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Your search keyword '"Holties, H. A."' showing total 19 results
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19 results on '"Holties, H. A."'

1. Apertif 1.4 GHz continuum observations of the Bo\'otes field and their combined view with LOFAR

Author

Kutkin, A. M., Oosterloo, T. A., Morganti, R., Offringa, A. R., Adams, E. A. K., Adebahr, B., Dénes, H., Hess, K. M., van der Hulst, J. M., de Blok, W. J. G., Bozkurt, A., van Cappellen, W. A., Gunst, A. W., Holties, H. A., van Leeuwen, J., Loose, G. M., Oostrum, L. C., Vohl, D., Wijnholds, S. J., and Ziemke, J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present a new image of a 26.5 square degree region in the Bo\"otes constellation obtained at 1.4 GHz using the Aperture Tile in Focus (Apertif) system on the Westerbork Synthesis Radio Telescope. We use a newly developed processing pipeline which includes direction-dependent self-calibration which provides a significant improvement of the quality of the images compared to those released as part of the Apertif first data release. For the Bo\"otes region, we mosaic 187 Apertif images and extract a source catalog. The mosaic image has an angular resolution of 27${\times}$11.5 arcseconds and a median background noise of 40 ${\mu}$Jy/beam. The catalog has 8994 sources and is complete down to the 0.3 mJy level. We combine the Apertif image with LOFAR images of the Bo\"otes field at 54 and 150 MHz to study spectral properties of the sources. We find a spectral flattening towards low flux density sources. Using the spectral index limits from Apertif non-detections we derive that up to 9 percent of the sources have ultra-steep spectra with a slope steeper than -1.2. Steepening of the spectral index with increasing redshift is also seen in the data showing a different dependency for the low-frequency spectral index and the high frequency one. This can be explained by a population of sources having concave radio spectra with a turnover frequency around the LOFAR band. Additionally, we discuss cases of individual extended sources with an interesting resolved spectral structure. With the improved pipeline, we aim to continue processing data from the Apertif wide-area surveys and release the improved 1.4 GHz images of several famous fields., Comment: 13 pages, 9 figures; to be published in A&A

Published
2023
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2. First release of Apertif imaging survey data

Author

Adams, Elizabeth A. K., Adebahr, B., de Blok, W. J. G., Denes, H., Hess, K. M., van der Hulst, J. M., Kutkin, A., Lucero, D. M., Morganti, R., Moss, V. A., Oosterloo, T. A., Orru, E., Schulz, R., van Amesfoort, A. S., Berger, A., Boersma, O. M., Bouwhuis, M., Brink, R. van den, van Cappellen, W. A., Connor, L., Coolen, A. H. W. M., Damstra, S., van Diepen, G. N. J., Dijkema, T. J., Ebbendorf, N., Grange, Y. G., de Goei, R., Gunst, A. W., Holties, H. A., Hut, B., Ivashina, M. V., Jozsa, G. I. G., Loose, G. M., van Leeuwen, J., Maan, Y., Mancini, M., Mika, A., Mulder, H., Norden, M. J., Offringa, A. R., Oostrum, L. C., Pastor-Marazuela, I., Pisano, D. J., Ponomareva, A. A., Romein, J. W., Ruiter, M, Schoenmakers, A. P., van der Schuur, D., Sluman, J. J., Smits, R., Stuurwold, K. J. C, Verstappen, J., Vilchez, N. P. E, Vohl, D., Wierenga, K. J., Wijnholds, S. J., Woestenburg, E. E. M., Zanting, A. W., and Ziemke, J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Astrophysics of Galaxies
Abstract

(Abridged) Apertif is a phased-array feed system for WSRT, providing forty instantaneous beams over 300 MHz of bandwidth. A dedicated survey program started on 1 July 2019, with the last observations taken on 28 February 2022. We describe the release of data products from the first year of survey operations, through 30 June 2020. We focus on defining quality control metrics for the processed data products. The Apertif imaging pipeline, Apercal, automatically produces non-primary beam corrected continuum images, polarization images and cubes, and uncleaned spectral line and dirty beam cubes for each beam of an Apertif imaging observation. For this release, processed data products are considered on a beam-by-beam basis within an observation. We validate the continuum images by using metrics that identify deviations from Gaussian noise in the residual images. If the continuum image passes validation, we release all processed data products for a given beam. We apply further validation to the polarization and line data products. We release all raw observational data from the first year of survey observations, for a total of 221 observations of 160 independent target fields, covering approximately one thousand square degrees of sky. Images and cubes are released on a per beam basis, and 3374 beams are released. The median noise in the continuum images is 41.4 uJy/bm, with a slightly lower median noise of 36.9 uJy/bm in the Stokes V polarization image. The median angular resolution is 11.6"/sin(Dec). The median noise for all line cubes, with a spectral resolution of 36.6 kHz, is 1.6 mJy/bm, corresponding to a 3-sigma HI column density sensitivity of 1.8 x 10^20 atoms cm^-2 over 20 km/s (for a median angular resolution of 24" x 15"). We also provide primary beam images for each individual Apertif compound beam. The data are made accessible using a Virtual Observatory interface., Comment: Accepted for publication in A&A, updated Figure 1

Published
2022
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3. Apertif, Phased Array Feeds for the Westerbork Synthesis Radio Telescope

Author

van Cappellen, W. A., Oosterloo, T. A., Verheijen, M. A. W., Adams, E. A. K., Adebahr, B., Braun, R., Hess, K. M., Holties, H., van der Hulst, J. M., Hut, B., Kooistra, E., van Leeuwen, J., Loose, G. M., Morganti, R., Moss, V. A., Orrú, E., Ruiter, M., Schoenmakers, A. P., Vermaas, N. J., Wijnholds, S. J., van Amesfoort, A. S., Arts, M. J., Attema, J. J., Bakker, L., Bassa, C. G., Bast, J. E., Benthem, P., Beukema, R., Blaauw, R., de Blok, W. J. G., Bouwhuis, M., Brink, R. H. van den, Connor, L., Coolen, A. H. W. M., Damstra, S., van Diepen, G. N. J., de Goei, R., Dénes, H., Drost, M., Ebbendorf, N., Frank, B. S., Gardenier, D. W., Gerbers, M., Grange, Y. G., Grit, T., Gunst, A. W., Gupta, N., Ivashina, M. V., Józsa, G. I. G., Janssen, G. H., Koster, A., Kruithof, G. H., Kuindersma, S. J., Kutkin, A., Lucero, D. M., Maan, Y., Maccagni, F. M., van der Marel, J., Mika, A., Morawietz, J., Mulder, H., Mulder, E., Norden, M. J., Offringa, A. R., Oostrum, L. C., Overeem, R. E., Paragi, Z., Pepping, H. J., Petroff, E., Pisano, D. J., Polatidis, A. G., Prasad, P., de Reijer, J. P. R., Romein, J. W., Schaap, J., Schoonderbeek, G. W., Schulz, R., van der Schuur, D., Sclocco, A., Sluman, J. J., Smits, R., Stappers, B. W., Straal, S. M., Stuurwold, K. J. C., Verstappen, J., Vohl, D., Wierenga, K. J., Woestenburg, E. E. M., Zanting, A. W., and Ziemke, J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We describe the APERture Tile In Focus (Apertif) system, a phased array feed (PAF) upgrade of the Westerbork Synthesis Radio Telescope which has transformed this telescope into a high-sensitivity, wide field-of-view L-band imaging and transient survey instrument. Using novel PAF technology, up to 40 partially overlapping beams can be formed on the sky simultaneously, significantly increasing the survey speed of the telescope. With this upgraded instrument, an imaging survey covering an area of 2300 deg2 is being performed which will deliver both continuum and spectral line data sets, of which the first data has been publicly released. In addition, a time domain transient and pulsar survey covering 15,000 deg2 is in progress. An overview of the Apertif science drivers, hardware and software of the upgraded telescope is presented, along with its key performance characteristics., Comment: 29 pages, 42 figures, accepted for publication by A&A

Published
2021
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4. Target and (Astro-)WISE technologies - Data federations and its applications

Author

Valentijn, E. A., Begeman, K., Belikov, A., Boxhoorn, D. R., Brinchmann, J., McFarland, J., Holties, H., Kuijken, K. H., Kleijn, G. Verdoes, Vriend, W-J., Williams, O. R., Roerdink, J. B. T. M., Schomaker, L. R. B., Swertz, M. A., Tsyganov, A., and van Dijk, G. J. W.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

After its first implementation in 2003 the Astro-WISE technology has been rolled out in several European countries and is used for the production of the KiDS survey data. In the multi-disciplinary Target initiative this technology, nicknamed WISE technology, has been further applied to a large number of projects. Here, we highlight the data handling of other astronomical applications, such as VLT-MUSE and LOFAR, together with some non-astronomical applications such as the medical projects Lifelines and GLIMPS, the MONK handwritten text recognition system, and business applications, by amongst others, the Target Holding. We describe some of the most important lessons learned and describe the application of the data-centric WISE type of approach to the Science Ground Segment of the Euclid satellite., Comment: 9 pages, 5 figures, Proceedngs IAU Symposium No 325 Astroinformatics 2017

Published
2016
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5. The LOFAR Multifrequency Snapshot Sky Survey (MSSS) I. Survey description and first results

Author

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

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

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 is exceptional due to its intrinsic multifrequency nature providing information about the spectral properties of the detected sources over more than two octaves (from 30 to 160 MHz). The broadband frequency coverage, together with the fast survey speed generated by LOFAR's multibeaming capabilities, make MSSS the first survey of the sort anticipated to be carried out with the forthcoming Square Kilometre Array (SKA). Two of the sixteen frequency bands included in the survey were chosen to exactly overlap the frequency coverage of large-area Very Large Array (VLA) and Giant Metrewave Radio Telescope (GMRT) surveys at 74 MHz and 151 MHz respectively. The survey performance is illustrated within the "MSSS Verification Field" (MVF), a region of 100 square degrees centered at J2000 (RA,Dec)=(15h,69deg). The MSSS results from the MVF are compared with previous radio survey catalogs. We assess the flux and astrometric uncertainties in the catalog, as well as the completeness and reliability considering our source finding strategy. We determine the 90% completeness levels within the MVF to be 100 mJy at 135 MHz with 108" resolution, and 550 mJy at 50 MHz with 166" resolution. Images and catalogs for the full survey, expected to contain 150,000-200,000 sources, will be released to a public web server. We outline the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs., Comment: 23 pages, 19 figures. Accepted for publication in Astronomy & Astrophysics. MSSS Verification Field images and catalog data may be downloaded from http://vo.astron.nl

Published
2015
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6. Probing Atmospheric Electric Fields in Thunderstorms through Radio Emission from Cosmic-Ray-Induced Air Showers

Author

Schellart, P., Trinh, T. N. G., Buitink, S., Corstanje, A., Enriquez, J. E., Falcke, H., Hörandel, J. R., Nelles, A., Rachen, J. P., Rossetto, L., Scholten, O., ter Veen, S., Thoudam, S., Ebert, U., Koehn, C., Rutjes, C., Alexov, A., Anderson, J. M., Avruch, I. M., Bentum, M. J., Bernardi, G., Best, P., Bonafede, A., Breitling, F., Broderick, J. W., Brüggen, M., Butcher, H. R., Ciardi, B., de Geus, E., de Vos, M., Duscha, S., Eislöffel, J., Fallows, R. A., Frieswijk, W., Garrett, M. A., Grießmeier, J., Gunst, A. W., Heald, G., Hessels, J. W. T., Hoeft, M., Holties, H. A., Juette, E., Kondratiev, V. I., Kuniyoshi, M., Kuper, G., Mann, G., McFadden, R., McKay-Bukowski, D., McKean, J. P., Mevius, M., Moldon, J., Norden, M. J., Orru, E., Paas, H., Pandey-Pommier, M., Pizzo, R., Polatidis, A. G., Reich, W., Röttgering, H., Scaife, A. M. M., Schwarz, D. J., Serylak, M., Smirnov, O., Steinmetz, M., Swinbank, J., Tagger, M., Tasse, C., Toribio, M. C., van Weeren, R. J., Vermeulen, R., Vocks, C., Wise, M. W., Wucknitz, O., and Zarka, P.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present measurements of radio emission from cosmic ray air showers that took place during thunderstorms. The intensity and polarization patterns of these air showers are radically different from those measured during fair-weather conditions. With the use of a simple two-layer model for the atmospheric electric field, these patterns can be well reproduced by state-of-the-art simulation codes. This in turn provides a novel way to study atmospheric electric fields., Comment: 6 pages, 3 figures, accepted for publication in Physical Review Letters

Published
2015
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7. Apertif 1.4 GHz continuum observations of the Boötes field and their combined view with LOFAR

Author

Kutkin, A. M., primary, Oosterloo, T. A., additional, Morganti, R., additional, Offringa, A. R., additional, Adams, E. A. K., additional, Adebahr, B., additional, Dénes, H., additional, Hess, K. M., additional, van der Hulst, J. M., additional, de Blok, W. J. G., additional, Bozkurt, A., additional, van Cappellen, W. A., additional, Gunst, A. W., additional, Holties, H. A., additional, van Leeuwen, J., additional, Loose, G. M., additional, Oostrum, L. C., additional, Vohl, D., additional, Wijnholds, S. J., additional, and Ziemke, J., additional

Published
2023
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8. First release of Apertif imaging survey data

Author

Adams, E. A. K., primary, Adebahr, B., additional, de Blok, W. J. G., additional, Dénes, H., additional, Hess, K. M., additional, van der Hulst, J. M., additional, Kutkin, A., additional, Lucero, D. M., additional, Morganti, R., additional, Moss, V. A., additional, Oosterloo, T. A., additional, Orrú, E., additional, Schulz, R., additional, van Amesfoort, A. S., additional, Berger, A., additional, Boersma, O. M., additional, Bouwhuis, M., additional, van den Brink, R., additional, van Cappellen, W. A., additional, Connor, L., additional, Coolen, A. H. W. M., additional, Damstra, S., additional, van Diepen, G. N. J., additional, Dijkema, T. J., additional, Ebbendorf, N., additional, Grange, Y. G., additional, de Goei, R., additional, Gunst, A. W., additional, Holties, H. A., additional, Hut, B., additional, Ivashina, M. V., additional, Józsa, G. I. G., additional, van Leeuwen, J., additional, Loose, G. M., additional, Maan, Y., additional, Mancini, M., additional, Mika, Á., additional, Mulder, H., additional, Norden, M. J., additional, Offringa, A. R., additional, Oostrum, L. C., additional, Pastor-Marazuela, I., additional, Pisano, D. J., additional, Ponomareva, A. A., additional, Romein, J. W., additional, Ruiter, M., additional, Schoenmakers, A. P., additional, van der Schuur, D., additional, Sluman, J. J., additional, Smits, R., additional, Stuurwold, K. J. C., additional, Verstappen, J., additional, Vilchez, N. P. E., additional, Vohl, D., additional, Wierenga, K. J., additional, Wijnholds, S. J., additional, Woestenburg, E. E. M., additional, Zanting, A. W., additional, and Ziemke, J., additional

Published
2022
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9. Apertif: Phased array feeds for the Westerbork Synthesis Radio Telescope

Author

van Cappellen, W. A., primary, Oosterloo, T. A., additional, Verheijen, M. A. W., additional, Adams, E. A. K., additional, Adebahr, B., additional, Braun, R., additional, Hess, K. M., additional, Holties, H., additional, van der Hulst, J. M., additional, Hut, B., additional, Kooistra, E., additional, van Leeuwen, J., additional, Loose, G. M., additional, Morganti, R., additional, Moss, V. A., additional, Orrú, E., additional, Ruiter, M., additional, Schoenmakers, A. P., additional, Vermaas, N. J., additional, Wijnholds, S. J., additional, van Amesfoort, A. S., additional, Arts, M. J., additional, Attema, J. J., additional, Bakker, L., additional, Bassa, C. G., additional, Bast, J. E., additional, Benthem, P., additional, Beukema, R., additional, Blaauw, R., additional, de Blok, W. J. G., additional, Bouwhuis, M., additional, van den Brink, R. H., additional, Connor, L., additional, Coolen, A. H. W. M., additional, Damstra, S., additional, van Diepen, G. N. J., additional, de Goei, R., additional, Dénes, H., additional, Drost, M., additional, Ebbendorf, N., additional, Frank, B. S., additional, Gardenier, D. W., additional, Gerbers, M., additional, Grange, Y. G., additional, Grit, T., additional, Gunst, A. W., additional, Gupta, N., additional, Ivashina, M. V., additional, Józsa, G. I. G., additional, Janssen, G. H., additional, Koster, A., additional, Kruithof, G. H., additional, Kuindersma, S. J., additional, Kutkin, A., additional, Lucero, D. M., additional, Maan, Y., additional, Maccagni, F. M., additional, van der Marel, J., additional, Mika, A., additional, Morawietz, J., additional, Mulder, H., additional, Mulder, E., additional, Norden, M. J., additional, Offringa, A. R., additional, Oostrum, L. C., additional, Overeem, R. E., additional, Paragi, Z., additional, Pepping, H. J., additional, Petroff, E., additional, Pisano, D. J., additional, Polatidis, A. G., additional, Prasad, P., additional, de Reijer, J. P. R., additional, Romein, J. W., additional, Schaap, J., additional, Schoonderbeek, G. W., additional, Schulz, R., additional, van der Schuur, D., additional, Sclocco, A., additional, Sluman, J. J., additional, Smits, R., additional, Stappers, B. W., additional, Straal, S. M., additional, Stuurwold, K. J. C., additional, Verstappen, J., additional, Vohl, D., additional, Wierenga, K. J., additional, Woestenburg, E. E. M., additional, Zanting, A. W., additional, and Ziemke, J., additional

Published
2022
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10. Apertif: lessons learned operating a Phased Array Feed array

Author

Orru, E., primary, Adams, E. A. K., additional, Bouwhuis, M., additional, Coolen, A., additional, Holties, H., additional, van Leeuwen, J., additional, Moss, V. A., additional, Mulder, H., additional, Norden, M., additional, Oostrum, L. C., additional, Schoenmakers, A., additional, van der Tol, S., additional, and Veermas, N., additional

Published
2021
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11. Low-frequency radio absorption in Cassiopeia A

Author

Arias, M., Vink, J., de Gasperin, F., Salas, P., Oonk, J. B. R., van Weeren, R. J., van Amesfoort, A. S., Anderson, J., Beck, R., Bell, M. E., Bentum, M. J., Best, P., Blaauw, R., Breitling, F., Broderick, J. W., Brouw, W. N., Brueggen, M., Butcher, H. R., Ciardi, B., de Geus, E., Deller, A., van Dijk, P. C. G., Duscha, S., Eisloeffel, J., Garrett, M. A., Griessmeier, J. M., Gunst, A. W., van Haarlem, M. P., Heald, G., Hessels, J., Horandel, J., Holties, H. A., van der Horst, A. J., Iacobelli, M., Juette, E., Krankowski, A., van Leeuwen, J., Mann, G., McKay-Bukowski, D., McKean, J. P., Mulder, H., Nelles, A., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V. N., Pekal, R., Pizzo, R., Polatidis, A. G., Reich, W., Rottgering, H. J. A., Rothkaehl, H., Schwarz, D. J., Smirnov, O., Soida, M., Steinmetz, M., Tagger, M., Thoudam, Satyendra, Toribio, M. C., Vocks, C., van der Wiel, M. H. D., Wijers, R. A. M. J., Wucknitz, O., Zarka, P., Zucca, P., Arias, M., Vink, J., de Gasperin, F., Salas, P., Oonk, J. B. R., van Weeren, R. J., van Amesfoort, A. S., Anderson, J., Beck, R., Bell, M. E., Bentum, M. J., Best, P., Blaauw, R., Breitling, F., Broderick, J. W., Brouw, W. N., Brueggen, M., Butcher, H. R., Ciardi, B., de Geus, E., Deller, A., van Dijk, P. C. G., Duscha, S., Eisloeffel, J., Garrett, M. A., Griessmeier, J. M., Gunst, A. W., van Haarlem, M. P., Heald, G., Hessels, J., Horandel, J., Holties, H. A., van der Horst, A. J., Iacobelli, M., Juette, E., Krankowski, A., van Leeuwen, J., Mann, G., McKay-Bukowski, D., McKean, J. P., Mulder, H., Nelles, A., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V. N., Pekal, R., Pizzo, R., Polatidis, A. G., Reich, W., Rottgering, H. J. A., Rothkaehl, H., Schwarz, D. J., Smirnov, O., Soida, M., Steinmetz, M., Tagger, M., Thoudam, Satyendra, Toribio, M. C., Vocks, C., van der Wiel, M. H. D., Wijers, R. A. M. J., Wucknitz, O., Zarka, P., and Zucca, P.

Abstract

Context. Cassiopeia A is one of the best-studied supernova remnants. Its bright radio and X-ray emission is due to shocked ejecta. Cas A is rather unique in that the unshocked ejecta can also be studied: through emission in the infrared, the radio-active decay of Ti-44, and the low-frequency free-free absorption caused by cold ionised gas, which is the topic of this paper. Aims. Free-free absorption processes are affected by the mass, geometry, temperature, and ionisation conditions in the absorbing gas. Observations at the lowest radio frequencies can constrain a combination of these properties. Methods. We used Low Frequency Array (LOFAR) Low Band Antenna observations at 30-77 MHz and Very Large Array (VLA) L-band observations at 1-2 GHz to fit for internal absorption as parametrised by the emission measure. We simultaneously fit multiple UV-matched images with a common resolution of 17 '' (this corresponds to 0.25 pc for a source at the distance of Cas A). The ample frequency coverage allows us separate the relative contributions from the absorbing gas, the unabsorbed front of the shell, and the absorbed back of the shell to the emission spectrum. We explored the effects that a temperature lower than the similar to 100-500 K proposed from infrared observations and a high degree of clumping can have on the derived physical properties of the unshocked material, such as its mass and density. We also compiled integrated radio flux density measurements, fit for the absorption processes that occur in the radio band, and considered their effect on the secular decline of the source. Results. We find a mass in the unshocked ejecta of M = 2.95 +/- 0.48 M-circle dot for an assumed gas temperature of T = 100 K. This estimate is reduced for colder gas temperatures and, most significantly, if the ejecta are clumped. We measure the reverse shock to have a radius of 114 '' +/- 6 '' and be centred at 23:23:26, +58:48:54 (J2000). We also find that a decrease in the amount of mass

Published
2018
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12. Low-frequency radio absorption in Cassiopeia A

Author

Arias, M., primary, Vink, J., additional, de Gasperin, F., additional, Salas, P., additional, Oonk, J. B. R., additional, van Weeren, R. J., additional, van Amesfoort, A. S., additional, Anderson, J., additional, Beck, R., additional, Bell, M. E., additional, Bentum, M. J., additional, Best, P., additional, Blaauw, R., additional, Breitling, F., additional, Broderick, J. W., additional, Brouw, W. N., additional, Brüggen, M., additional, Butcher, H. R., additional, Ciardi, B., additional, de Geus, E., additional, Deller, A., additional, van Dijk, P. C. G., additional, Duscha, S., additional, Eislöffel, J., additional, Garrett, M. A., additional, Grießmeier, J. M., additional, Gunst, A. W., additional, van Haarlem, M. P., additional, Heald, G., additional, Hessels, J., additional, Hörandel, J., additional, Holties, H. A., additional, van der Horst, A. J., additional, Iacobelli, M., additional, Juette, E., additional, Krankowski, A., additional, van Leeuwen, J., additional, Mann, G., additional, McKay-Bukowski, D., additional, McKean, J. P., additional, Mulder, H., additional, Nelles, A., additional, Orru, E., additional, Paas, H., additional, Pandey-Pommier, M., additional, Pandey, V. N., additional, Pekal, R., additional, Pizzo, R., additional, Polatidis, A. G., additional, Reich, W., additional, Röttgering, H. J. A., additional, Rothkaehl, H., additional, Schwarz, D. J., additional, Smirnov, O., additional, Soida, M., additional, Steinmetz, M., additional, Tagger, M., additional, Thoudam, S., additional, Toribio, M. C., additional, Vocks, C., additional, van der Wiel, M. H. D., additional, Wijers, R. A. M. J., additional, Wucknitz, O., additional, Zarka, P., additional, and Zucca, P., additional

Published
2018
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14. The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

Author

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

Abstract

We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky Low Frequency Array (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 is exceptional due to its intrinsic multifrequency nature providing information about the spectral properties of the detected sources over more than two octaves (from 30 to 160 MHz). The broadband frequency coverage, together with the fast survey speed generated by LOFAR’s multibeaming capabilities, make MSSS the first survey of the sort anticipated to be carried out with the forthcoming Square Kilometre Array (SKA). Two of the sixteen frequency bands included in the survey were chosen to exactly overlap the frequency coverage of large-area Very Large Array (VLA) and Giant Metrewave Radio Telescope (GMRT) surveys at 74 MHz and 151 MHz respectively. The survey performance is illustrated within the MSSS Verification Field (MVF), a region of 100 square degrees centered at (α,δ)J2000 = (15h,69°). The MSSS results from the MVF are compared with previous radio survey catalogs. We assess the flux and astrometric uncertainties in the catalog, as well as the completeness and reliability considering our source finding strategy. We determine the 90% completeness levels within the MVF to be 100 mJy at 135 MHz with 108" resolution, and 550 mJy at 50 MHz with 166" resolution. Images and catalogs for the full survey, expected to contain 150,000–200,000 sources, will be released to a public web server. We outline the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs.

Published
2015

15. Target and (Astro-)WISE technologies Data federations and its applications

Author

Valentijn, E. A., primary, Begeman, K., additional, Belikov, A., additional, Boxhoorn, D. R., additional, Brinchmann, J., additional, McFarland, J., additional, Holties, H., additional, Kuijken, K. H., additional, Kleijn, G. Verdoes, additional, Vriend, W-J., additional, Williams, O. R., additional, Roerdink, J. B. T. M., additional, Schomaker, L. R. B., additional, Swertz, M. A., additional, Tsyganov, A., additional, and van Dijk, G. J. W., additional

Published
2016
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16. Probing atmospheric electric fields in thunderstorms through radio emission from cosmic-ray-induced air showers

Author

Schellart, P, Trinh, T. N. G., Buitink, S, Corstanje, Arthur, Enriquez, J.E., Falcke, H, Hörandel, J.R., Nelles, A, Rachen, J.P., Rossetto, L, Scholten, O, Ter Veen, Sander, Thoudam, Satyendra, Ebert, U, Koehn, C, Rutjes, C, Alexov, A., Anderson, J M, Avruch, Ian M., Bentum, M J, Bernardi, G, Best, Phillip, Bonafede, A, Breitling, F, Broderick, J, Bruggen, M, Butcher, Harvey, Ciardi, Benedetta, de Geus, Eugene, de Vos, Marco, Duscha, S, Eisloffel, Jochen, Hoeft, M, Holties, H. A, Juette, E, Kondratiev, V. I., Kuniyoshi, M, Kuper, G., Mann, Gottfried, McFadden, R, McKay-Bukowski, D, McKean, J P, Mevius, Maaijke, Moldon, J, Norden, M J, Orru, Emanuela, Paas, H., Pandey-Pommier, Mamta, Pizzo, R, Polatidis, A.G., Reich, W, Rottgering, Hubb, Scaife, Anna, Schwarz, Dominik, Serylak, M, Smirnov, O, Steinmetz, M., Swinbank, J, Tagger, Michel, Tasse, C, van Weeren, Reinout J., Toribio, C., Vermeulen, R.C., Vocks, Christian, Wise, Michael W, Wucknitz, O, Zarka, P, Schellart, P, Trinh, T. N. G., Buitink, S, Corstanje, Arthur, Enriquez, J.E., Falcke, H, Hörandel, J.R., Nelles, A, Rachen, J.P., Rossetto, L, Scholten, O, Ter Veen, Sander, Thoudam, Satyendra, Ebert, U, Koehn, C, Rutjes, C, Alexov, A., Anderson, J M, Avruch, Ian M., Bentum, M J, Bernardi, G, Best, Phillip, Bonafede, A, Breitling, F, Broderick, J, Bruggen, M, Butcher, Harvey, Ciardi, Benedetta, de Geus, Eugene, de Vos, Marco, Duscha, S, Eisloffel, Jochen, Hoeft, M, Holties, H. A, Juette, E, Kondratiev, V. I., Kuniyoshi, M, Kuper, G., Mann, Gottfried, McFadden, R, McKay-Bukowski, D, McKean, J P, Mevius, Maaijke, Moldon, J, Norden, M J, Orru, Emanuela, Paas, H., Pandey-Pommier, Mamta, Pizzo, R, Polatidis, A.G., Reich, W, Rottgering, Hubb, Scaife, Anna, Schwarz, Dominik, Serylak, M, Smirnov, O, Steinmetz, M., Swinbank, J, Tagger, Michel, Tasse, C, van Weeren, Reinout J., Toribio, C., Vermeulen, R.C., Vocks, Christian, Wise, Michael W, Wucknitz, O, and Zarka, P

Abstract

We present measurements of radio emission from cosmic ray air showers that took place during thunderstorms. The intensity and polarization patterns of these air showers are radically different from those measured during fair-weather conditions. With the use of a simple two-layer model for the atmospheric electric field, these patterns can be well reproduced by state-of-the-art simulation codes. This in turn provides a novel way to study atmospheric electric fields.

Published
2015

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

Author

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

Abstract

We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky Low Frequency Array (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 is exceptional due to its intrinsic multifrequency nature providing information about the spectral properties of the detected sources over more than two octaves (from 30 to 160 MHz). The broadband frequency coverage, together with the fast survey speed generated by LOFAR's multibeaming capabilities, make MSSS the first survey of the sort anticipated to be carried out with the forthcoming Square Kilometre Array (SKA). Two of the sixteen frequency bands included in the survey were chosen to exactly overlap the frequency coverage of large-area Very Large Array (VLA) and Giant Metrewave Radio Telescope (GMRT) surveys at 74 MHz and 151 MHz respectively. The survey performance is illustrated within the MSSS Verification Field (MVF), a region of 100 square degrees centered at (a,d)J2000 = (15h,69°). The MSSS results from the MVF are compared with previous radio survey catalogs. We assess the flux and astrometric uncertainties in the catalog, as well as the completeness and reliability considering our source finding strategy. We determine the 90% completeness levels within the MVF to be 100 mJy at 135 MHz with 108? resolution, and 550 mJy at 50 MHz with 166? resolution. Images and catalogs for the full survey, expected to contain 150 000-200 000 sources, will be released to a public web server. We outline the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs.

Published
2015

18. The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

Author

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

Published
2015
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19. Probing Atmospheric Electric Fields in Thunderstorms through Radio Emission from Cosmic-Ray-Induced Air Showers

Author

Schellart, P., primary, Trinh, T. N. G., additional, Buitink, S., additional, Corstanje, A., additional, Enriquez, J. E., additional, Falcke, H., additional, Hörandel, J. R., additional, Nelles, A., additional, Rachen, J. P., additional, Rossetto, L., additional, Scholten, O., additional, ter Veen, S., additional, Thoudam, S., additional, Ebert, U., additional, Koehn, C., additional, Rutjes, C., additional, Alexov, A., additional, Anderson, J. M., additional, Avruch, I. M., additional, Bentum, M. J., additional, Bernardi, G., additional, Best, P., additional, Bonafede, A., additional, Breitling, F., additional, Broderick, J. W., additional, Brüggen, M., additional, Butcher, H. R., additional, Ciardi, B., additional, de Geus, E., additional, de Vos, M., additional, Duscha, S., additional, Eislöffel, J., additional, Fallows, R. A., additional, Frieswijk, W., additional, Garrett, M. A., additional, Grießmeier, J., additional, Gunst, A. W., additional, Heald, G., additional, Hessels, J. W. T., additional, Hoeft, M., additional, Holties, H. A., additional, Juette, E., additional, Kondratiev, V. I., additional, Kuniyoshi, M., additional, Kuper, G., additional, Mann, G., additional, McFadden, R., additional, McKay-Bukowski, D., additional, McKean, J. P., additional, Mevius, M., additional, Moldon, J., additional, Norden, M. J., additional, Orru, E., additional, Paas, H., additional, Pandey-Pommier, M., additional, Pizzo, R., additional, Polatidis, A. G., additional, Reich, W., additional, Röttgering, H., additional, Scaife, A. M. M., additional, Schwarz, D. J., additional, Serylak, M., additional, Smirnov, O., additional, Steinmetz, M., additional, Swinbank, J., additional, Tagger, M., additional, Tasse, C., additional, Toribio, M. C., additional, van Weeren, R. J., additional, Vermeulen, R., additional, Vocks, C., additional, Wise, M. W., additional, Wucknitz, O., additional, and Zarka, P., additional

Published
2015
Full Text
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