Origin of Metals around Galaxies I: Catalogs of Metal-line Absorption
  Doublets from High-Resolution Quasar Spectra
  We present the first paper of the series Origin of Metals around Galaxies
(OMG) aimed to study the origin of the metals observed in the circumgalactic
and intergalactic media. In this work we extract and build the catalogs of
metal absorbers that will be used in future analyses, and make our results
publicly available to the community. We design a fully automatic algorithm to
search for absorption metal-line doublets of the species CIV, NV, SiIV and MgII
in high-resolution ($R\gtrsim30\,000$) quasar spectra without human
intervention, and apply it to the high-resolution and signal-to-noise ratio
spectra of 690 quasars, observed with the UVES and HIRES instruments. We obtain
$5\,656$ CIV doublets, $7\,919$ doublets of MgII, $2\,258$ of SiIV, and 239 of
NV, constituting the largest high-resolution metal-doublet samples to date, and
estimate the dependence of their completeness and purity on various doublet
parameters such as equivalent width and redshift, using real and artificial
quasar spectra. The catalogs include doublets with rest-frame line equivalent
widths down to a few ${\rm m\AA}$, all detected at a significance above
3$\sigma$, and covering the redshifts between $1<z \lesssim 5$, properties that
make them useful for a wide range of chemical evolution studies.
