We show that the mass of ionized gas in the broad-line regions (BLRs) of luminous quasars is at least several hundred M , and probably of the order of 10 3–104 M . BLR mass estimates in several existing textbooks suggest lower values but pertain to much less luminous Seyfert galaxies or include only a small fraction of the ionized/emitting volume of the BLR. The previous estimates also fail to ...

The inhomogeneous cooling flow scenario predicts the existence of large quantities of gas in massive elliptical galaxies, groups, and clusters that have cooled and dropped out of the flow. Using spatially resolved, deprojected X-ray spectra from the ROSAT PSPC, we have detected strong absorption over energies approximately 0.4-0.8 keV intrinsic to the central approximately 1&arcmin; of the gala...

Using the observations of the star formation rate and H I densities to z ∼ 4, with measurements of the Molecular Gas Depletion Rate (MGDR) and local density of H 2 at z = 0, we derive the history of the gas consumption by star formation to z ∼ 4. We find that closed-box models in which H 2 is not replenished by H I require improbably large increases in ρ(H 2) and a decrease in the MGDR with loo...

BACKGROUND Heparin binds positively charged electrolytes. In blood gas syringes, electrolyte-balanced heparin is used to prevent a negative bias in electrolyte concentrations. The potential pre-analytical errors introduced by blood gas syringes are largely unknown. Here, we evaluate electrolyte concentrations in non-anticoagulated blood compared with concentrations measured in electrolyte-balan...

Aims. We present FUSE spectra of the giant H  region NGC604 in the spiral galaxy M33. Chemical abundances are tentatively derived from far-UV absorption lines and compared to those derived from optical emission lines. Methods. Absorption lines from neutral hydrogen and heavy elements were observed against the continuum provided by the young massive stars embedded in the H  region. the line ...