TY - JOUR
T1 - Accretion onto black holes
AU - Park, Myeong Gu
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).
PY - 2017
Y1 - 2017
N2 - Most energetic events or objects in the universe are explained by accretion onto black holes. However, the accretion flow onto black holes can assume diverse forms. It can be spherical or disk-like, hot or cold, optically thick or thin, highly luminous or under-luminous, efficient or inefficient in terms of energy production, even for the same physical conditions of gas from which black holes accrete. I will review each form of accretion flow with its physical characteristics. I will especially discuss the mass accretion rate and its dependence on the density, temperature, and the angular momentum of gas being accreted. The mass accretion rate is the most important factor to affect the radiation efficiency and the luminosity, and thereby, the growth history of the black holes and their coevolution with host galaxies. The ubiquity of outflow from hot accretion flow and its implications are also discussed.
AB - Most energetic events or objects in the universe are explained by accretion onto black holes. However, the accretion flow onto black holes can assume diverse forms. It can be spherical or disk-like, hot or cold, optically thick or thin, highly luminous or under-luminous, efficient or inefficient in terms of energy production, even for the same physical conditions of gas from which black holes accrete. I will review each form of accretion flow with its physical characteristics. I will especially discuss the mass accretion rate and its dependence on the density, temperature, and the angular momentum of gas being accreted. The mass accretion rate is the most important factor to affect the radiation efficiency and the luminosity, and thereby, the growth history of the black holes and their coevolution with host galaxies. The ubiquity of outflow from hot accretion flow and its implications are also discussed.
UR - http://www.scopus.com/inward/record.url?scp=85046059591&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:85046059591
SN - 1824-8039
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 35th International Cosmic Ray Conference, ICRC 2017
Y2 - 10 July 2017 through 20 July 2017
ER -