Journal
ASTRONOMICAL JOURNAL
Volume 154, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/aa82b8
Keywords
intergalactic medium; quasars: absorption lines; surveys
Categories
Funding
- NASA through the Astrophysics Data Analysis Program (ADAP) [NNX10AE84G, NNX16AF52G]
- NSF [1516777]
- National Aeronautics and Space Administration
- W. M. Keck Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1516777, 1517353] Funding Source: National Science Foundation
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We present and make publicly available the second data release (DR2) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. KODIAQ DR2 consists of a fully reduced sample of 300 quasars at 0.07 < z(em) < 5.29 observed with HIRES at high resolution (36,000 <= R <= 103,000). DR2 contains 831 spectra available in continuum normalized form, representing a sum total exposure time of similar to 4.9 megaseconds on source. These co-added spectra arise from a total of 1577 individual exposures of quasars taken from the Keck Observatory Archive (KOA) in raw form and uniformly processed. DR2 extends DR1 by adding 130 new quasars to the sample, including additional observations of QSOs in DR1. All new data in DR2 were obtained with the single-chip Tektronix TK2048 CCD configuration of HIRES in operation between 1995 and 2004. DR2 is publicly available to the community, housed as a higher level science product at the KOA and in the igmspec database (v03).
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