Deep imaging of Fanaroff-Riley Class I radio galaxies with lobes

Abstract

We present deep, high-resolution imaging of the nearby Fanaroff-Riley Class I (FR I) radio galaxies NGC 193, B2 0206+35, B2 0755+37 and M 84 at frequencies of 4.9 and 1.4 GHz using new and archival multi-configuration observations from the Very Large Array. In addition, we describe lower-resolution observations of B2 0326+39 and a reanalysis of our published images of 3C 296. All of these radio galaxies show twin jets and well-defined lobes or bridges of emission, and we examine the common properties of this class of source. We show detailed images of total intensity, brightness gradient, spectral index, degree of polarization and projected magnetic-field direction. The jet bases are very similar to those in tailed twin-jet sources and show the characteristics of decelerating, relativistic flows. Except on one side of M 84, we find that the jets can be traced at least as far as the ends of the lobes, where they often form structures which we call "caps" with sharp outer brightness gradients. Continuing, but less well collimated flows back into the lobes from the caps can often be identified by their relatively flat spectral indices. The lobes in these radio galaxies are similar in morphology, spectral-index distribution and magnetic-field structure to those in more powerful (FR II) sources, but lack hot-spots or other evidence for strong shocks at the ends of the jets. M 84 may be an intermediate case between lobed and tailed sources, in which one jet does not reach the end of its lobe, but disrupts to form a "bubble".

21 pages, 12 figures, accepted for publication in MNRAS

References in corpus (9)

• An XMM-Newton study of the environments, particle content and impact of low-power radio galaxies
• FIRST `Winged' and `X'-shaped Radio Source Candidates
• A combined low-radio frequency/X-ray study of galaxy groups I. Giant Metrewave Radio Telescope observations at 235 MHz and 610 MHz
• In-depth Chandra study of the AGN feedback in Virgo elliptical galaxy M84
• Ordered magnetic fields around radio galaxies: evidence for interaction with the environment
• A relativistic model of the radio jets in 3C 296
• Multifrequency VLA observations of the FR I radio galaxy 3C 31: morphology, spectrum and magnetic field
• Aperture Synthesis Observations of the Nearby Spiral NGC 6503: Modeling the Thin and Thick HI Disks
• Line strengths of early-type galaxies

Cited by in corpus (28)

• Systematic properties of decelerating relativistic jets in low-luminosity radio galaxies
• Detection of a High Brightness Temperature Radio Core in the AGN-Driven Molecular Outflow Candidate NGC 1266
• Gemini GMOS and WHT SAURON integral-field spectrograph observations of the AGN driven outflow in NGC 1266
• Radio Galaxy Zoo: A Search for Hybrid Morphology Radio Galaxies
• Unveiling the cause of hybrid morphology radio sources (HyMoRS)
• LOFAR Observations of X-ray Cavity Systems
• The magnetized medium around the radio galaxy B2 0755+37: an interaction with the intra-group gas
• Radio spectral properties and jet duty cycle in the restarted radio galaxy 3C388
• The galaxy group NGC 507: newly detected AGN remnant plasma transported by sloshing
• The spectra of jet bases in FR I radio galaxies: implications for particle acceleration
• Young AGN outburst running over older X-ray cavities
• Chandra Early-Type Galaxy Atlas
• Fermi-LAT and Suzaku Observations of the Radio Galaxy Centaurus B
• Relativistic jet models for two low-luminosity radio galaxies: evidence for backflow?
• Filaments in the southern giant lobe of Centaurus A: constraints on nature and origin from modelling and GMRT observations
• Surface brightness discontinuities in radio halos. Insights from the MeerKAT Galaxy Cluster Legacy Survey
• Detection of an optical/UV jet/counterjet and Multiple Spectral Components in M84
• The Complex North Transition Region of Centaurus A: Radio Structure
• ViCTORIA project: The LOFAR HBA Virgo Cluster Survey
• Polarised structures in the radio lobes of B2 0258+35 - Evidence of magnetic draping?
• Orientation of the cores of hybrid morphology radio sources
• A rare example of low surface-brightness radio lobes in a gas-rich early-type galaxy: the story of NGC 3998
• The XXL Survey: XXXIV. Double irony in XXL-North. A tale of two radio galaxies in a supercluster at z = 0.14
• The twisted jets and magnetic fields of the extended radio galaxy 4C 70.19
• Centaurus A: constraints on the nature of the giant lobe filaments from XMM-Newton observations
• Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116+111
• The structure of the giant radio fossil in the Ophiuchus galaxy cluster
• MIGHTEE: total intensity radio continuum imaging and the COSMOS / XMM-LSS Early Science fields