Recent X–ray observations of intense high–speed outflows in quasars suggest that supercritical accretion on to the central black hole may have an important effect on a host galaxy. I revisit some ideas of Silk and Rees, and assume such flows occur in the final stages of building up the black hole mass. It is now possible to model explicitly the interaction between the outflow and the host galax...

Recent X–ray observations of intense high–speed outflows in quasars suggest that supercritical accretion on to the central black hole may have an important effect on a host galaxy. I revisit some ideas of Silk and Rees, and assume such flows occur in the final stages of building up the black hole mass. It is now possible to model explicitly the interaction between the outflow and the host galax...

Besides the most common form of aromaticity involving a π-ring, hexaiodobenzene and hexakis(phenylselenyl)benzene dications also present σ-aromaticity in outer ring formed by main group substituents. These two compounds are considered σ- π-double aromatic, their characterization is special interest to fields organic structural chemistry. In this work, we decided explore double substituted tropy...

An improved transformation of the full width at half maxima (FWHM) of the [O III] λ5007 line in AGNs to the stellar velocity dispersion, σ∗, of the host galaxy is given. This significantly reduces the systematic errors in using FWHM([O III]) as a proxy for σ∗. AGN black hole masses, M•, estimated using the Dibai single epoch spectrum method, are combined with the new estimates of σ∗ to give a r...

The recent discovery of a correlation between nuclear black hole mass, M•, and the stellar velocity dispersion, σ∗(Gebhardt et al. 2000a; Ferrarase & Merritt 2000), in elliptical galaxies and spiral bulges, has raised the question whether such a relationship exists for AGN. Estimates of M• for many AGN, made using reverberation mapping techniques, allow exploration of the relationship between b...

Recent observations of young galaxies at redshifts z ∼ 3 have revealed simultaneous AGN and starburst activity, as well as galaxy–wide superwinds. I show that there is probably a close connection between these phenomena by extending an earlier treatment of the MBH−σ relation (King, 2003). As the black hole grows, an outflow drives a shell into the surrounding gas. This stalls after a dynamical ...

By using the brick wall method we calculate the thermodynamic potential of the complex scalar field in a charged Kerr black hole. Using it we show that in the Hartle-Hawking state the leading term of the entropy is proportional to AH ǫ , which becomes divergent as the system approaches the black hole horizon. The origin of the divergence is that the density of states diverges at the horizon. PA...

We calculate the effect of noncommutative spacetime on the greybody factor on the supergravity side. For this purpose we introduce a system of D3-branes with a constant NS B-field along their world volume directions (x 2 , x 3). In the B → ∞ limit, one has the D=7 black hole solution including the noncommutative effect. Considering the propagation of minimally coupled scalar in this background,...