J/ApJS/171/29 UCSD/Keck Damped Lyα Abundance Database (Prochaska+, 2007)
The UCSD/Keck damped Lyα abundance database: a decade of high-resolution
spectroscopy.
Prochaska J.X., Wolfe A.M., Howk J.C., Gawiser E., Burles S.M., Cooke J.
<Astrophys. J. Suppl. Ser., 171, 29-60 (2007)>
=2007ApJS..171...29P 2007ApJS..171...29P
ADC_Keywords: H I data ; QSOs ; Spectroscopy ; Abundances
Keywords: quasars: absorption lines
Abstract:
We publish the Keck/HIRES and Keck/ESI spectra that we have obtained
during the first 10 years of Keck observatory operations. Our full
sample includes 42 HIRES spectra and 39 ESI spectra along 65 unique
sight lines providing abundance measurements on about 85 DLA systems.
The normalized data can be downloaded from the journal or from our
supporting Web site. The database includes all of the sight lines
that have been included in our papers on the chemical abundances,
kinematics, and metallicities of the damped Lyα systems. This
data has also been used to argue for variations in the fine-structure
constant. We present new chemical abundance measurements for 10 damped
Lyα systems and a summary table of high-resolution metallicity
measurements (including values from the literature) for 153 damped
Lyα systems at z>1.6. We caution, however, that this metallicity
sample (and all previous ones) is biased to higher NHI values than a
random sample.
Description:
For nearly all observations, the HIRES spectra were acquired using
either a 0.8" or 1.1" wide decker (FWHM about 6 and 8km/s,
respectively) and the ESI observations were carried out with the 0.5"
or 0.75" slit (FWHM about 33 and 44km/s, respectively). All of the
HIRES spectra were acquired with the original Tektronix 2048*2048CCD.
In general we strove to achieve a final signal-to-noise ratio (S/N)
of >15pixel-1 (2km/s/pix for HIRES, 11km/s/pix for ESI). ESI has a
fixed format that covers the spectral region λ=4000 to 10000Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table13.dat 117 153 Damped Lyα (DLA) Metal Summary
refs.dat 52 31 References
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See also:
III/211 : Keck/HIRES Sky Line Atlas (Osterbrock+ 1997)
J/ApJ/472/509 : Lyman-alpha Forest in Q0000-26 (Lu+ 1996)
Byte-by-byte Description of file: table13.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Quasar Name (1)
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 26 F6.3 s RAs Second of Right Ascension (J2000)
28 A1 --- DE- Sign of the Declination (J2000)
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)
40 A1 --- n_pos [*] Position missing in original table, added
by CDS (from Simbad)
41- 45 F5.3 --- zem Emission redshift
47- 52 F6.4 --- zabs Absorption redshift
54- 58 F5.2 [cm-2] logNHI Ionic column density
60- 63 F4.2 [cm-2] e_logNHI rms uncertainty on logNHI
65- 66 I2 --- n_[alpha/H] [0/13] contents of α measurement (2)
68- 72 F5.2 --- [alpha/H] ?=- [alpha/H] metallicity
74- 77 F4.2 --- e_[alpha/H] ?=- rms uncertainty on [alpha/H]
79 I1 --- l_[Zn/H] [0/3] limit flag on Zn measurements (3)
81- 85 F5.2 --- [Zn/H] ?=- [Zn/H] metallicity
87- 90 F4.2 --- e_[Zn/H] ?=- rms uncertainty on [Zn/H]
92- 93 I2 --- n_[Fe/H] [0/25] flag on Fe measurements (4)
95- 99 F5.2 --- [Fe/H] ?=- [Fe/H] metallicity
101-104 F4.2 --- e_[Fe/H] ?=- rms uncertainty on [Fe/H]
106-117 A12 --- Ref References in refs.dat file
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Note (1): Object called SDSS1737+5828 is SDSS J171227.75+575506.9
(in accord with the position given in the table)
Note (2): Note as follows:
0 = No measurement
1 = Si measurement
2 = Si lower limit
3 = Si upper limit
4 = [S/H]
5 = [O/H]
13 = S+Si limits
Note (3): Note as follows:
0 = No measurement
1 = Zn measurement
2 = Zn lower limit
3 = Zn upper limit
Note (4): Note as follows:
0 = No measurement
1 = Fe measurement
2 = Fe lower limit
3 = Fe upper limit
4 = [Ni/H]-0.1dex
5 = [Cr/H]-0.2dex
6 = [Al/H]
11 = Fe, Ni, Cr, Al limits
13 = Fe, Ni, Cr, Al limits
25 = Mean of Fe limits
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Number of reference as used in table 13
4- 22 A19 --- Bibcode Bibcode
24- 52 A29 --- Aut First author
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 15-Apr-2009