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1.	van Weeren, R. J., et al. (author) Lofar low-band antenna observations of the 3C 295 and boötes fields: Source counts and ultra-steep spectrum sources 2014 In: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 793:2, s. art. 82- Journal article (peer-reviewed)abstract We present Low Frequency Array (LOFAR) Low Band observations of the Bootes and 3C 295 fields. Our images made at 34, 46, and 62 MHz reach noise levels of 12, 8, and 5 mJy beam(-1), making them the deepest images ever obtained in this frequency range. In total, we detect between 300 and 400 sources in each of these images, covering an area of 17-52 deg(2). From the observations, we derive Euclidean-normalized differential source counts. The 62 MHz source counts agree with previous GMRT 153 MHz and Very Large Array 74 MHz differential source counts, scaling with a spectral index of -0.7. We find that a spectral index scaling of -0.5 is required to match up the LOFAR 34 MHz source counts. This result is also in agreement with source counts from the 38 MHz 8C survey, indicating that the average spectral index of radio sources flattens toward lower frequencies. We also find evidence for spectral flattening using the individual flux measurements of sources between 34 and 1400 MHz and by calculating the spectral index averaged over the source population. To select ultra-steep spectrum (alpha
2.	Ebert, U., et al. (author) Determining atmospheric electric fields from the radio footprint of cosmic-ray induced extensive air showers as measured with LOFAR 2014 In: AGU Fall Meeting Abstracts 2014. Conference paper (peer-reviewed)

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Type of publication: conference paper (1); journal article (1)

Type of content: peer-reviewed (2)

Author/Editor: Horandel, J. (2); Thoudam, Satyendra (2); Bernardi, G. (1); Buitink, S. (1); Stappers, B. W. (1); Swinbank, J. (1); show more...; Jamrozy, M. (1); Anderson, J. (1); Mevius, M (1); Ferrari, C. (1); Horellou, Cathy, 196 ... (1); Ensslin, T. A. (1); Rachen, J. P. (1); Morganti, R. (1); Orru, E. (1); Gunst, A. W. (1); Offringa, A. R. (1); Beck, R. (1); Nelles, A. (1); Scholten, O. (1); Brunetti, G. (1); de Geus, E. (1); van Bemmel, I. (1); Stewart, A (1); Rottgering, H. (1); White, G. J. (1); De Vos, M (1); Ciardi, B. (1); Deller, A. (1); Steinmetz, M. (1); de Gasperin, F. (1); Oonk, J. B. R. (1); van Weeren, R. J. (1); Bell, M. E. (1); Bentum, M. J. (1); Best, P. (1); Breitling, F. (1); Brouw, W. N. (1); Brueggen, M. (1); Butcher, H. R. (1); Duscha, S. (1); Garrett, M. A. (1); Heald, G. (1); Iacobelli, M. (1); Juette, E. (1); Mann, G. (1); McKay-Bukowski, D. (1); McKean, J. P. (1); Paas, H. (1); Pandey-Pommier, M. (1); show less...

University: Linnaeus University (2); Chalmers University of Technology (1)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2014 (2)Undo refine

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