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)...
The black hole in this quasar accretes around one solar mass per day onto an existing mass of∼17 billion solar masses. In this process, the accretion disk alone releases a radiative energy of 2 × 1041 W. If the quasar is not strongly gravitationally lensed, then its broad-line...
Theoretical or Mathematical/ accretion disksastronomical spectrablack holesgalactic nucleimassquasarsSeyfert galaxiesspectral line breadth/ emission line profile responseionising flux variationstransverse velocity shiftsTHE emission lines in the optical spectra of several active galactic nuclei (AGNs) show a ...
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 a...
Stellar-mass black holes and neutron stars represent extremes in gravity, density, andmagnetic fields. They therefore serve as key objects in the study of multiple frontiers ofphysics. In addition, their origin (mainly in core-collapse supernovae) and evolution (via accretion or, for neutron sta...
Supermassive black holes (BHs) live at the heart of essentially all massive galaxies with bulges, power AGN, and are thought to be important agents in the evolution of their hosts. Observations of high-redshift quasars demonstrate that supermassive BHs must start out with masses considerably in...
Answer to: A star having the same mass of Earth's Sun is likely to become a ___. a. supergiant b. neutron star c. red giant d. black...
support the hypothesis that the lag in PG 1211+143 represents the signature of the same un- derlying mechanism, whose temporal characteristics scale with the mass of the central object. Key words: galaxies: active, galaxies: quasars: individual: PG 1211+143, X-rays: galaxies ...
theirlargedistance.ThemainmethodthathasprovedtobesuccessfulinAGN isreverberationmapping,whichisextremelytimeconsumingandgivesresults onM BH thatdependontheassumedgeometryoftheaccretiondisk.Therefore, onlyforafewwellstudiedquasarsandSeyfertgalaxiesM BH isknown(see ...