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LOFAR discovery and...
LOFAR discovery and wide-band characterisation of an ultra-steep spectrum AGN radio remnant associated with Abell 1318
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- Shulevski, A. (author)
- Rijksuniversiteit Groningen,University of Groningen,Anton Pannekoek Institute for Astronomy,Universiteit Leiden (UL),Leiden University (UL)
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- Brienza, M. (author)
- Istituto nazionale di astrofisica (INAF),Universita di Bologna,University of Bologna
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- Massaro, F. (author)
- Universita degli Studi di Torino,University of Turin
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- Morganti, R. (author)
- Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen
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- Intema, H. T. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Oosterloo, T. (author)
- Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON)
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- De Gasperin, F. (author)
- Universität Hamburg,University of Hamburg,Istituto di Radioastronomia
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- Rajpurohit, K. (author)
- Harvard-Smithsonian Center for Astrophysics,Universita di Bologna,University of Bologna,Istituto di Radioastronomia
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- Pasini, T. (author)
- Universität Hamburg,University of Hamburg
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- Kutkin, A. M. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Vohl, D. (author)
- Anton Pannekoek Institute for Astronomy
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- Adams, Elizabeth A.K. (author)
- Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen
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- Adebahr, B. (author)
- Ruhr-Universität Bochum
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- Brueggen, M. (author)
- Universität Hamburg,University of Hamburg
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- Hess, Kelley Michelle, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA),Netherlands Institute for Radio Astronomy (ASTRON)
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- Loose, M. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Oostrum, L. C. (author)
- Netherlands Institute for Radio Astronomy (ASTRON),Netherlands eScience Center
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- Ziemke, J. (author)
- Netherlands Institute for Radio Astronomy (ASTRON),Universitetet i Oslo,University of Oslo
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 682
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- We present the discovery of a very extended (550 kpc) and low-surface-brightness (3.3 µJy arcsec−2 at 144 MHz) radio emission region in Abell 1318. These properties are consistent with its characterisation as an active galactic nucleus (AGN) remnant radio plasma, based on its morphology and radio spectral properties. We performed a broad-band (54–1400 MHz) radio spectral index and curvature analysis using LOFAR, uGMRT, and WSRT-APERTIF data. We also derived the radiative age of the detected emission, estimating a maximum age of 250 Myr. The morphology of the source is remarkably intriguing, with two larger, oval-shaped components and a thinner, elongated, and filamentary structure in between, plausibly reminiscent of two aged lobes and a jet. Based on archival Swift as well as SDSS data we performed an X-ray and optical characterisation of the system, whose virial mass was estimated to be ∼7.4 × 1013 M. This places A1318 in the galaxy group regime. Interestingly, the radio source does not have a clear optical counterpart embedded in it, thus, we propose that it is most likely an unusual AGN remnant of previous episode(s) of activity of the AGN hosted by the brightest group galaxy (∼2.6 × 1012 M), which is located at a projected distance of ∼170 kpc in the current epoch. This relatively high offset may be a result of IGrM sloshing sourced by a minor merger. The filamentary morphology of the source may suggest that the remnant plasma has been perturbed by the system dynamics, however, only future deeper X-ray observations will be able to address this question.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: active
- radio continuum: galaxies
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Shulevski, A.
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Brienza, M.
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Massaro, F.
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Morganti, R.
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Intema, H. T.
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Oosterloo, T.
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show more...
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De Gasperin, F.
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Rajpurohit, K.
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Pasini, T.
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Kutkin, A. M.
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Vohl, D.
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Adams, Elizabeth ...
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Adebahr, B.
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Brueggen, M.
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Hess, Kelley Mic ...
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Loose, M.
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Oostrum, L. C.
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Ziemke, J.
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- About the subject
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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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Astronomy and As ...
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Chalmers University of Technology