GNIRS-DQS II: CIV and MgII sp. measurements

Unfortunately, this line is redshifted out of the optical band at z~1, leaving MBH estimates to rely on proxy rest-frame ultraviolet (UV) emission lines, such as CIV{lambda}1549 or MgII{lambda}2800, which contain intrinsic challenges when measuring, resulting in uncertain MBH estimates.

In this work, we aim at correcting MBH estimates derived from the CIV and MgII emission lines based on estimates derived from the H{beta} emission line. We find that employing the equivalent width of CIV in deriving MBH estimates based on MgII and CIV provides values that are closest to those obtained from H{beta}. We also provide prescriptions to estimate MBH values when only CIV, only MgII, and both CIV and MgII are measurable.