J/AJ/150/111 KODIAQ DR1 (O'Meara+, 2015)
The first data release of the KODIAQ survey.
O'Meara J.M., Lehner N., Howk J.C., Prochaska J.X., Fox A.J., Swain M.A.,
Gelino C.R., Berriman G.B., Tran H.
<Astron. J., 150, 111 (2015)>
=2015AJ....150..111O 2015AJ....150..111O (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Redshifts
Keywords: catalogs - intergalactic medium - quasars: absorption lines -
quasars: general - surveys
Abstract:
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
KeckI telescope. KODIAQ DR1 consists of a fully reduced sample of 170
quasars at 0.29<zem<5.29 observed with HIRES at high resolution
(36000≤R≤103000) 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.
Description:
As part of the Keck Observatory Database of Ionized Absorption toward
Quasars (KODIAQ) survey, we have uniformly processed the HIRES spectra
of hundreds of quasars. The HIRES spectrograph is located on the KeckI
telescope. In this work, we present the first Data Release (DR1) from
the survey.
Data taken over the last two decades from the HIRES spectrograph fall
into three general categories. The first is the earliest data from
1995 to 1997. The second category spans the years 1997-2004. Finally,
the third category covers data from 2004 to the present. The data in
DR1 are all drawn from this last category.
The KODIAQ DR1 comprises 170 quasars observed in the mosaic
configuration of HIRES between 2004 and 2012. Note that one quasar is
a lensed system, so the number of individual sightlines is 171. The
DR1 sample is summarized in Table2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 88 234 Sample from the first Data Release (DR1) of the
Keck Observatory Database of Ionized Absorption
toward Quasars (KODIAQ)
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See also:
J/MNRAS/345/609 : Variability of the fine-structure constant (Murphy+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Quasar designation (JHHMMSS+DDMMSSA format)
17- 18 I2 h RAh Hour of Right Ascension (J2000) (1)
20- 21 I2 min RAm Minute of Right Ascension (J2000) (1)
23- 27 F5.2 s RAs Second of Right Ascension (J2000) (1)
29 A1 --- DE- Sign of the Declination (J2000) (1)
30- 31 I2 deg DEd Degree of the Declination (J2000) (1)
33- 34 I2 arcmin DEm Arcminute of Declination (J2000) (1)
36- 40 F5.2 arcsec DEs Arcsecond of Declination (J2000) (1)
42- 47 F6.4 --- zem [0.297/5.292] Emission redshift (1)
49- 57 A9 --- Date Observation date
59- 69 A11 --- PI Principal Investigator
71- 75 I5 s Exp [600/25200] Total exposure time
77- 78 A2 --- Decker HIRES decker (B2, B5, C1, C5, or E3) (2)
80- 83 I4 0.1nm lambda0 [2995/5733] Lower value of wavelength coverage
(in Å)
84 A1 --- --- [-]
85- 88 I4 0.1nm lambda1 [5535/9725] Upper value of wavelength coverage
(in Å)
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Note (1): J2000 coordinates and quasar redshifts are determined by passing the
quasar coordinates from the raw data header through SIMBAD or SDSS and
choosing the appropriate match.
Note (2): HIRES has a number of user-selectable instrument element settings.
These include detector binning, entrance slit width and length (set
simultaneously by choosing a decker), and echelle and cross-disperser
angle. The vast majority of HIRES data in DR1 were obtained with the C1 or
C5 decker that provide FWHM R=48000 and R=36000, corresponding to velocity
resolutions of 6.2 and 8.3km/s (FWHM), respectively.
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 05-Apr-2016