DARK MATTER PROBES OF SUPERMASSIVE BLACK HOLE S HotSci 23 July 2014 Joe Silk (IAP, JHU)
-
Upload
benedict-black -
Category
Documents
-
view
212 -
download
0
Transcript of DARK MATTER PROBES OF SUPERMASSIVE BLACK HOLE S HotSci 23 July 2014 Joe Silk (IAP, JHU)
DARK MATTER PROBES OF SUPERMASSIVE BLACK HOLES
HotSci 23 July 2014
Joe Silk (IAP, JHU)
SMBH binaries in quasars may be commonat parsec scales,from Balmer line offsets
Liu e al 2013
Stuck at the final parsec…Benson 2014
Mpc
IMBH EXPEL BARYONSTwo baryon problems:Too big to fail dwarfs & low baryon fraction in massive galaxies
Intermediate mass BH 103-106 Msun
Inoue + 2013
supernovae
IMBH
Baryon fraction fraction
Peirani + 2012Boylan-Kirchin et al. 2011
predicted hosts,not observed
Duc + 2013
Dubois+ 2013
Gondolo + JS 1999, Gnedin & Primack 2004, Sadeghian, Ferrer + Will 2013
<v>
mxPlateau: nx(r)<sv> tBH ~ 1Density profile
Vasiliev & Zelnikov 2008
tr (GC,M31)~3Gyr
but SMBH at GC grows over 1 Gyr& tr (M87 SMBH)~105Gyr!
~tr
~3tr
Does cusp survive? MAYBE!
NEAR BINARY BLACK HOLES
Kozai mechanism drives resonant infall of DM in eccentric orbits………operates for binary black hole
Naoz and Silk 2014
Naoz and Silk 2014 Dark matter torus forms
supermassive black hole at Galactic Center HESS J1745-290 prediction for CTA: superexponential signature of TeV DM annihilations
Belikov & JS 2013
Vaiana + 2014
30-300 GeV
the near future
NEARBY AGN
M87 is an attractive target
Distance 2000 x GC but MBH 1000 x SagA*
Flux ~ nx2<sv> (2rp)3 ~ MBH
3/<sv> for low <sv> nx(rp)<sv> tBH ~ 1
Dynamical heating of spike ~ 1014 yr vs 109 yr (GC)
Gorchtein et al 2010
Gomez et al 2013
M87
CenA
relativistic jets emanate from ergosphere, so high energy e,p collide with DM spike particles!
EXTRAGALACTIC GAMMA RAY BACKGROUND
There is room for an exotic component from dark matter
EXTRACALACTIC DIFFUSE g RAY BACKGROUND
10 TeV
1 TeV
0.1 TeV
NFW
Belikov & Silk 2013
Annihilations In dark matter spikes around supermassive black holes
THE ULTIMATE PARTICLE ACCELERATOR: dark matter cusp around black hole
particle horizon
Schwarzschild
BLACK HOLES
maximum 4.5 m
NEAR KERRBLACK HOLES
ergosphere Penrose process
particle horizonrS=2GM/c2
Banados, West, JS 2009
Highly controversial…but the dust hasn’t settled yet!
Kerr black hole
near event-horizon particle collisionsof KK particles: excitations
Arina, Bringmann, Vollmann, JS 2014
Rotating black hole can feed Penrose effect via DM particle collisions
no maximumfor extremal Kerr!
Black hole shadow
Event Horizon Telescope
Simulated image at 1mmof M87 or SagA* black hole
Resolve horizon scale GM/c2 at ~5 m arcsec
Huang + 2007
M87 distance 2000 x GC but MBH 1000 x SagA*