black holes in the early universe accretion and feedback
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Black Holes in the Early Universe Accretion and Feedback. Geoff Bicknell & Alex Wagner Research School of Astronomy & Astrophysics Australian National University. High redshift radio galaxies: AGN Feedback. z=2.42 radio galaxy MRC0406-244 Nesvadba et al. 2009. - PowerPoint PPT PresentationTRANSCRIPT
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Black Holes in the Early Universe
Accretion and Feedback
Geoff Bicknell & Alex Wagner
Research School of Astronomy & AstrophysicsAustralian National University
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2Research School of Astronomy & Astrophysics
High redshift radio galaxies: AGN Feedback
z=2.42 radio galaxy MRC0406-244
Nesvadba et al. 2009
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Feedback from radio galaxies at z ~1-3 requires black holes ~ 109 solar masses
What is the origin of these black holes?
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4Research School of Astronomy & Astrophysics
Black holes in the early universe
Fan 2006: The discovery of luminous quasars in SDSS at z > 6 indicates the existence billion-solar-mass black holes at the end of reionization epoch.
Comoving spatial density of quasars at M1450 < -26.7
Fan 2006, New Astr. Rev. 50, 665
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Black hole masses
Distribution of black hole masses for z>3
From Fan, 2006
Black hole masses up to ~ 1010 solar masses
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Dust-free quasars – further evidence of evolution
Jiang, Fan, Brandt et al.Nature 2010
Disk emissionDust emissionLow z quasars
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Correlation between dust and black hole mass
•Correlation between measure of dust and black hole mass
• Formation of dust in quasar outflows? (Elvis et al. 2007)
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Alternative to quasar outflow model
Gall, Anderson and Hjorth, 2011
• Rapid dust formation possible when SFR > 103 solar masses per year
• Models require top heavy IMF
• Input from SNe not AGB stars
• Does not rule out quasar outflow model
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Growth by accretion (Shapiro ApJ 2005)
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Radiative efficiency
Comparison of quasar luminosity density with SMBH density at z<5 implies radiative efficiency εr > 0.1
(Soltan 1982; Aller & Richstone 2002; Elvis, Risaliti & Zamorani 2002; Yu & Tremaine 2002; Marconi 2004).
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Time to grow a black hole by accretion
Time available
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Effect of black hole spin: Amplification at z=6.43
Bla
ck h
ole
am
plifi
cati
on
Initial redshift
Amplification required from accretion alone100<M0<600
Amplification requiredassuming mergers account for growth ~104 in black hole mass
Black hole spin increases radiative efficiency up to 0.42
Efficiency
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Enhancement of accretion by jets/winds (Jolley & Kuncic 2008)
Gravitational power directed into wind or jet decreases the radiative luminosity
=> Accretion rate larger for given luminosity
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Modification of black hole growth
Effect of jet/wind is to reduce accretion time for a given luminosity
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Black hole mass at z=6
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Implications for AGN feedback
Kinetic luminosity of jet/wind
Powerful jets/winds such as this relevant for AGN feedback
In this case winds may be more likely since, even at high z, most quasars are radio quiet.
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So far .....
Straightforward black hole growth by accretion difficult
Driving black hole growth by Poynting-flux dominated jets/winds assists the formation of supermassive black holes by z~3, but still involves accretion at the Eddington limit
Winds have other benefits
• Feedback in early epochs
• Early creation of dust
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Next .......
Radio-Mode Feedback
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The violent universe
• “.... We see gas being churned by explosions and huge black holes in the center of the cluster. We see how it's cooling down and how the cooling is being balanced by tremendous outbursts of jets and bubbles of hot gas...”
– Martin Rees quoted in review by McNamara & Nulsen Heating hot atmospheres by active galactic nuclei
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Issues in Galaxy Formation (see Croton et al. ’06)
Hierarchical merging predicts more high mass galaxies than are observed (exponential cutoff in Schecter luminosity function)
Requires feedback in addition to that provided by supernovae => Regulation of star formation
Downsizing: Star formation and AGN activity takes place more vigorously and in higher mass objects at z ~ 1-2. Thereafter there is a downsizing in the amount of activity that takes place.
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Galaxy downsizing – semi-analytic models
Croton et al. 2006: Effect of “radio-mode” feedback on galaxy formation
Feedback produces an exponential cutoff in luminosity distribution at bright end
Feedback
No feedback
Accretion rate “orders of magnitude” below Eddington=> Low-powered radio galaxies providing the feedback
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SPH simulations – Booth & Schaye 2009
“Sub-grid” prescriptions for effect of black hole on surrounding ISM
See also Schaye et al. 2010
Resolution ~ 2 kpc
QuickTime™ and aVideo decompressor
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The secret life of an SPH particle
Accretion rate ~100 x Bondi rate
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Feedback in action: GPS and CSS sources
O’Dea et al. 1999
z=0.267
CSS Radio GalaxyEvidence for shocks and star formation
3C303.1
5 kpc
Text
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High redshift radio galaxies: MRC 0406-244
z=2.42 radio galaxy MRC0406-244
Nesvadba et al. 2009
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Simulations of jet-ISM interactions (Wagner & GB, ApJ Feb 2011)log(density)
Fractal, truncated, log-normal distribution of clouds
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“Standard” jet
QuickTime™ and aVideo decompressor
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Comparison with MRC 0406-244
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log[vw (km/s)]
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Criterion for inhibition of star formation
Mean radial velocity of clouds exceeds velocity dispersion
Parametrize jet in terms of Eddington luminosity:
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Effectiveness of jet feedback
Low filling factor
-1.0
-2.0
-3.0
-4.0
-5.0
0.0
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Eddington factor – velocity dispersion
Parametrize jet power in terms of Eddington luminosity
Eddington factor
M-σrelation
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Recent low filling factor simulation
D’’ continues this sequence to low filling factor
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QuickTime™ and aVideo decompressor
are needed to see this picture.
Lower filling factor
QuickTime™ and aVideo decompressor
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Revised speed – power diagram
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Jet-Disk interaction
QuickTime™ and aGraphics decompressor
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Density
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Radio and X-ray surface brightness
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Simulations and observations GPS/CSO 4C31.04
Image courtesy of NRAO/AUI and Gabriele Giovannini, et al.
10 mas = 11.4 pc
Reconciles differencebetween dynamic andspectral ages
Sutherland & GB 2007
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Supporting evidence for Jet-ISM interactions from observations of ellipticals
Kormendy et al., 2009, find that ellipticals with -21.54 < MV < -15.53 have “extra light” indicative of starbursts in“wet mergers”.
For MV < -21.66 no evidence of recent star formation
AGN more effective in providing feedback in bright ellipticals
Kormendy et al. interpreted in terms of high p/k of X-ray emitting ISM => more obstructive working surface for jet outflow
Jet – clumpy ISM interaction provides a more natural explanation
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Main points
Jets with Eddington factor > 10-3 – 10-2 may disperse gas in the core of an evolving galaxy but porosity increases the critical Eddington factor
Jets in a clumpy medium process all of the ISM
Jets of all powers in excess of 1043 ergs s-1 could play a role
Large fraction of the radio galaxy population involved
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Increasing influence of radio galaxies at high redshift in view of the evolving radio luminosity function (Sadler et al. 2007)
Important to consider the radio morphology of radio galaxies when assessing the role of AGN in influencing the evolution of the hosts