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J/ApJ/596/768       Optical depths in 19 QSOs                (Schaye+, 2003)

Metallicity of the intergalactic medium using pixel statistics. II. The distribution of metals as traced by C IV. Schaye J., Aguirre A., Kim T.-S., Theuns T., Rauch M., Sargent W.L.W. <Astrophys. J., 596, 768-796 (2003)> =2003ApJ...596..768S
ADC_Keywords: QSOs ; Redshifts ; Spectra, ultraviolet Keywords: cosmology: miscellaneous - galaxies: formation - intergalactic medium - quasars: absorption lines Abstract: We measure the distribution of carbon in the intergalactic medium as a function of redshift z and overdensity δ. Using a hydrodynamical simulation to link the H I absorption to the density and temperature of the absorbing gas, and a model for the UV background radiation, we convert ratios of C IV to H I pixel optical depths into carbon abundances. For the median metallicity this technique was described and tested in Paper I (Aguirre et al., 2002ApJ...576....1A) of this series. Here we generalize it to reconstruct the full probability distribution of the carbon abundance and apply it to 19 high-quality quasar absorption spectra. Description: We analyzed spectra of the 19 quasars listed in the first column of Table 1. Fourteen spectra were taken with the UV-Visual Echelle Spectrograph on the VLT, and five were taken with the High Resolution Echelle Spectrograph on the Keck telescope. The UVES spectra were taken from the ESO archive. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 54 19 Observed quasars table4.dat 117 456 Recovered CIV optical depths table5.dat 73 42 Observed effective optical depth
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name QSO name 14- 18 F5.3 --- zem Emission redshift 20- 24 F5.3 --- zmin Minimum absorption redshift 26- 30 F5.3 --- zmed Median absorption redshift 32- 36 F5.3 --- zmax Maximum absorption redshift 38- 44 F7.2 0.1nm Lambdamin Minimum wavelength 46- 50 A5 --- Inst Instrument (UVER or HIRES) 52- 54 A3 --- Ref References (1)
Note (1): References are numbered as follows: 1 = Kim et al., 2002MNRAS.335..555K 2 = Kim et al., 2003, MNRAS, submitted (astro-ph/0308103) 3 = Kim et al., 2001, Cat. J/A+A/373/757 4 = Rauch et al., 1997ApJ...481..601R, 1997ApJ...489....7R 5 = Boksenberg et al., 2003, submitted (astro-ph/0307557)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name QSO name 14- 19 F6.3 [---] logtauHI Recovered HI (1216) optical depth (1) 21- 26 F6.3 [---] logtauCIV-0.5 ? 30.85th percentile of the recovered CIV (1548) optical depth 28 A1 --- n_logtauCIV-0.5 [-] Note (2) 29- 33 F5.3 [---] e_logtauCIV-0.5 ? 1σ error in logtauCIV,-0.5 35- 40 F6.3 [---] logtauCIV ? 50th percentile of the recovered CIV (1548) optical depth 42 A1 --- n_logtauCIV [-] Note (2) 43- 47 F5.3 [---] e_logtauCIV ? 1σ error in logtauCIV 49- 54 F6.3 [---] logtauCIV+0.5 ? 69.15th percentile of the recovered CIV (1548) optical depth 56 A1 --- n_logtauCIV+0.5 [-] Note (2) 57- 61 F5.3 [---] e_logtauCIV+0.5 ? 1σ error in logtauCIV,+0.5 63- 68 F6.3 [---] logtauCIV+1.0 ? 84.13th percentile of the recovered CIV (1548) optical depth 70 A1 --- n_logtauCIV+1.0 [-] Note (2) 71- 75 F5.3 [---] e_logtauCIV+1.0 ? 1σ error in logtauCIV,+1.0 77- 82 F6.3 [---] logtauCIV+1.5 ? 93.32th percentile of the recovered CIV (1548) optical depth 84 A1 --- n_logtauCIV+1.5 [-] Note (2) 85- 89 F5.3 [---] e_logtauCIV+1.5 ? 1σ error in logtauCIV,+1.5 91- 96 F6.3 [---] logtauCIV+2.0 ? 97.73th percentile of the recovered CIV (1548) optical depth 98 A1 --- n_logtauCIV+2.0 [-] Note (2) 99-103 F5.3 [---] e_logtauCIV+2.0 ? 1σ error in logtauCIV,+2.0
Note (1): -9 = indicates that the corresponding tauCIV are the taumin values (see section 5.1 for the definition of taumin). Note (2): A '-' indicates that tauHI<tauc (see section 5.1 for the definition of tauc).
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name QSO name 15- 19 F5.3 --- zmedA Median absorption redshift, all pixels 21- 25 F5.3 --- zminA Minimum absorption redshift value, all pixels 27- 31 F5.3 --- zmaxA Maximum absorption redshift value, all pixels 33- 37 F5.3 --- taueffA Effective optical depth, all pixels (1) 39- 43 F5.3 --- e_taueffA rms uncertainty on taueffA 45- 49 F5.3 --- zmed Median absorption redshift, after removal of contamination 51- 55 F5.3 --- zmin Minimum absorption redshift value, after removal of contamination 57- 61 F5.3 --- zmax Maximum absorption redshift value, after removal of contamination 63- 67 F5.3 --- taueff Effective optical depth, after removal of contamination (1) 69- 73 F5.3 --- e_taueff rms uncertainty on taueff
Note (1): taueff=←lnF>, where F is the normalized flux in the Lyα forest
History: From electronic version of the journal References: Aguirre et al., Paper I 2002ApJ...576....1A
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 19-Dec-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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