The Complex North Transition Region of Centaurus A: Radio Structure

Abstract

We present deep radio images of the inner 50 kpc of Centaurus A, taken with the Karl G. Jansky Very Large Array (VLA) at 90cm. We focus on the Transition Regions between the inner galaxy - including the active nucleus, inner radio lobes, and star-forming disk - and the outer radio lobes. We detect previously unknown extended emission around the Inner Lobes, including radio emission from the star-forming disk. We find that the radio-loud part of the North Transition Region, known as the North Middle Lobe, is significantly overpressured relative to the surrounding ISM. We see no evidence for a collimated flow from the Active Galactic Nucleus (AGN) through this region. Our images show that the structure identified by Morganti et al. (1999) as a possible large-scale jet appears to be part of a narrow ridge of emission within the broader, diffuse, radio-loud region. This knotty radio ridge is coincident with other striking phenomena: compact X-ray knots, ionized gas filaments, and streams of young stars. Several short-lived phenomena in the North Transition Region, as well as the frequent re-energization required by the Outer Lobes, suggest that energy must be flowing through both Transition Regioins at the present epoch. We suggest that the energy flow is in the form of a galactic wind.

arXiv comment23 pages, 10 figures, accepted for publication in Astrophysical Journal. A version with higher quality figures may be found at http://www.aoc.nrao.edu/~fowen/papers/CenA/

References in corpus (27)

• The Luminosity Function of Young Star Clusters In "The Antennae" Galaxies (NGC 4038/4039)
• The 2-10 keV luminosity as a Star Formation Rate indicator
• M87 at 90cm: A Different Picture
• The Distance to NGC 5128 (Centaurus A)
• Minkowski's Object: A Starburst Triggered by a Radio Jet, Revisited
• Radiative Shock-Induced Collapse of Intergalactic Clouds
• X-ray emission from star-forming galaxies - III. Calibration of the Lx-SFR relation up to redshift z$\simeq$1.3
• High-energy particle acceleration at the radio-lobe shock of Centaurus A
• High-energy Particle Acceleration and Production of Ultra-high-energy Cosmic Rays in the Giant Lobes of Centaurus A
• Centaurus A: multiple outbursts or bursting bubble?
• Young Super Star Clusters in the Starburst of M82: The Catalogue
• Centaurus A: morphology and kinematics of the atomic hydrogen
• The nature of filamentary cold gas in the core of the Virgo Cluster
• Triggered star-formation in the inner filament of Centaurus A
• The Centaurus A Northern Middle Lobe as a Buoyant Bubble
• X-ray and Optical Filaments in M87
• The radio continuum structure of Centaurus A at 1.4 GHz
• Long Term Monitoring of the Dynamics and Particle Acceleration of Knots in the Jet of Centaurus A
• The Jet-Heated X-ray Filament in the Centaurus A Northern Middle Radio Lobe
• Dual-frequency VLBI study of Centaurus A on sub-parsec scales
• A Chandra Study of the Lobe/ISM Interactions Around the Inner Radio Lobes of Centaurus A: Constraints on the Temperature Structure and Transport Processes
• Deep Observation of the Giant Radio Lobes of Centaurus A with the Fermi Large Area Telescope
• Deep imaging of Fanaroff-Riley Class I radio galaxies with lobes
• Absorption of Nuclear Gamma-rays on the Starlight Radiation in FR I Sources: the Case of Centaurus A
• The Most Exciting Massive Binary Cluster in NGC 5128: Clues to the Formation of Globular Clusters
• The Complex North Transition Region of Centaurus A: A Galactic Wind
• The Dynamic Age of Centaurus A

Cited by in corpus (10)

• The extended halo of Centaurus A: uncovering satellites, streams, and substructures
• GLOSTAR -- Radio Source Catalog I: $28^{\circ }<\text{l}<36^{\circ }$ and $|b|<1^{\circ }$
• Multi-GPU maximum entropy image synthesis for radio astronomy
• The Complex North Transition Region of Centaurus A: A Galactic Wind
• The jet/wind outflow in Centaurus A: a local laboratory for AGN feedback
• UVIT view of Centaurus A; a detailed study on positive AGN feedback
• A 1D fluid model of the Centaurus A jet
• Centaurus A: constraints on the nature of the giant lobe filaments from XMM-Newton observations
• MICONIC: JWST/MIRI-MRS reveals heavily reprocessed PAH emission in the circum-nuclear disc of Centaurus A
• Explaining the UHECR spectrum, composition and large-scale anisotropies with radio galaxies