Editorial

Beck, Lauren

doi:10.1179/00822884.2015.1120420

Cited by 2 publications

(2 citation statements)

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“…By comparison, typical values for galactic disks are 10 −11 erg cm −3 (e.g. Beck 2007Beck , 2015 and are about 3 times larger in the central regions. Consequently, the value is high enough that the jet should propagate but not so high that it wouldn't be affected by the surrounding ISM, as the changes in orientation suggest.…”

Section: Interaction With the Ism And Physical Parametersmentioning

confidence: 94%

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

Irwin¹,

Schmidt²,

Damas-Segovia³

et al. 2016

Mon. Not. R. Astron. Soc.

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We report on C-band (5 -7 GHz) observations of the galaxy, NGC 2992, from the CHANG-ES sample. This galaxy displays an embedded nuclear double-lobed radio morphology within its spiral disk, as revealed in linearly polarized emission but not in total intensity emission. The radio lobes are kpc-sized, similar to what has been observed in the past for other Seyfert galaxies, and show ordered magnetic fields. NGC 2992 has shown previous evidence for AGN-related activity, but not the linearly polarized radio features that we present here. We draw attention to this galaxy as the first clear example (and prototype) of bipolar radio outflow that is revealed in linearly polarized emission only. Such polarization observations, which are unobscured by dust, provide a new tool for uncovering hidden weak AGN activity which may otherwise be masked by brighter unpolarized emission within which it is embedded. The radio lobes observed in NGC 2992 are interacting with the surrounding interstellar medium and offer new opportunities to investigate the interactions between nuclear outflows and the ISM in nearby galaxies. We also compare the radio emission with a new CHANDRA X-ray image of this galaxy. A new CHANG-ES image of NGC 3079 is also briefly shown as another example as to how much more obvious radio lobes appear in linear polarization as opposed to total intensity.

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Section: Interaction With the Ism And Physical Parametersmentioning

confidence: 94%

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

Irwin¹,

Schmidt²,

Damas-Segovia³

et al. 2016

Mon. Not. R. Astron. Soc.

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“…The strength of the vertical magnetic field is among many yet to be constrained in spiral galaxies (see, e.g., Beck 2016 for a summary). It has been observed in several edge-on galaxies showing the X-shaped pattern (see, e.g., Krause 2009;Beck 2015), but such observations have so far told us mostly only the existence and orientation of the field.…”

Section: Introductionmentioning

confidence: 99%

Study of the Vertical Magnetic Field in Face-on Galaxies Using Faraday Tomography

Ideguchi

Tashiro

Akahori

et al. 2017

ApJ

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Faraday tomography allows astronomers to probe the distribution of the magnetic field along the line of sight (LOS), but that can be achieved only after the Faraday spectrum is interpreted. However, the interpretation is not straightforward, mainly because the Faraday spectrum is complicated due to a turbulent magnetic field; it ruins the one-to-one relation between the Faraday depth and the physical depth, and appears as many small-scale features in the Faraday spectrum. In this paper, by employing "simple toy models" for the magnetic field, we describe numerically as well as analytically the characteristic properties of the Faraday spectrum. We show that the Faraday spectrum along "multiple LOSs" can be used to extract the global properties of the magnetic field. Specifically, considering face-on spiral galaxies and modeling turbulent magnetic field as a random field with a single coherence length, we numerically calculate the Faraday spectrum along a number of LOSs and its shape-characterizing parameters, that is, the moments. When multiple LOSs cover a region of (10 coherence length) 2 , the shape of the Faraday spectrum becomes smooth and the shape-characterizing parameters are well specified. With the Faraday spectrum constructed as a sum of Gaussian functions with different means and variances, we analytically show that the parameters are expressed in terms of the regular and turbulent components of the LOS magnetic field and the coherence length. We also consider the turbulent magnetic field modeled with a power-law spectrum, and study how the magnetic field is revealed in the Faraday spectrum. Our work suggests a way to obtain information on the magnetic field from a Faraday tomography study.

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Editorial

Cited by 2 publications

References 0 publications

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

Study of the Vertical Magnetic Field in Face-on Galaxies Using Faraday Tomography

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