J/AJ/154/114 KODIAQ DR2 (O'Meara+, 2017)
The second data release of the KODIAQ survey.
O'Meara J.M., Lehner N., Howk J.C., Prochaska J.X., Fox A.J., Peeples M.S.,
Tumlinson J., O'Shea B.W.
<Astron. J., 154, 114-114 (2017)>
=2017AJ....154..114O 2017AJ....154..114O (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; QSOs ; Redshifts
Keywords: intergalactic medium - quasars: absorption lines - surveys
Abstract:
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<zem<5.29 observed with HIRES at high resolution
(36000≤R≤103000). DR2 contains 831 spectra available in
continuum normalized form, representing a sum total exposure time of
∼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).
Description:
The new data presented here in DR2 all stem from High-Resolution
Echelle Spectrograph (HIRES) observations by multiple PIs between 1995
and 2004. Table1 presents the HIRES deckers used across DR2 and their
corresponding spectral resolution. As with DR1, the majority of
observations were made with the C1 or C5 decker providing ∼6 and
∼8km/s FWHM resolution, respectively.
The Keck Observatory Database of Ionized Absorption toward Quasars
(KODIAQ) DR2 comprises HIRES observations of 300 quasar lines of sight
in total. Of these, 130 quasar sight lines are new since DR1 (O'Meara
et al. 2015, Cat. J/AJ/150/111), along with many new additional
observations of some of the DR1 quasars. Table2 presents the new data
since DR1.
Table3 presents the full DR2 sample of 300 quasars.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 15 7 High-Resolution Echelle Spectrograph (HIRES)
deckers used in the first Data Release
(DR1) of the Keck Observatory Database of
Ionized Absorption toward Quasars (KODIAQ)
table2.dat 85 348 Sample from the first Data Release (DR1) of the
Keck Observatory Database of Ionized
Absorption toward Quasars (KODIAQ)
table3.dat 47 300 Sample from the second Data Release (DR2) of
the Keck Observatory Database of Ionized
Absorption toward Quasars (KODIAQ)
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See also:
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/AJ/150/111 : KODIAQ DR1 (O'Meara+, 2015)
J/ApJS/221/2 : Keck+Magellan survey for LLSs. III. (Prochaska+, 2015)
J/ApJ/788/119 : Properties of the highly ionized gas of quasars (Lehner+, 2014)
J/ApJ/770/138 : Metallicities of Lyman limit systems and DLA (Lehner+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Decker Decker identifier
4- 8 F5.3 arcsec Width Width
10- 15 I6 --- R Spectra resolution (FWHM)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- KODIAQ Quasar designation (JHHMMSS+DDMMSS format) in
Keck Observatory Database of Ionized Absorption
toward Quasars (KODIAQ) (1)
16- 17 I2 h RAh Hour of Right Ascension (J2000) (2)
19- 20 I2 min RAm Minute of Right Ascension (J2000)
22- 26 F5.2 s RAs Second of Right Ascension (J2000)
28 A1 --- DE- Sign of the Declination (J2000) (2)
29- 30 I2 deg DEd Degree of Declination (J2000)
32- 33 I2 arcmin DEm Arcminute of Declination (J2000)
35- 39 F5.2 arcsec DEs Arcsecond of Declination (J2000)
41- 45 F5.3 --- zem [0/4.6] Emission line derived redshift (2)
47- 54 A8 --- Date Date of the observation
56- 66 A11 --- PI Principle Investigator name
68- 72 I5 s Exp [1000/47938] Total exposure time
74- 75 A2 --- Decker Decker identifier (B2, C1, C2, C5, or D1)
77- 80 I4 0.1nm lambda0 [3027/6522] Lower wavelength of spectrum;
in Å (3)
82- 85 I4 0.1nm lambda1 [4375/8934] Upper wavelength of spectrum;
in Å (3)
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Note (1): J120247+120630 is a misprint for J120147+120630; KODIAQ name,
coordinates and redshift updated at CDS.
Note (2): Determined by passing the quasar coordinates from the raw data header
through SIMBAD or SDSS and choosing the appropriate match.
Note (3): Wavelength coverage of the spectra after trimming poorly extracted
orders when necessary (see above). We note that these exposure times are
only a crude measure of data quality, as they do not include the observing
conditions.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- KODIAQ Quasar designation (JHHMMSS+DDMMSS format) in
Keck Observatory Database of Ionized
Absorption toward Quasars (KODIAQ)
16- 20 F5.3 --- zem [0/5.3] Emission line derived redshift
22- 27 I6 s Exp [600/114000] Total exposure time
29- 32 I4 0.1nm Olam0 [2995/6215] Lower observed wavelength of
coverage; in Å
34- 37 I4 0.1nm Olam1 [4602/9725] Upper observed wavelength of
coverage; in Å
39- 42 I4 0.1nm Rlam0 [743/6031] Lower rest wavelength; in Å (1)
44- 47 I4 0.1nm Rlam1 [1195/8388] Upper rest wavelength; in Å (1)
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Note (1): Rest wavelength calculated at the Quasar redshift.
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Acknowledgement:
John O'Meara [W. M. Keck Observatory]
History:
From electronic version of the journal
16-May-2018: Insert into VizieR
29-Jul-2020: J120247+120630 misprint corrected in Table 2.
Coordinates added in Table 3 from Table 2 and KODIAQ DR1
(O'Meara+, 2015, J/AJ/150/111).
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 08-Feb-2018