Also, the origin of the frequently observed X-ray flares in the source still remains a mystery. In this paper, we will make an attempt to address these issues in light of our recent work on black hole spin and its observational consequences.Wei Cui...
We present spectra of the black hole binary $A0620-00$ taken at ${m H}\alpha$ and ${m H}\beta$ to study the distribution of emission-line flux from its accretion disc. Using the spectra of ${m H}\alpha$, we have measured the K-type companion star's radial velocity semi-amplitud...
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...
Let's use the equation, Where Y is the amount of times more massive the black hole is than the sun.Since Y=80 , we know that this black hole is 80 times more massive than the sun. But it needs to be 100 (or ) or more times more massive than our sun to be considered an in...
We also resolve the rotational broadening of the secondary star which yields the lowest mass ratio ever measured (q=Mc/Mx=0.050). The mass of the black hole is now restricted to the range 7–29 M⊙.关键词: Black holes High resolution spectroscopy Mass measurement Rotation measurement ...
Onken C A,Peterson B A.The Mass of the Central Black Hole in the Seyfert galaxy NGC 3783.The Astro.Physical.Journal. 2002Metzroth K.G., Onken C.A. and Peterson B.M. (2006). "The Mass of the Central Black Hole in the Seyfert Galaxy NGC 4151". ApJ, 647:901-909. URL http://...
On the Mass of the Black Hole in GS 2000+25 We present J- and K'-band (1.95--2.35 mu m) photometry of the quiescent X-ray nova GS 2000+25, obtained in an attempt to constrain the mass of the compact ... PJ Callanan,MR Garcia,AV Filippenko,... - 《Astrophysical Journal》 被...
We report upper limits on the masses of black holes that can be present in the centers of 16 nearby galaxy bulges. These limits Mfor our statistically complete sample were derived from the modeling of the central emission-line widths ([N II] or [S II]), observed over a 0.25"×0.2" ...
Currently, astronomers believe that supermassive black holes sit at the center of every galaxy as massive as or larger than the Milky Way. But they're also curious about black holes in smaller galaxies such as NGC 4395. Knowing the mass of the black hole at the center of NGC 4395 and bei...
We present spectra of the black hole binary $A0620-00$ taken at ${\rm H}\alpha$ and ${\rm H}\beta$ to study the distribution of emission-line flux from its accretion disc. Using the spectra of ${\rm H}\alpha$, we have measured the K-type companion star's radial velocity semi...