The 'jet' rotation measure distribution and the optical absorption system near the Z = 1.953 quasar 3C 191

Kronberg, P. P.; Zukowski, Edwin L. H.; Perry, J. J.

doi:10.1086/185731

Cited by 26 publications

(27 citation statements)

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“…All of these showed some evidence for an increase in the observed RM of quasars at z k1. With somewhat better RM data, and with optical absorption line data for some quasars, it was found that high column density optical and H i absorption at intervening redshifts correlated with higher levels of observed RM (e.g., Kronberg & Perry 1982;Kronberg et al 1992;Oren & Wolfe 1995). This allowed some first estimates of magnetic field strengths in distant intervening galaxy systems.…”

Section: Introductionmentioning

confidence: 90%

“…Detailed RM images of individual quasars between z $ 1 and z $ 2 with companion absorption line data have established clear examples of component (2), e.g., PKS 1229À021 (Kronberg et al 1992) and of component (3), e.g., 3C 191 at z s ¼ 1:95, which contains intrinsic RM variations at $z s on the order of 2000 rad m À2 (Kronberg et al 1990). These studies probed the intervening Faraday-active gas by analyzing both optical absorption lines and Faraday rotation images.…”

Section: Introductionmentioning

confidence: 99%

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A Global Probe of Cosmic Magnetic Fields to High Redshifts

Kronberg

Bernet

Miniati

et al. 2008

ApJ

163

181

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Faraday rotation (rotation measure [RM]) probes of magnetic fields in the universe are sensitive to cosmological and evolutionary effects as z increases beyond $1 because of the scalings of electron density and magnetic fields, and the growth in the number of expected intersections with galaxy-scale intervenors, dN /dz. In this new global analysis of an unprecedented large sample of RMs of high-latitude quasars extending out to z $ 3:7, we find that the distribution of RM broadens with redshift in the 20Y80 rad m À2 range, despite the (1 þ z) À2 wavelength dilution expected in the observed Faraday rotation. Our results indicate that the universe becomes increasingly ''Faraday-opaque'' to sources beyond z $ 2; that is, as z increases, progressively fewer sources are found with a ''small'' RM in the observer's frame. This is in contrast to sources at z P1. They suggest that the environments of galaxies were significantly magnetized at high redshifts, with magnetic field strengths that were at least as strong within a few Gyr of the big bang as at the current epoch. We separately investigate a simple unevolving toy model in which the RM is produced by Mg ii absorber systems, and find that it can approximately reproduce the observed trend with redshift. An additional possibility is that the intrinsic RM associated with the radio sources was much higher in the past, and we show that this is not a trivial consequence of the higher radio luminosities of the high-redshift sources.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

A Global Probe of Cosmic Magnetic Fields to High Redshifts

Kronberg

Bernet

Miniati

et al. 2008

ApJ

163

181

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“…The optical spectral index, αopt = 0.7, indicates that there is little reddening along our line-of-sight to 3C 191; dust may have been destroyed in shocks due to the advancing radio source (Willott et al 2002). 3C 191 has a residual rotation measure, which is defined as the rotation measure of the source minus the Galactic rotation measure in that direction, of 1700 rad m −2 (Kronberg et al 1990). This is two orders of magnitude larger than other quasars with com- Table 3.…”

Section: C 191mentioning

confidence: 99%

Extended Inverse-Compton Emission from Distant, Powerful Radio Galaxies

Erlund

Fabian

Blundell

et al.

ESO Astrophysics Symposia

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We present Chandra observations of two relatively high redshift FR II radio galaxies, 3C 432 and 3C 191 (z = 1.785 and z = 1.956 respectively), both of which show extended X-ray emission along the axis of the radio jet or lobe. This X-ray emission is most likely to be due to inverse-Compton scattering of Cosmic Microwave Background (CMB) photons. Under this assumption we estimate the minimum energy contained in the particles responsible. This can be extrapolated to determine a rough estimate of the total energy. We also present new, deep radio observations of 3C 294, which confirm some association between radio and X-ray emission along the NE-SW radio axis and also that radio emission is not detected over the rest of the extent of the diffuse X-ray emission. This, together with the offset between the peaks of the X-ray and radio emissions may indicate that the jet axis in this source is precessing.

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“…Magnetic fields with the field strength ∼ 10 −6 G on a 1 − 10kpc scale have been observed in galaxies of all types, galaxies at cosmological distances [1], and clusters of galaxies (for detailed reviews, see [2][3][4][5][6][7][8]). Moreover, the field strength of magnetic fields in clusters of galaxies is estimated at 10 −7 − 10 −6 G and the scale is estimated at 10kpc−1Mpc scale [9].…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper we consider the interrelation between the generation of large-scale 1 In Ref. [24], the breaking of conformal flatness of the FRW metric induced by the evolution of scalar metric perturbations at the end of inflation has been discussed.…”

Section: Introductionmentioning

confidence: 99%

The interrelation between the generation of large-scale electric fields and that of large-scale magnetic fields during inflation

Bamba¹

2007

J. Cosmol. Astropart. Phys.

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The interrelation between the generation of large-scale electric fields and that of large-scale magnetic fields due to the breaking of the conformal invariance of the electromagnetic field in inflationary cosmology is studied. It is shown that if large-scale magnetic fields with a sufficiently large amplitude are generated during inflation, the generation of large-scale electric fields is suppressed, and vice versa. Furthermore, a physical interpretation of the result and its cosmological significance are considered.

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The 'jet' rotation measure distribution and the optical absorption system near the Z = 1.953 quasar 3C 191

Cited by 26 publications

References 0 publications

A Global Probe of Cosmic Magnetic Fields to High Redshifts

A Global Probe of Cosmic Magnetic Fields to High Redshifts

Extended Inverse-Compton Emission from Distant, Powerful Radio Galaxies

The interrelation between the generation of large-scale electric fields and that of large-scale magnetic fields during inflation

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