An Atlas of Computed Equivalent Widths of Quasar Broad Emission Lines

We present graphically the results of several thousand photoionizationcalculations of broad emission line clouds in quasars, spanning seven orders ofmagnitude in hydrogen ionizing flux and particle density. The equivalent widthsof 42 quasar emission lines are presented as contours in the particle density -ionizing flux plane for a typical incident continuum shape, solar chemicalabundances, and cloud column density of $N(H) = 10^{23} cm^{-2}$. Results aresimilarly given for a small subset of emission lines for two other columndensities ($10^{22} cm^{-2}$ and $10^{24} cm^{-2}$), five other incidentcontinuum shapes, and a gas metallicity of 5 \Zsun. These graphs should proveuseful in the analysis of quasar emission line data and in the detailedmodeling of quasar broad emission line regions. The digital results of theseemission line grids and many more are available over the Internet.