Early Black Hole formation by accretion of gas and dark matter

Recent discovery of luminous quasars at z > 6 has posed a severe challenge to the theory of structure formation of the universe. These quasars are thought to be powered by supermassive black holes (SMBHs). However no consensus is yet to be reached as to the origin and early formation mechanism of massive SMBHs. We propose a model in which intermediate-mass black holes (IMBHs) with mass of ∼ 10 4 M ⊙ are formed in early dark matter halos. We carry out detailed stellar evolution calculations for the first generation stars including annihilation energy of dark matter (DM) particles. We show that very massive stars, as massive as 10 4 M ⊙ , can be formed in an early DM halo. Such stars are extremely bright with Log L / L ⊙ ≳ 8.2. They will gravitationally collapse to form IMBHs. These black holes could have seeded the formation of early SMBHs.