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Jets, arcs and shocks: NGC 5195 at radio wavelengths

Jets, arcs and shocks: NGC 5195 at radio wavelengths
Jets, arcs and shocks: NGC 5195 at radio wavelengths
We studied the nearby, interacting galaxy NGC 5195 (M51b) in the radio, optical and X-ray bands. We mapped the extended, low-surface-brightness features of its radio-continuum emission; determined the energy content of its complex structure of shock-ionized gas; constrained the current activity level of its supermassive nuclear black hole. In particular, we combined data from the European Very Long Baseline Interferometry Network (~1-pc scale), from our new e-MERLIN observations (~10-pc scale), and from the Very Large Array (~100-1000-pc scale), to obtain a global picture of energy injection in this galaxy. We put an upper limit to the luminosity of the (undetected) flat-spectrum radio core. We find steep-spectrum, extended emission within 10 pc of the nuclear position, consistent with optically-thin synchrotron emission from nuclear star formation or from an outflow powered by an active galactic nucleus (AGN). A linear spur of radio emission juts out of the nuclear source towards the kpc-scale arcs (detected in radio, Halpha and X-ray bands). From the size, shock velocity, and Balmer line luminosity of the kpc-scale bubble, we estimate that it was inflated by a long-term-average mechanical power ~3-6 x 10^{41} erg/s over the last 3-6 Myr. This is an order of magnitude more power than can be provided by the current level of star formation, and by the current accretion power of the supermassive black hole. We argue that a jet-inflated bubble scenario associated with previous episodes of AGN activity is the most likely explanation for the kpc-scale structures.
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
0035-8711
2876–2889
Rampadarath, H.
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Soria, R.
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Urquhart, R.
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Argo, M.K.
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Brightman, M.
eb110ae1-9a2c-4968-b9ef-e7955feba535
Lacey, C.K.
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Schlegel, E.M.
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Beswick, R.J.
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Baldi, R.D.
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Muxlow, T.W.B.
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McHardy, I.M.
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Williams, D.R.A.
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Dumas, G.
4f7e1039-7d0c-4005-a2e7-254c1b157d89
Rampadarath, H.
fae44b6e-3763-41fd-b347-00ec51dfa555
Soria, R.
56ae49f7-b9b8-4eed-bae0-3947ea14ec19
Urquhart, R.
9e0677d9-e75d-4a77-97d6-ad00f33b0a48
Argo, M.K.
f4fd7615-6b60-44f4-97aa-993c91e56a9b
Brightman, M.
eb110ae1-9a2c-4968-b9ef-e7955feba535
Lacey, C.K.
9a11274b-0347-4e0f-a4ab-191939c36627
Schlegel, E.M.
909204d1-0a84-4ea5-af3c-03298eb56904
Beswick, R.J.
c52c991a-7404-4b9c-b651-b919a8d02c04
Baldi, R.D.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Muxlow, T.W.B.
72c8c206-cfe8-425c-9f9c-256dbf2f56c1
McHardy, I.M.
4f215137-9cc4-4a08-982e-772a0b24c17e
Williams, D.R.A.
c9ded967-198f-4c26-96b1-8c03d7d26445
Dumas, G.
4f7e1039-7d0c-4005-a2e7-254c1b157d89

Rampadarath, H., Soria, R., Urquhart, R., Argo, M.K., Brightman, M., Lacey, C.K., Schlegel, E.M., Beswick, R.J., Baldi, R.D., Muxlow, T.W.B., McHardy, I.M., Williams, D.R.A. and Dumas, G. (2018) Jets, arcs and shocks: NGC 5195 at radio wavelengths. Monthly Notices of the Royal Astronomical Society, 476 (3), 2876–2889. (doi:10.1093/mnras/sty390).

Record type: Article

Abstract

We studied the nearby, interacting galaxy NGC 5195 (M51b) in the radio, optical and X-ray bands. We mapped the extended, low-surface-brightness features of its radio-continuum emission; determined the energy content of its complex structure of shock-ionized gas; constrained the current activity level of its supermassive nuclear black hole. In particular, we combined data from the European Very Long Baseline Interferometry Network (~1-pc scale), from our new e-MERLIN observations (~10-pc scale), and from the Very Large Array (~100-1000-pc scale), to obtain a global picture of energy injection in this galaxy. We put an upper limit to the luminosity of the (undetected) flat-spectrum radio core. We find steep-spectrum, extended emission within 10 pc of the nuclear position, consistent with optically-thin synchrotron emission from nuclear star formation or from an outflow powered by an active galactic nucleus (AGN). A linear spur of radio emission juts out of the nuclear source towards the kpc-scale arcs (detected in radio, Halpha and X-ray bands). From the size, shock velocity, and Balmer line luminosity of the kpc-scale bubble, we estimate that it was inflated by a long-term-average mechanical power ~3-6 x 10^{41} erg/s over the last 3-6 Myr. This is an order of magnitude more power than can be provided by the current level of star formation, and by the current accretion power of the supermassive black hole. We argue that a jet-inflated bubble scenario associated with previous episodes of AGN activity is the most likely explanation for the kpc-scale structures.

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Accepted/In Press date: 12 February 2018
e-pub ahead of print date: 19 February 2018
Published date: 21 May 2018
Keywords: Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena

Identifiers

Local EPrints ID: 418207
URI: http://eprints.soton.ac.uk/id/eprint/418207
ISSN: 0035-8711
PURE UUID: baa6beaf-4915-412f-83ae-6e54a4e82490
ORCID for D.R.A. Williams: ORCID iD orcid.org/0000-0001-7361-0246

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Date deposited: 23 Feb 2018 17:30
Last modified: 16 Dec 2019 18:26

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Contributors

Author: H. Rampadarath
Author: R. Soria
Author: R. Urquhart
Author: M.K. Argo
Author: M. Brightman
Author: C.K. Lacey
Author: E.M. Schlegel
Author: R.J. Beswick
Author: R.D. Baldi
Author: T.W.B. Muxlow
Author: I.M. McHardy
Author: D.R.A. Williams ORCID iD
Author: G. Dumas

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