The Third Data Release of the KODIAQ Survey

TL;DR

The third data release of the KODIAQ survey provides a large, uniformly processed set of quasar spectra from Keck Observatory, enabling extensive studies of ionized absorption in the universe.

Contribution

It offers a comprehensive, publicly accessible dataset of 872 spectra from 727 quasars, processed with a standardized pipeline for community use.

Findings

Provides high-quality, flux-calibrated spectra for 727 quasars.

Includes a total of 872 spectra with 2.8 million seconds of exposure time.

Facilitates research on ionized absorption and quasar properties.

Abstract

We present and make publicly available the third data release (DR3) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. KODIAQ DR3 consists of a fully-reduced sample of 727 quasars at 0.1 < z < 6.4 observed with ESI at moderate resolution (4000 < R < 10000). DR3 contains 872 spectra available in flux calibrated form, representing a sum total exposure time of approximately 2.8 megaseconds. These co-added spectra arise from a total of 2753 individual exposures of quasars taken from the Keck Observatory Archive (KOA) in raw form and uniformly processed using a data reduction package made available through the XIDL distribution. DR3 is publicly available to the community, housed as a higher level science product at the KOA and in the igmspec database.