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Double quasars: probes of black hole scaling relationships and merger scenarios
Gary Foreman, Marta Volonteri, Massimo Dotti
We analyze the available sample of double quasars, and investigate their physical properties. Our sample comprises 85 pairs, selected from the Sloan Digital Sky Survey (SDSS). We d…
Implications of primordial black holes on the first stars and the origin of the super--massive black holes
Cosimo Bambi, Douglas Spolyar, Alexander D. Dolgov +2
If the cosmological dark matter has a component made of small primordial black holes, they may have a significant impact on the physics of the first stars and on the subsequent for…
LISA detection of massive black hole binaries: imprint of seed populations and of exterme recoils
A. Sesana, M. Volonteri, F. Haardt
All the physical processes involved in the formation, merging, and accretion history of massive black holes along the hierarchical build--up of cosmic structures are likely to leav…
Formation of the first nuclear clusters and massive black holes at high redshift
Bernadetta Devecchi, Marta Volonteri
We present a model for the formation of massive black holes ($\sim 1000 \msun$) due to stellar-dynamical processes in the first stellar clusters formed at early cosmic times ($z\si…
The Chandra Deep Protocluster Survey: Evidence for an Enhancement in the AGN Activity in the SSA22 Protocluster at z = 3.09
B. D. Lehmer, D. M. Alexander, J. E. Geach +8
We present results from a new ultra-deep 400 ks Chandra observation of the SSA22 protocluster at z = 3.09. We have studied the X-ray properties of 234 z ~ 3 Lyman break galaxies (L…
Off-nuclear AGN as a signature of recoiling massive black holes
M. Volonteri, P. Madau
During the final phases of inspiral, a massive black hole (MBH) binary experiences a recoil due to the asymmetric emission of gravitational waves. We use recent results from numeri…