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Unveiling the 100 pc scale nuclear radio structure of NGC6217 with e-MERLIN and the VLA

Unveiling the 100 pc scale nuclear radio structure of NGC6217 with e-MERLIN and the VLA
Unveiling the 100 pc scale nuclear radio structure of NGC6217 with e-MERLIN and the VLA

We present high-sensitivity 1.51 GHz e-MERLIN (e-Multi-Element Radio-Linked Interferometer Network) radio images of the nearby galaxy NGC6217. We resolve the compact radio source at the centre of NGC6217 for the first time, finding a twin-lobed structure with a total linear size of ~4 arcsec (~400 pc). The radio source does not have a compact central core, but there is an unresolved hotspot near the outer edge of the southern lobe. Combining our e-MERLIN data with new VLA (Very Large Array) A-Array data and archival multiwavelength data, we explore possible scenarios which might explain this complex radio morphology. We conclude that this radio source is most likely powered by a low-luminosity active galactic nucleus but with a possible important contribution from nuclear star formation. We also investigate the origin of a putative X-ray jet in NGC6217, previously suggested in the literature. This 'jet' consists of three X-ray 'knots' in a line, pointed away from the nucleus, with a total size of ~3 arcmin (~15 kpc).We find no extended radio emission coincident with the 'jet'. An additional compact radio source, aligned with the knots but without an X-ray counterpart is detected. We detect infrared/optical sources falling within the X-ray extraction regions of the 'knots', but note that these sources could be chance associations due to high source density around the target field and we estimate the probability of three randomly aligned X-ray sources to be 0.3 per cent in this field.

Galaxies: active, Galaxies: jets, Radio continuum: galaxies, X-rays: galaxies
0035-8711
4962-4979
Williams, D. R.
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McHardy, I. M.
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Baldi, R. D.
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Beswick, R. J.
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Pahari, M.
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Argo, M. K.
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Beri, A.
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Boorman, P.
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Brinks, E.
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Dullo, B. T.
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Fenech, D. M.
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Ineson, J.
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Kharb, P.
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Knapen, J. H.
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Muxlow, T. W.B.
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Westcott, J.
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Williams, D. R.
c17d8b60-4a56-436b-b75c-3786a0a113ab
McHardy, I. M.
4f215137-9cc4-4a08-982e-772a0b24c17e
Baldi, R. D.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Beswick, R. J.
d3f37275-1f32-4ba3-a745-7dab2d21da60
Pahari, M.
2fca833b-1533-41ad-a077-5132a5fc4574
Argo, M. K.
4099113a-b9c5-457a-b7b3-8e8cdfc71e11
Beri, A.
69ed346a-f02a-4243-83f9-ad5ab4c4008c
Boorman, P.
e5240793-37c1-4b7b-9840-3b996cef8dd3
Brinks, E.
095e592f-8325-418c-b00c-d9e783fd5703
Dullo, B. T.
ae12129a-e3e0-4628-a208-cb5f4b329baf
Fenech, D. M.
3b633567-2827-4698-a086-d93457039a79
Ineson, J.
2786e312-601a-4387-bb3d-deda0a05219f
Kharb, P.
3c137335-5e0e-40f4-b09b-cb330656d98a
Knapen, J. H.
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Muxlow, T. W.B.
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Westcott, J.
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Williams, D. R., McHardy, I. M., Baldi, R. D., Beswick, R. J., Pahari, M., Argo, M. K., Beri, A., Boorman, P., Brinks, E., Dullo, B. T., Fenech, D. M., Ineson, J., Kharb, P., Knapen, J. H., Muxlow, T. W.B. and Westcott, J. (2019) Unveiling the 100 pc scale nuclear radio structure of NGC6217 with e-MERLIN and the VLA. Monthly Notices of the Royal Astronomical Society, 486 (4), 4962-4979. (doi:10.1093/mnras/stz1135).

Record type: Article

Abstract

We present high-sensitivity 1.51 GHz e-MERLIN (e-Multi-Element Radio-Linked Interferometer Network) radio images of the nearby galaxy NGC6217. We resolve the compact radio source at the centre of NGC6217 for the first time, finding a twin-lobed structure with a total linear size of ~4 arcsec (~400 pc). The radio source does not have a compact central core, but there is an unresolved hotspot near the outer edge of the southern lobe. Combining our e-MERLIN data with new VLA (Very Large Array) A-Array data and archival multiwavelength data, we explore possible scenarios which might explain this complex radio morphology. We conclude that this radio source is most likely powered by a low-luminosity active galactic nucleus but with a possible important contribution from nuclear star formation. We also investigate the origin of a putative X-ray jet in NGC6217, previously suggested in the literature. This 'jet' consists of three X-ray 'knots' in a line, pointed away from the nucleus, with a total size of ~3 arcmin (~15 kpc).We find no extended radio emission coincident with the 'jet'. An additional compact radio source, aligned with the knots but without an X-ray counterpart is detected. We detect infrared/optical sources falling within the X-ray extraction regions of the 'knots', but note that these sources could be chance associations due to high source density around the target field and we estimate the probability of three randomly aligned X-ray sources to be 0.3 per cent in this field.

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Accepted/In Press date: 14 April 2019
e-pub ahead of print date: 30 April 2019
Published date: July 2019
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Galaxies: active, Galaxies: jets, Radio continuum: galaxies, X-rays: galaxies

Identifiers

Local EPrints ID: 432464
URI: http://eprints.soton.ac.uk/id/eprint/432464
ISSN: 0035-8711
PURE UUID: 0d1bc2db-b1b3-4cc5-9a01-71fac2020189
ORCID for P. Boorman: ORCID iD orcid.org/0000-0001-9379-4716

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Date deposited: 16 Jul 2019 16:30
Last modified: 24 Jan 2020 17:34

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Contributors

Author: D. R. Williams
Author: I. M. McHardy
Author: R. D. Baldi
Author: R. J. Beswick
Author: M. Pahari
Author: M. K. Argo
Author: A. Beri
Author: P. Boorman ORCID iD
Author: E. Brinks
Author: B. T. Dullo
Author: D. M. Fenech
Author: J. Ineson
Author: P. Kharb
Author: J. H. Knapen
Author: T. W.B. Muxlow
Author: J. Westcott

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