Warped diffusive radio halo around the quiescent spiral edge-on galaxy NGC 4565

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Warped diffusive radio halo around the quiescent spiral edge-on galaxy NGC 4565

Heesen, V (author): Universität Hamburg,University of Hamburg

Whitler, L. (author): Arizona State University

Schmidt, P. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Miskolczi, A. (author): Ruhr-Universität Bochum

Sridhar, S. S. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Horellou, Cathy, 1967 (author): Chalmers tekniska högskola,Chalmers University of Technology

Beck, R. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Gurkan, G. (author): Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Scannapieco, E. (author): Arizona State University

Bruggen, M. (author): Universität Hamburg,University of Hamburg

Heald, G. H. (author): Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Krause, M. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Paladino, R. (author): Istituto nazionale di astrofisica (INAF)

Nikiel-Wroczynski, B. (author): Jagiellonian University in Kraków, Poland,Universiteit Leiden (UL),Leiden University (UL)

Wilber, A. (author): Universität Hamburg,University of Hamburg

Dettmar, R-J (author): Ruhr-Universität Bochum

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(creator_code:org_t)

2019-08-05
2019
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 628

Related links:: https://research.cha... (primary) (free); show more...; https://www.aanda.or...; https://research.cha...; https://research.cha...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Context . Cosmic rays play a pivotal role in launching galactic winds, particularly in quiescently star-forming galaxies where the hot gas alone is not sufficient to drive a wind. Except for the Milky Way, not much is known about the transport of cosmic rays in galaxies. Aims. In this Letter, we present low-frequency observations of the nearby edge-on spiral galaxy NGC 4565 using the LOw-Frequency ARray (LOFAR). With our deep 144 MHz observations, we obtain a clean estimate of the emission originating from old cosmic-ray electrons (CRe), which is almost free from contamination by thermal emission. Methods . We measured vertical profiles of the non-thermal radio continuum emission that we fitted with Gaussian and exponential functions. The different profile shapes correspond to 1D cosmic-ray transport models of pure diffusion and advection, respectively. Results. We detect a warp in the radio continuum that is reminiscent of the previously known H I warp. Because the warp is not seen at GHz-frequencies in the radio continuum, its minimum age must be about 100 Myr. The warp also explains the slight flaring of the thick radio disc that can otherwise be well described by a Gaussian profile with an FWHM of 65 arcsec (3.7 kpc). Conclusions . The diffusive radio halo together with the extra-planar X-ray emission may be remnants of enhanced star-forming activity in the past where the galaxy had a galactic wind, as GHz-observations indicate only a weak outflow in the last 40 Myr. NGC 4565 could be in transition from an outflow-to an inflow-dominated phase.

Subject headings

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

galaxies: magnetic fields
cosmic rays
galaxies: halos
galaxies: individual: NGC 4565
galaxies: spiral
radio continuum: galaxies

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By the author/editor: Heesen, V; Whitler, L.; Schmidt, P.; Miskolczi, A.; Sridhar, S. S.; Horellou, Cathy, ...; show more...; Beck, R.; Gurkan, G.; Scannapieco, E.; Bruggen, M.; Heald, G. H.; Krause, M.; Paladino, R.; Nikiel-Wroczynsk ...; Wilber, A.; Dettmar, R-J; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Fusion Plasma an ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

Articles in the publication: Astronomy and As ...

By the university: Chalmers University of Technology

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