Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/research/cena/documents/presentations/ekers.pdf Дата изменения: Thu Jul 16 04:36:32 2009 Дата индексирования: Fri Nov 27 01:54:59 2009 Кодировка: Поисковые слова: с р р с с рер рес с с р р р р р рер р р рер

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






Cooper Price and Cole 1965
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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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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
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600kpc

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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
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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