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The PARADIGM projec...
The PARADIGM project I: a multiscale radio morphological analysis of local U/LIRGS
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- Lucatelli, Geferson (author)
- University of Manchester
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- Beswick, R. J. (author)
- University of Manchester
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- Moldon, J. (author)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA),University of Manchester
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- Pérez-Torres, M.A. (author)
- Universidad de Zaragoza,University of Zaragoza,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA),European University Cyprus
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- Conway, John, 1963 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Alberdi, Antxon (author)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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- Romero-Cañizales, C. (author)
- Academia Sinica Taiwan
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- Varenius, Eskil, 1986 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Klockner, H. R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Barcos-Munoz, Loreto (author)
- University of Virginia,National Radio Astronomy Observatory
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- Bondi, M. (author)
- Istituto di Radioastronomia
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- Garrington, Simon T. (author)
- University of Manchester
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Baan, Willem A. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Pihlstrom, Y. (author)
- University of New Mexico,National Radio Astronomy Observatory
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 529:4, s. 4468-4499
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Abstract
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- Disentangling the radio flux contribution from star formation (SF) and active-galactic-nuclei (AGNs) activity is a long-standing problem in extragalactic astronomy, since at frequencies of 10 GHz, both processes emit synchrotron radiation. We present in this work the general objectives of the PARADIGM (PAnchromatic high-Resolution Analysis of DIstant Galaxy Mergers) project, a multi-instrument concept to explore SF and mass assembly of galaxies. We introduce two novel general approaches for a detailed multiscale study of the radio emission in local (ultra) luminous infrared galaxies (U/LIRGs). In this work, we use archival interferometric data from the Very Large Array (VLA) centred at ∼6 GHz (C band) and present new observations from the e-Multi-Element Radio-Linked Interferometer Network (e-MERLIN) for UGC 5101, VV 705, VV 250, and UGC 8696. Using our image decomposition methods, we robustly disentangle the radio emission into distinct components by combining information from the two interferometric arrays. We use e-MERLIN as a probe of the core-compact radio emission (AGN or starburst) at ∼20 pc scales, and as a probe of nuclear diffuse emission, at scales ∼100-200 pc. With VLA, we characterize the source morphology and the flux density on scales from ∼200 pc up to and above 1 kpc. As a result, we find deconvolved and convolved sizes for nuclear regions from ∼10 to ∼200 pc. At larger scales, we find sizes of 1.5-2 kpc for diffuse structures (with effective sizes of ∼300-400 pc). We demonstrate that the radio emission from nuclear extended structures (∼100 pc) can dominate over core-compact components, providing a significant fraction of the total multiscale SF output. We establish a multiscale radio tracer for SF by combining information from different instruments. Consequently, this work sets a starting point to potentially correct for overestimations of AGN fractions and underestimates of SF activity.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- techniques: interferometric
- galaxies: star formation
- galaxies: starburst
- radio continuum: galaxies
- techniques: image processing
- galaxies: nuclei
Publication and Content Type
- art (subject category)
- ref (subject category)
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Lucatelli, Gefer ...
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Beswick, R. J.
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Moldon, J.
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Pérez-Torres, M. ...
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Conway, John, 19 ...
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Alberdi, Antxon
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Romero-Cañizales ...
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Varenius, Eskil, ...
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Klockner, H. R.
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Barcos-Munoz, Lo ...
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Bondi, M.
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Garrington, Simo ...
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Aalto, Susanne, ...
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Baan, Willem A.
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Pihlstrom, Y.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Monthly Notices ...
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Chalmers University of Technology