The extremely asymmetric radio structure of the z=3.1 radio galaxy B3 J2330+3927

Details The extremely asymmetric radio structure of the z=3.1 radio galaxy B3 J2330+3927 The extremely asymmetric radio structure of the z=3.1 radio galaxy B3 J2330+3927

2005-07-20

arxiv.org/abs/astro-ph/0507489v1

Mon.Not.Roy.Astron.Soc.Lett.363:L41-L45,2005

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, to appear as a Letter to MNRAS

Scientific paper

10.1111/j.1745-3933.2005.00080.x

We report on 1.7 and 5.0 GHz observations of the z=3.087 radio galaxy B3 J2330+3927, using the Very Long Baseline Array (VLBA), and archival 1.4 and 8.4 GHz Very Large Array (VLA) data. Our VLBA data identify a compact, flat spectrum (\alpha_{1.7 GHz}^{5 GHz} = -0.2 +/- 0.1; S_\nu ~ \nu^\alpha) radio component as the core. The VLA images show that the fraction of core emission is very large (f_c \approx 0.5 at 8.4 GHz), and reveal a previously undetected, very faint counterjet, implying a radio lobe flux density ratio R >= 11 and a radio lobe distance ratio Q \approx 1.9. Those values are much more common in quasars than in radio galaxies, but the optical/near-IR spectra show a clear type II AGN for B3 J2330+3927, confirming that it is indeed a radio galaxy. Unlike all other radio galaxies, the bright Ly-\alpha emitting gas is located towards the furthest radio arm. We argue against environmental and relativistic beaming effects being the cause of the observed asymmetry, and suggest this source has intrinsically asymmetric radio jets. If this is the case, B3 J2330+3927 is the first example of such a source at high redshift, and seems to be difficult to reconcile with the unified model, which explains the differences between quasars and radio galaxies as being due to orientation effects.

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