J/AJ/161/45 KODIAQ DR3: 727 quasars (0.1<zem<6.4) with ESI (O'Meara+, 2021)
The third Data Release of the KODIAQ survey.
O'Meara J.M., Lehner N., Howk J.C., Prochaska J.X.
<Astron. J., 161, 45 (2021)>
=2021AJ....161...45O 2021AJ....161...45O
ADC_Keywords: Surveys; QSOs; Intergalactic medium; Redshifts; Spectra, optical;
Spectra, infrared; Cross identifications
Keywords: Lyman limit systems ; Quasars ; Damped Lyman-alpha systems ;
Intergalactic medium ; Circumgalactic medium ; Double quasars
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<zem<6.4 observed with the Echellette Sepctrograph and
Imager at moderate resolution (4000≲R≲10000). DR3 contains 872
spectra available in flux calibrated form, representing a sum total
exposure time of ∼2.8 megaseconds. These coadded 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.
Description:
The Echellette Spectrograph Imager (ESI) data in DR3 were obtained by
individual PIs between 1999 December and 2015 January. ESI is an
echellette system, with 10 echelle orders spanning the range
3930<λ<10930Å. Cosmetic defects in the ESI CCD impact some
pixels in the wavelength regions 4460<λ<4565Å. Depending on
seeing conditions, slit width, and desired wavelength, ESI has a
resolution of 4000<R<10000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 104 873 *The KODIAQ DR3 sample
table2.dat 35 80 Overlap between DR2 (HIRES) and DR3 (ESI)
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Note on table1.dat: Object names and J2000 coordinates and quasar redshifts are
determined by passing the quasar coordinates from the raw data header
through SIMBAD or NED and choosing the appropriate match.
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See also:
J/ApJ/721/1 : Keck ESI observations of Lya systems (Penprase+, 2010)
J/ApJ/755/89 : Metallicities of damped Lyα systems (Rafelski+, 2012)
J/ApJ/788/119 : Properties of the highly ionized gas of quasars (Lehner+, 2014)
J/AJ/150/111 : KODIAQ DR1 (O'Meara+, 2015)
J/AJ/154/114 : KODIAQ DR2 (O'Meara+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Object identifier
16- 17 I2 h RAh [0/23] Hour of Right Ascension (J2000)
19- 20 I2 min RAm Minute of Right Ascension (J2000)
22- 28 F7.4 s RAs Second of Right Ascension (J2000)
30- 30 A1 --- DE- Sign of the Declination (J2000)
31- 32 I2 deg DEd Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 42 F6.3 arcsec DEs Arcsecond of Declination (J2000)
44- 49 F6.4 --- z [0.1/6.5] Quasar redshift (zem)
51- 53 A3 --- Obs.M Observation, Month
55- 58 I4 yr Obs.Y [1999/2015] Observation year
60- 69 A10 --- PI Principal investigator of observation
71- 75 A5 --- PID Keck Program identifier (1)
77- 80 F4.2 arcsec slit [0.5/6] Slit width, arcseconds
82- 88 F7.1 s Exptime [107/27000] Total exposure time
90- 95 F6.1 0.1nm wave-min [4000] Wavelength coverage, minimum
97-104 F8.2 0.1nm wave-max [8848/10987] Wavelength coverage, maximum
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Note (1): Keck Program ID information taken from the data header. Data without
a Program ID in the header are assigned the value XXX.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name ESI DR3 Name
16- 29 A14 --- KODIAQ Alternate HIRES DR2 Name
31- 35 F5.3 --- z [1.8/5.3] Quasar redshift (zem)
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History:
From electronic version of the journal
References:
O'Meara et al. DR1: 2015AJ....150..111O 2015AJ....150..111O cat. J/AJ/150/111
O'Meara et al. DR2: 2017AJ....154..114O 2017AJ....154..114O cat. J/AJ/154/114
(End) Prepared by [AAS], Coralie Fix [CDS], 08-Mar-2021