accretion, accretion disksdark mattergravitational lensing: microgravitational lensing: strongquasars: generalWe use the microlensing variability observed for nine gravitationally lensed quasars to show that the accretion disk size at 2500 Angstroms is related to the black hole mass by log(R_2500/cm)...
作者: S Dib 摘要: We show how the mass function of dense cores (CMF) which results from the gravoturbulent fragmentation of a molecular cloud evolves in time under the effect of gas accretion. Accretion onto the cores leads to the formation of larger numbers of massive cores and to a ...
We use the radiatively inefficient "slim disk" solution—advective, optically thick flows that generalize the standard geometrically thin disk model—to show how mildly super-Eddington intermittent accretion may significantly ease the problem of assembling the first massive black holes when the universe ...
Finally, EVOLUTIONARY SEQUENCE OF BLAZARS is discussed. 展开 关键词: Accretion: accretion disk Galaxies: jets Galaxies: evolution Quasars: general DOI: 10.1007/s10509-015-2309-4 被引量: 1 年份: 2015 收藏 引用 批量引用 报错 分享 全部来源 免费下载 求助全文 全文购买 Springer 国家科技图书文献...
However, this procedure has uncertainties associated with the unknown distribution of the gas clouds. Here, we show that the black hole masses derived from the properties of the accretion disk and virial mass estimates differ by a factor that is inversely proportional to the width of the broad ...
The emission has smoothly decayed over time since 2010, possibly indicating a long-lived tidal disruption event5. The X-ray spectrum is ultra-soft and can be described by accretion disk emission with luminosity proportional to the fourth power of the disk temperature during long-term evolution. ...
While we cannot see the peak of the radiation from the accretion disk, we recognize the following signatures of an accreting black hole listed below (see schematic in top right panel). First, we see X-ray emission at the galaxy nucleus. High-energy interactions between photons and electrons ...
Richstone5 Observational work conducted over the past few decades indicates that all massive galaxies have supermassive black holes at their centres. Although the luminosities and brightness fluctuations of quasars in the early Universe suggest that some were powered by black holes with masses greater ...
Remaining material from the cloud will accrete onto both the disk and onto the star itself. The disk also accretes onto the star and, as it does so, astronomers can track the accretion rate from the radiation produced at the innermost margin of the disk. In general terms, the accretion ...
But black hole growth cannot be arbitrarily fast. Matter falling onto a black hole forms a swirling, hot, bright “accretion disk.” When this happens around a supermassive black hole, the result is an active galactic nucleus. The brightest such objects, known as quasars, are amo...