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Utilizing high-resolution cosmological hydrodynamic simulations weinvestigate various ultra-violet absorption lines in the circumgalactic mediumof star forming galaxies at low redshift, in hopes of checking and alleviatingthe claimed observational conundrum of the ratio of NV to OVI absorbers, amongothers. We find a satisfactory agreement between simulations and extantobservational data with respect to the ratios of the following four line pairsexamined, NV/OVI, SiIV/OVI, NIII/OVI and NII/OVI. For the pairs involvingnitrogen lines, we examine two cases of nitrogen abundance, one with constantN/O ratio and the other with varying N/O ratio, with the latter motivated bytheoretical considerations of two different synthetic sources of nitrogen thatis empirically verified independently. Along a separate vector, for all linepairs, we examine two cases of radiation field, one with the Haardt-Madaubackground radiation field and the other with an additional local radiationfield sourced by hot gas in the host galaxy. In all cases, two-sampleKolmogorov-Smirnov tests indicate excellent agreements. We find that theapparent agreements between simulations and observations will be stronglytested, if the bulk of current upper limits of various line ratios are turnedinto actual detections. We show that an increase in observational sensitivityby 0.2 dex will already start to significantly constrain the models.

UV Absorption Line Ratios in Circumgalactic Medium at Low Redshift in Realistic Cosmological Hydrodynamic Simulations