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  • Kutkin, A. M.Netherlands Institute for Radio Astronomy (ASTRON) (author)

Apertif 1.4 GHz continuum observations of the Boötes field and their combined view with LOFAR

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:41776c0a-049c-4596-b918-a7eee5f94dd6
  • https://research.chalmers.se/publication/537154URI
  • https://doi.org/10.1051/0004-6361/202346618DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We present a new image of a 26.5 square degrees region in the Boötes 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 that includes direction-dependent self-calibration, which provides a significant improvement in the quality of the images compared to those released as part of the Apertif first data release. For the Boötes region, we mosaicked 187 Apertif images and extracted a source catalog. The mosaic image has an angular resolution of 27 × 11.5″ and a median background noise of 40 μJy beam-1. The catalog has 8994 sources and is complete down to the 0.3 mJy level. We combined the Apertif image with LOFAR images of the Boötes field at 54 and 150 MHz to study the spectral properties of the sources. We find a spectral flattening toward sources with a low flux density. Using the spectral index limits from Apertif nondetections, we derive that up to 9% of the sources have ultrasteep spectra with a slope below -1.2. A steepening of the spectral index with increasing redshift is also seen in the data, which shows a different dependence for the low-and high-frequency spectral index. The explanation probably is that a population of sources has concave radio spectra with a turnover frequency of about 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 to process data from the Apertif wide-area surveys and release the improved 1.4-GHz images of several well-known fields.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Oosterloo, T.Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Morganti, R.Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen (author)
  • Offringa, A. R.Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen (author)
  • Adams, E. A.K.Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Adebahr, B.Ruhr-Universität Bochum (author)
  • Dénes, H.Yachay Tech,Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Hess, Kelley,1983Chalmers tekniska högskola,Chalmers University of Technology,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA),Netherlands Institute for Radio Astronomy (ASTRON)(Swepub:cth)kelleyh (author)
  • van der Hulst, J. M.Rijksuniversiteit Groningen,University of Groningen (author)
  • de Blok, W.J.G.Rijksuniversiteit Groningen,University of Groningen,University of Cape Town,Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Bozkurt, A.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • van Cappellen, W.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Gunst, A.W.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Holties, H.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • van Leeuwen, J.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Loose, G. M.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Oostrum, L. C.Netherlands Institute for Radio Astronomy (ASTRON),Netherlands eScience Center (author)
  • Vohl, D.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Wijnholds, S. J.Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Ziemke, J.Universitetet i Oslo,University of Oslo,Netherlands Institute for Radio Astronomy (ASTRON) (author)
  • Netherlands Institute for Radio Astronomy (ASTRON)Rijksuniversiteit Groningen (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics6760004-63611432-0746

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