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Lofar low-band antenna observations of the 3C 295 and boötes fields: Source counts and ultra-steep spectrum sources
- van Weeren, R. J. (author)
- Williams, W. L. (author)
- Tasse, C. (author)
- show more...
- Rottgering, H. (author)
- Rafferty, D. (author)
- van der Tol, S. (author)
- Heald, G. (author)
- White, G. J. (author)
- Shulevski, A. (author)
- Best, P. (author)
- Intema, H. T. (author)
- Bhatnagar, S. (author)
- Reich, W. (author)
- Steinmetz, M. (author)
- van Velzen, S. (author)
- Ensslin, T. A. (author)
- Prandoni, I. (author)
- De Gasperin, F. (author)
- Jamrozy, M. (author)
- Brunetti, G. (author)
- Jarvis, M. J. (author)
- McKean, J. P. (author)
- Wise, M. W. (author)
- Ferrari, C. (author)
- Harwood, J. (author)
- Oonk, J. B. R. (author)
- Hoeft, M. (author)
- Kunert-Bajraszewska, M. (author)
- Wucknitz, O. (author)
- Bonafede, A. (author)
- Mohan, N. R. (author)
- Scaife, A. M. M. (author)
- Kloeckner, H. -R. (author)
- van Bemmel, I. (author)
- Merloni, A. (author)
- Chyz̊y, K.T. (author)
- Engels, D. (author)
- Falcke, H. (author)
- Pandey-Pommier, M. (author)
- Alexov, A. (author)
- Anderson, J. (author)
- Avruch, I. M. (author)
- Beck, R. (author)
- Bell, M. E. (author)
- Bentum, M. J. (author)
- Bernardi, G. (author)
- Breitling, F. (author)
- Broderick, J. (author)
- Brouw, W. N. (author)
- Brueggen, M. (author)
- Butcher, H. R. (author)
- Ciardi, B. (author)
- de Geus, E. (author)
- de Vos, M. (author)
- Deller, A. (author)
- Duscha, S. (author)
- Eislöffel, J. (author)
- Fallows, R. A. (author)
- Frieswijk, W. (author)
- Garrett, M. A. (author)
- Griessmeier, J. (author)
- Gunst, A. W. (author)
- Hamaker, J. P. (author)
- Hassall, T. E. (author)
- Horandel, J. (author)
- van der Horst, A. (author)
- Iacobelli, M. (author)
- Jackson, N. J. (author)
- Juette, E. (author)
- Kondratiev, V. I. (author)
- Kuniyoshi, M. (author)
- Maat, P. (author)
- Mann, G. (author)
- McKay-Bukowski, D. (author)
- Mevius, M. (author)
- Morganti, R. (author)
- Munk, H. (author)
- Offringa, A. R. (author)
- Orru, E. (author)
- Paas, H. (author)
- Pandey, V. N. (author)
- Pietka, G. (author)
- Pizzo, R. (author)
- Polatidis, A. G. (author)
- Renting, A. (author)
- Rowlinson, A. (author)
- Schwarz, D. (author)
- Serylak, M. (author)
- Sluman, J. (author)
- Smirnov, O. (author)
- Stappers, B. W. (author)
- Stewart, A. (author)
- Swinbank, J. (author)
- Tagger, M. (author)
- Tang, Y. (author)
- Toribio, C. (author)
- Vermeulen, R. (author)
- Vocks, C. (author)
- Zarka, P. (author)
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- (creator_code:org_t)
- 2014
- 2014
- English.
- In: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 793:2, s. art. 82-
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- 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
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- large array
- deep
- frequency sky survey
- mini-survey
- 74 mhz
- scale structure survey
- wide-field
- active galactic nuclei
- redshift radio galaxies
- extragalactic survey
- Astroparticle Physics
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
- van Weeren, R. J ...
- Williams, W. L.
- Tasse, C.
- Rottgering, H.
- Rafferty, D.
- van der Tol, S.
- show more...
- Heald, G.
- White, G. J.
- Shulevski, A.
- Best, P.
- Intema, H. T.
- Bhatnagar, S.
- Reich, W.
- Steinmetz, M.
- van Velzen, S.
- Ensslin, T. A.
- Prandoni, I.
- De Gasperin, F.
- Jamrozy, M.
- Brunetti, G.
- Jarvis, M. J.
- McKean, J. P.
- Wise, M. W.
- Ferrari, C.
- Harwood, J.
- Oonk, J. B. R.
- Hoeft, M.
- Kunert-Bajraszew ...
- Horellou, Cathy, ...
- Wucknitz, O.
- Bonafede, A.
- Mohan, N. R.
- Scaife, A. M. M.
- Kloeckner, H. -R ...
- van Bemmel, I.
- Merloni, A.
- Chyz̊y, K.T.
- Engels, D.
- Falcke, H.
- Pandey-Pommier, ...
- Alexov, A.
- Anderson, J.
- Avruch, I. M.
- Beck, R.
- Bell, M. E.
- Bentum, M. J.
- Bernardi, G.
- Breitling, F.
- Broderick, J.
- Brouw, W. N.
- Brueggen, M.
- Butcher, H. R.
- Ciardi, B.
- de Geus, E.
- de Vos, M.
- Deller, A.
- Duscha, S.
- Eislöffel, J.
- Fallows, R. A.
- Frieswijk, W.
- Garrett, M. A.
- Griessmeier, J.
- Gunst, A. W.
- Hamaker, J. P.
- Hassall, T. E.
- Horandel, J.
- van der Horst, A ...
- Iacobelli, M.
- Jackson, N. J.
- Juette, E.
- Kondratiev, V. I ...
- Kuniyoshi, M.
- Maat, P.
- Mann, G.
- McKay-Bukowski, ...
- Mevius, M.
- Morganti, R.
- Munk, H.
- Offringa, A. R.
- Orru, E.
- Paas, H.
- Pandey, V. N.
- Pietka, G.
- Pizzo, R.
- Polatidis, A. G.
- Renting, A.
- Rowlinson, A.
- Schwarz, D.
- Serylak, M.
- Sluman, J.
- Smirnov, O.
- Stappers, B. W.
- Stewart, A.
- Swinbank, J.
- Tagger, M.
- Tang, Y.
- Thoudam, Satyend ...
- Toribio, C.
- Vermeulen, R.
- Vocks, C.
- Zarka, P.
- show less...
- About the subject
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- NATURVETENSKAP
- NATURVETENSKAP
- and Fysik
- and Astronomi astrof ...
- Articles in the publication
- Astrophysical Jo ...
- By the university
- Chalmers University of Technology
- Linnaeus University
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