating the associated…

Solar and Stellar Astrophysics · Physics 2018-12-21 T. Corbard , R. Ikhlef , F. Morand , M. Meftah , C. Renaud

We present WSRT 1.38 GHz observations of the Hubble Deep Field (and flanking fields). 72 hours of data were combined to produce the WSRT's deepest image yet, achieving an r.m.s. noise level of 8 microJy per beam. We detect radio emission…

Astrophysics · Physics 2007-05-23 M. A. Garrett , G. de Bruyn , W. Baan , R. T. Schilizzi

This paper aims at providing a comprehensive framework to generate an astrophysical scene and to simulate realistic hyperspectral and multispectral data acquired by two JWST instruments, namely NIRCam Imager and NIRSpec IFU. We want to show…

Instrumentation and Methods for Astrophysics · Physics 2020-06-24 Claire Guilloteau , Thomas Oberlin , Olivier Berné , Nicolas Dobigeon