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Published October 2015 | Published
Journal Article Open

The First Data Release of the KODIAQ Survey


We present and make publicly available the first data release (DR1) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. The KODIAQ survey is aimed at studying galactic and circumgalactic gas in absorption at high redshift, with a focus on highly ionized gas traced by O vi, using the HIRES spectrograph on the Keck I telescope. KODIAQ DR1 consists of a fully reduced sample of 170 quasars at $0.29\lt {z}_{\mathrm{em}}\lt 5.29$ observed with HIRES at high resolution (36,000 ≤ R ≤ 103,000) between 2004 and 2012. DR1 contains 247 spectra available in continuum normalized form, representing a sum total exposure time of ~1.6 megaseconds. These coadded spectra arise from a total of 567 individual exposures of quasars taken from the Keck Observatory Archive (KOA) in raw form and uniformly processed using a publicly available HIRES data reduction package. DR1 is publicly available to the community, housed as a higher level science product at the KOA. We will provide future data releases that make available additional quasars, including those with pre-2004 observations taken with the previous-generation HIRES detectors.

Additional Information

© 2015. The American Astronomical Society. Received 2015 May 13. Accepted 2015 August 6. Published 2015 September 14. Support for this research was made by NASA through the Astrophysics Data Analysis Program (ADAP) grant NNX10AE84G. This research has made use of the KOA, which is operated by the W.M. Keck Observatory and the NASA Exoplanet Science Institute (NExScI), under contract with the National Aeronautics and Space Administration. The data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. We thank the anonymous referee for their suggestions which improved this work. Finally, the authors recognize the major contributions by the late astronomers Wallace L. W. Sargent and Arthur M. Wolfe to this data set, and indeed to the entire discipline of quasar absorption line studies. We dedicate this work to the memory of these great scientists.

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August 20, 2023
August 20, 2023