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The radio continuum view of Centaurus A
Ron Ekers CSIRO The Many Faces of Centaurus A Sydney, 29 June 2009

Ilana's composite
Morganti et al. 1999

9°

10'

Burns et al. xx

image courtesy Norbert Junkes (MPIfR)

Why Centaurus A is special
s s s s s s s

the first extragalactic radio source the brightest source in the Southern Hemisphere the second double lobed source discovered
after Cygnus A

the closest Radio Galaxy the closest AGN the closest SMBH
VLBI resolution 0.01pc, 100 Rs

A spectacular galaxy

Evolution of the Models
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Radio sources
Static magnetic field 1960 Evolutionary sequence 1970 Continuous injection Continuous reacceleration

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Energy source
Galaxy collisions 1950's Nuclear accretions 1960 Accretion triggered by collisions 1980

Centaurus A the closest AGN
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Distance 3.4Mpc Next closest comparable AGN M87 17Mpc ! Average distance to a L=1024 W Hz1 radio galaxies
10Mpc So we are lucky (or influenced!)

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Much easier to study at all wavelengths Subtends a large angular size
Good linear resolution Background probes

Some Radio Galaxies
Name Size (kpc) 470 200 80 1

Centaurus A Cygnus A M87 M82

Log Luminosity (ergs sec1) 41.7 45.2 42.0 39.5

Log Energy (ergs) 59.9 60.6 58.6 55.2

Polarization in Centaurus A
s s s

April 1962 Parkes 64m just completed Discovered by Bracewell
Published Cooper and Price Visitors Log Not a National Facilities yet!

Bracewell 1962

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Connie Mayer
Found Cygnus A polarization a few weeks earlier

North Goobang Philosophical Society Mark Price 1961

Discovery of Faraday Rotation Centaurus A Parkes 64m
s s s s

Cooper and Price Nature Sep 1962 10 20cm Faraday Rotation
120o

Cooper Price and Cole 1965
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s s s

s s

Aust J Phys, 18, 589 (1965) Parkes 64m 11, 21, 31, 75cm Spectral index 0.6 whole source Polarization up to 40% RM 36 to 84 rad m2

Haslam 408MHz

Haslam 408MHz

HIPASS Continuum

Preliminary continuum image, courtesy Mark Calabretta (CSIRO ATNF)

HI Parkes All Sky Survey Barnes et al. 2001
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s s

s

Observations 1997 to 2000 8° scans of 9 minutes Mark Calabretta (ATNF) processing continuum incl. HI Zone of Avoidance Juraszek et al 2000

Preliminary continuum image, courtesy Mark Calabretta (CSIFea ATNF)9 RO in 200

Parkes 6cm Norbert Junkes
Intensity Polarization

600kpc ???

Centaurus A
ATCA Mosaic
s s

600kpc

s s s s s

1.4GHz continuum full polarization 4 x 750m array configuration 406 pointings, hexagonal grid FOV 45 deg2 ~45''

~0.26mJy/beam (0.1K)

sI

lana Feain last talk!

Centaurus A composite

Radio Optical alignment

Radio

Radio Optical alignment Precession?
Optical

150kpc

60kpc

Cannon, UK Schmidt IIIaJ

[How] does radio plasma couple to the IGM/ISM?
CO blue stars

Charmandaris+00

Graham & Fassett 02

30kpc

Oosterloo+05

Star Formation Centaurus A middle lobe
Oosterloo
Galex UV

15kpc

Thermal Xray in the Middle Lobe
Oosterloo

15kpc

Kraft et al ApJ 698 (2009) 2036

Centaurus A composite

Inner double lobe VLA 5GHz

7 kpc

Inner double lobe

7 kpc

Centaurus A composite

Centaurus A the closest AGN jet
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ATCA 5GHz
Hardcastle 2003

1 kpc

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Chandra Xray
Kraft 2002 1" = 17pc

3pc

Centaurus A the Asymmetry Enigma

Many scales of Centaurus A
600kpc 0.01pc = 108 : 1
s s

Mpc overall shape modified by dynamical changes? 100Kpc middle lobe bubbles, starformation, channels

jet induced star formation We cant understand the physics of black hole regulation and feedback except in the very closest objects.

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10kpc central double 1kpc jet 0.01pc VLBI jet

closest so best resolution Xray radio One sidedness Doppler, flipflop, environment SMBH effects, accretion disk, BH merger kicks

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Parkes Norbert Junkes

600kpc

image courtesy Norbert Junkes (MPIfR)

Feain 2009

Junkes to Feain

150kpc