Unveiling a Supermassive Black Hole at the Center of Our Galaxy
THE ROLE OF BLACK HOLES IN GALAXY FORMATION · THE BLACK HOLE – GALAXY CONNECTION Stellar...
Transcript of THE ROLE OF BLACK HOLES IN GALAXY FORMATION · THE BLACK HOLE – GALAXY CONNECTION Stellar...
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THE ROLE OF BLACK HOLESIN GALAXY FORMATION
Tiziana Di MatteoCarnegie Mellon University
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OUTLINE:
•The black hole – galaxy connection : what have we learnt from recent observations?
•Supermassive black holes and galaxies in computer simulations Collaborators: Volker Springel (MPA), Lars Hernquist (Harvard)
•A ‘rough’ black hole timeline
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“The unreasonable effectivenessof mathematics in the physical
sciences” Eugene Wigner
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Karl Schwarzschild (1916)
BLACK HOLES: EXACT SOLUTION TO EINSTEIN FIELD EQUATIONS
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SUPERMASSIVE BLACK HOLES: THE DISCOVERY OF QUASARS (Quasi-Stellar Objects) IN GALAXIES
Maarten Schmidt (1960) et al.
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BLACK HOLE “ANATOMY”
matter around theBH forms anaccretion disk.Gas particlesinteract as theymove around.They heat up, loseenergy and ang. mom.emit radiation.
As matter comeswithin a certainradius from a blackhole it is trapped:gravity is so strongnot even light canescape
†
RS =2GMBH
c2
Highly relativistic jets stream out Perpendicular to the disk: charged particlesAccelerated along strong B fields
~ 3 M/Msun [km]
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Matter falls onto black holes
†
L = h M•
c 2mass supply rate
BH luminosity= energy released by matter falling onto BH
Efficiency(accretiondisk physics)
Rdisk ~
10^(3-4
) Rschw
Note:For Mbh ~ 10^6 M/Msun (like in our MW)Rdisk = 3*10^9 km ~ Solar system
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The black hole in the MILKY Way center
†
M BH = 2.6 ¥106 MSun
VLT, Genzel et al. (MPE)
m2.36.1:IR m-
Keck, Ghez
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Black holes in the center of galaxies: M87
•¥= M103M 9
BH
HST, Ford et al., Harms et al. 1995
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THE BLACK HOLE – GALAXY CONNECTION
Magorrian et al. 1998; Kormendy & Richstone 1995
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THE BLACK HOLE – GALAXY CONNECTION
Stellar Velocity Dispersion
Blac
k ho
le m
ass
(in u
nits
of
Sola
r M
asse
s)
The M - relation for supermassive black holess
fundamental link betweenassembly of black holesand galaxy formation
Gravitational potential of spheroid
Black hole mass related to large scale propertiesof galaxies
†
MBH =108 M s200 km/s
Ê
Ë Á
ˆ
¯ ˜
4
Ferrarese & Merritt 2000, Gebhardt et al. 2000,Tremaine et al. 2002
ù
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THE BLACK HOLE – GALAXY CONNECTION
60 arcsec
SDSS 1030+0524Z=6.28
Hu et al. (2002;Keck & Subaru):galaxy @ z=6.56
Fan et al. (2001;SDSS):QSO @ z=6.28
Galaxies & Quasars already show up during first 109 years
Chandra (Brandt et al2002)
MBH=4x109 M
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SUPERMASSIVE BH FORMATION
Stellar mass black holes end product of massive star evolutionform from collapse of star M > 3 Mù
ORIGIN UNCERTAIN !!!
SMBH PROBABLY GROW FROM SEED POPULATION:
MASSIVE BLACK HOLES
INEVITABLE END PRODUCT OF FIRST EPISODE of galactic star formation
FIRST proto-galaxies form inrare density peaks ofprimordial density fluctuationsat z > 20.Here the first generationof star that forms
direct BHformation
Pair instab.
Direct BHformation
40 Mù
150 Mù
250 Mù
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S.Komossa et al. 03 (MPE)
BH GROWTH and Fuelling of AGN :NGC 6240: FINAL STAGES GALAXY MERGER: contains 2 AGN
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Smooth Particle Hydrodymicsimulations of galaxy formation
• Radiative cooling of gas within halos (dissipation)• Star formation and feedback processes
SUB-RESOLUTION multiphase MODEL
for the ISM
DARK MATTER
STARS
N-body METHOD: mass discretised in particlesmodeled as collisionless fluid governedby Boltzmann Eq. - grav potential solved with Poisson Eq.
GAS
SPH Method: fluid represented by particlessmoothed by local kernel averagingHydro eqns solved in its Galilean-invariant Lagrangian Formulation.
Code: GADGET2 (Springel ‘05)
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BHs in Numerical Simulations of Galaxy formation
• ACCRETION: BH swallows the gas from the surrounding galaxy and grows
•FEEDBACK: energy extracted from the black hole injected in the surrounding gas
•BH: “sink” particle in galaxies of small mass
†
˙ E = 0.1 f ˙ M c 2 f ª 0.5%†
˙ M B = a 4p(GMBH )2
(cs2 + Vrel
2 )3 / 2 r
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We construct compound disk galaxies that are in dynamicalequilibriumSTRUCTURAL PROPERTIES OF MODEL GALAXIES
Dark halo (Hernquist profile matched to NFW halo)Stellar disk (expontial)Stellar bulgeGaseous disk (expontial)Central supermassive black hole (small seed mass)
Components:_We compute the exact gravitationalpotential for the axisymmetric massdistribution and solve the Jeansequations_Gas pressure effects are included_The gaseous scale-height is allowed tovary with radius
With Bulge Without Bulge
Springel, Di Matteo & Hernquist, ‘05
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89.0% turned into stars
0.05% expelled from halo
1.2% cold, star forming gas
9.8% diffuse gas in halo
51.9% turned into stars
35.3% expelled from halo
0% cold, star forming gas
11.1% diffuse gas in halo
1.6% swallowed by BH(s)
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NO BH
no BH with BH
Star formation rate
BH supply rate
BH Mass
Quasar phase
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BLACK HOLE MASS AND GALAXY PROPERTIES:
RESULTS FROM SIMULATIONS
Blac
k ho
le m
ass
~ Galaxy Mass
EXPERIMENTALMEASUREMENTS
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BLACKBLACK HOLES GROWTH ALONG HOLES GROWTH ALONG THE HISTORY OF THE UNIVERSETHE HISTORY OF THE UNIVERSE
COSMOLOGICAL SIMULATIONS WITH BLACK HOLES
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What does it take to put the Universe in a box?•Recipe
•Physics•A BIG computer!
GravityDark matter collisionless dynamicsGas DynamicsStar Formation Galaxy FormationBlack holes
mathematical models that best describethe behavior and interactionsof the major physical componentsinvolved at different times andscales of cosmic evolution
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COEVOLUTION OF BLACK HOLES AND GALAXIES•Self-Consistent treatment of BLACK HOLES IN NUMERICAL SIMULATIONS OF GALAXY FORMATION