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LOFAR Deep Fields: Probing faint Galactic polarised emission in ELAIS-N1
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- Šnidariać, Iva (författare)
- Ruder Boskovic Institute
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- Jeliać, Vibor (författare)
- Ruder Boskovic Institute
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- Mevius, M. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Brentjens, M. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Erceg, Ana (författare)
- Ruder Boskovic Institute
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- Shimwell, T. W. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Leiden (UL),Leiden University (UL)
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- Piras, Sara, 1991 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Horellou, Cathy, 1967 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sabater, J. (författare)
- University of Edinburgh
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- Best, P.N. (författare)
- University of Edinburgh
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Bracco, Andrea (författare)
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- Ceraj, L. (författare)
- Radboud Universiteit,Radboud University
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- Haverkorn, M. (författare)
- Radboud Universiteit,Radboud University
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- Oa'sullivan, Shane P. (författare)
- Dublin City University
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- Turiać, Luka (författare)
- Ruder Boskovic Institute
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- Vacca, V. (författare)
- Istituto nazionale di astrofisica (INAF)
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(creator_code:org_t)
- 2023-03-24
- 2023
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 674
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present the first deep polarimetric study of Galactic synchrotron emission at low radio frequencies. Our study is based on 21 observations of the European Large Area Infrared Space Observatory Survey-North 1 (ELAIS-N1) field using the Low-Frequency Array (LOFAR) at frequencies from 114.9 to 177.4 MHz. These data are a part of the LOFAR Two-metre Sky Survey Deep Fields Data Release 1. We used very low-resolution (4.3') Stokes QU data cubes of this release. We applied rotation measure (RM) synthesis to decompose the distribution of polarised structures in Faraday depth, and cross-correlation RM synthesis to align different observations in Faraday depth. We stacked images of about 150 h of the ELAIS-N1 observations to produce the deepest Faraday cube at low radio frequencies to date, tailored to studies of Galactic synchrotron emission and the intervening magneto-ionic interstellar medium. This Faraday cube covers ∼36 deg2 of the sky and has a noise of 27 μJy PSF-1 RMSF-1 in polarised intensity. This is an improvement in noise by a factor of approximately the square root of the number of stacked data cubes (√20), as expected, compared to the one in a single data cube based on five-to-eight-hour observations. We detect a faint component of diffuse polarised emission in the stacked cube, which was not detected previously. Additionally, we verify the reliability of the ionospheric Faraday rotation corrections estimated from the satellite-based total electron content measurements to be of ∼0.05 Cyrillic small letter GHEad m-2. We also demonstrate that diffuse polarised emission itself can be used to account for the relative ionospheric Faraday rotation corrections with respect to a reference observation.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
Nyckelord
- ISM: magnetic fields
- Techniques: polarimetric
- Radio continuum: ISM
- ISM: structure
- ISM: general
- Techniques: interferometric
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Šnidariać, Iva
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Jeliać, Vibor
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Mevius, M.
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Brentjens, M.
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Erceg, Ana
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Shimwell, T. W.
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visa fler...
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Piras, Sara, 199 ...
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Horellou, Cathy, ...
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Sabater, J.
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Best, P.N.
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Bracco, Andrea
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Ceraj, L.
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Haverkorn, M.
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Oa'sullivan, Sha ...
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Turiać, Luka
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Vacca, V.
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