A Catalog of High-Velocity CIV Mini-BALs in the VLT-UVES and Keck-HIRES Archives
Chen Chen, Fred Hamann, Bo Ma, Michael Murphy

TL;DR
This paper catalogs high-velocity CIV mini-BALs in quasar spectra, revealing their properties, ionization states, and small-scale structures, and discusses implications for quasar outflow models.
Contribution
It provides the first extensive catalog of high-velocity CIV mini-BALs, analyzing their physical characteristics and suggesting a clumpy, inhomogeneous structure of quasar outflows.
Findings
105 mini-BALs identified in 44 quasars
Mini-BALs are highly ionized with small covering fractions
Evidence of inhomogeneous absorbers with small-scale structures
Abstract
We present a catalog of high-velocity CIV 1548,1551 mini-Broad Absorption Lines (mini-BALs) in the archives of the VLT-UVES and Keck-HIRES spectrographs. We identify high-velocity CIV mini-BALs based on smooth rounded BAL-like profiles with velocity blueshifts 4000 km/s and widths in the range 70 FWHM(1548) 2000 km/s (for 1548 alone). We find 105 mini-BALs in 44 quasars from a total sample of 638 quasars. The fraction of quasars with at least one mini-BAL meeting our criteria is roughly % after correcting for incomplete velocity coverage. However, the numbers of systems rise sharply at lower velocities and narrower FWHMs, suggesting that many outflow lines are missed by our study. All of the systems are highly ionized based on the strong presence of NV and OVI and/or the absence of SiII and CII when within the wavelength coverage.…
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