The study of the broad-line region (BLR) using reverberation mapping has allowed us to establish an empirical relation between size this line-emitting and continuum luminosity that drives line emission (i.e., R H β − L 5100 relation). To realize its full potential, intrinsic scatter in needs be understood better. mass accretion rate (or equivalently Eddington ratio) plays a key role addressing ...

Abstract Cool ( T ∼ 10 4 K) gas is commonly observed around z > 2 quasars as traced by extended Ly α emission. These large-scale nebulae are usually studied using circularly averaged surface-brightness profiles, which suppress information on morphological differences. Here, we revisit the 78 2–3 to obtain a novel estimate of their area and asymmetry common redshift-corrected threshold. We fi...

We analyzed the luminosity-temperature (L-T) relation for 2 samples of galaxy clusters which have all been observed by the ASCA satellite. We used 32 high redshift clusters (0.3<z<0.6), 53 low redshift clusters (z<0.3), and also the combination of the low and high redshift datasets. This is one of two surveys to use only ASCA data, and has the largest number of high redshift clusters. We assume...