4U 1543–624 is a relatively bright persistent low-mass X-ray binary. Analysis of archival data from ASCA, SAX and RXTE is presented. The X-ray continuum be can modeled with the standard low-mass X-ray binary spectrum, an isothermal blackbody and a Comptonized component. Variations in the luminosity and flux ratio of the continuum components are seen. An increase in luminosity is accompanied by ...

We compile a blue AGN sample from SDSS and investigate the ratio of hard Xray to bolometric luminosity in dependence on Eddington ratio and black hole mass. Our sample comprises 240 radio-quiet Seyfert 1 galaxies and QSOs. We find that the fraction of hard X-ray luminosity (log(L2−10kev/Lbol)) decreases with the increase of Eddington ratio. We also find that the fraction of hard X-ray luminosit...

Since molecular gas is distributed in the inner disk of galaxies while HI in the outer disk, CO emission can trace the inner rotation curves more accurately than HI. We have derived most-completely sampled rotation curves by combining HI and CO position-velocity diagrams. We show that inner rotation curves have a steep increase within the central few hundred-pc region. The inner behavior of rot...

We derive the kinetic luminosity function for flat-spectrum radio jets, using the empirical and theoretical scaling relation between jet power and radio core luminosity. The normalization for this relation is derived from a sample of flat-spectrum cores in galaxy clusters with jet-driven X-ray cavities. The total integrated jet power at z p 0 is . By integrating over redshift, we determine the ...

Aims. We investigate the dependence of the luminosity-diameter relation of galaxies on the environment. Methods. This study is based on a comparison between the 80 galaxies in the Shapley-Ames Catalog that are located within a distance of 10 Mpc, and the luminosity-diameter relation for galaxies in great clusters such as Virgo and Coma. Results. A relatively tight linear correlation is observed...

The central black-hole masses of a sample of 30 luminous quasars are estimated using Hβ fwhm measurements from a combination of new and previously-published nuclear spectra. The quasar black-hole mass estimates are combined with reverberationmapping measurements for a sample of Seyfert galaxies (Wandel, Peterson & Malkan 1999) in order to study AGN black-hole masses over a wide range in nuclear...

We present a Bayesian inference analysis of the Markevitch (1998) and Allen & Fabian (1998) cooling flow corrected X-ray cluster temperature catalogs that constrains the slope and the evolution of the empirical X-ray cluster luminosity-temperature (L-T ) relation. We find that for the luminosity range 1044.5 erg s−1 ∼< Lbol ∼< 10 46.5 erg s−1 and the redshift range z ∼< 0.5, Lbol ∝ T 2.80 −0.15...

The masses of the central black holes of Active Galactic Nuclei estimated by the reverberation virial technique seem to be significantly smaller than predicted from the black hole mass-bulge luminosity relation for massive black holes detected by kinematic methods in less active and normal galaxies. We reexamine the relation for updated data and suggest a few reasons that may cause this discrep...

We present the first measurement of the black hole (BH) mass function for broad-line active galaxies in the local Universe. Using the ∼ 9000 broad-line active galaxies from the Fourth Data Release of the Sloan Digital Sky Survey, we construct a broad-line luminosity function that agrees very well with the local soft X-ray luminosity function. Using standard virial relations, we then convert obs...