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The Apertif science...
The Apertif science verification campaign: Characteristics of polarised radio sources
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- Adebahr, B. (författare)
- Ruhr-Universität Bochum
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- Berger, A. (författare)
- Ruhr-Universität Bochum
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- Adams, E. A.K. (författare)
- Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON)
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- Hess, K. M. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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- de Blok, W.J.G. (författare)
- Rijksuniversiteit Groningen,University of Groningen,University of Cape Town,Netherlands Institute for Radio Astronomy (ASTRON)
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- Dénes, H. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Moss, V. A. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON),Commonwealth Scientific and Industrial Research Organisation (CSIRO),The University of Sydney
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- Schulz, R. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- van der Hulst, J. M. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Connor, L. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON),California Institute of Technology (Caltech)
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- Damstra, Sieds (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Hut, B. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Ivashina, Marianna, 1975 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Loose, G. M. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Maan, Y. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON),National Centre for Radio Astrophysics India
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- Mika, (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Mulder, H. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Norden, M. J. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Oostrum, L. C. (författare)
- Anton Pannekoek Institute for Astronomy,Netherlands eScience Center
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- Orrú, E. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Ruiter, Mark (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Smits, R. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- van Cappellen, W. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- van Leeuwen, J. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Vermaas, N. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Vohl, D. (författare)
- Universiteit Van Amsterdam,University of Amsterdam,Netherlands Institute for Radio Astronomy (ASTRON)
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- Ziemke, J. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON),Universitetet i Oslo,University of Oslo
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(creator_code:org_t)
- 2022-07-19
- 2022
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 663
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. The characteristics of the polarised radio sky are a key ingredient in constraining evolutionary models of magnetic fields in the Universe and their role in feedback processes. The origin of the polarised emission and the characteristics of the intergalactic medium on the line of sight can be investigated using large samples of polarised sources. Ancillary infrared (IR) and optical data can be used to study the nature of the emitting objects. Aims. We analyse five early science datasets from the APERture Tile in Focus (Apertif) phased array feed system to verify the polarisation capabilities of Apertif in view of future larger data releases. We aim to characterise the source population of the polarised sky in the L-Band using polarised source information in combination with IR and optical data. Methods. We use automatic routines to generate full field-of-view Q- and U-cubes and perform rotation measure (RM)-Synthesis, source finding, and cross-matching with published radio, optical, and IR data to generate polarised source catalogues. All sources were inspected individually by eye for verification of their IR and optical counterparts. Spectral energy distribution (SED)-fitting routines were used to determine photometric redshifts, star-formation rates, and galaxy masses. IR colour information was used to classify sources as active galactic nuclei (AGN) or star-forming-dominated and early- or late-type. Results. We surveyed an area of 56 deg2 and detected 1357 polarised source components in 1170 sources. The fraction of polarised sources is 10.57% with a median fractional polarisation of 4.70 ± 0.14%. We confirmed the reliability of the Apertif measurements by comparing them with polarised cross-identified NVSS sources. Average RMs of the individual fields lie within the error of the best Milky Way foreground measurements. All of our polarised sources were found to be dominated by AGN activity in the radio regime with most of them being radio-loud (79%) and of the Fanaroff-Riley (FR)II class (87%). The host galaxies of our polarised source sample are dominated by intermediate disc and star-forming disc galaxies. The contribution of star formation to the radio emission is on the order of a few percent for 10% of the polarised sources while for 90% it is completely dominated by the AGN. We do not see any change in fractional polarisation for different star-formation rates of the AGN host galaxies. Conclusions. The Apertif system is suitable for large-area high-sensitivity polarised sky surveys. The data products of the polarisation analysis pipeline can be used to investigate the Milky Way magnetic field on projected scales of several arcminutes as well as the origin of the polarised emission in AGN and the properties of their host galaxies.
Ämnesord
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Nyckelord
- Surveys
- Galaxies: magnetic fields
- Methods: data analysis
- Polarization
- Galaxies: active
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Adebahr, B.
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Berger, A.
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Adams, E. A.K.
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Hess, K. M.
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de Blok, W.J.G.
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Dénes, H.
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visa fler...
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Moss, V. A.
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Schulz, R.
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van der Hulst, J ...
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Connor, L.
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Damstra, Sieds
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Hut, B.
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Ivashina, Marian ...
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Loose, G. M.
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Maan, Y.
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Mika,
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Mulder, H.
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Norden, M. J.
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Oostrum, L. C.
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Orrú, E.
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Ruiter, Mark
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Smits, R.
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van Cappellen, W ...
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van Leeuwen, J.
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Vermaas, N.
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Vohl, D.
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Ziemke, J.
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