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J/ApJ/662/72        Lyman alpha forest of 55 QSOs            (Becker+, 2007)

The evolution of optical depth in the Lyα forest: evidence against reionization at z∼6. Becker G.D., Rauch M., Sargent W.L.W. <Astrophys. J., 662, 72-93 (2007)> =2007ApJ...662...72B (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Redshifts ; Spectroscopy Keywords: cosmology: observations - early universe - intergalactic medium - quasars: absorption lines Abstract: We examine the evolution of the IGM Lyα optical depth distribution using the transmitted flux probability distribution function (PDF) in a high-resolution sample of 55 QSOs spanning absorption redshifts 1.7<z<5.8. The data are compared to two theoretical τ distributions: a model distribution based on the density distribution of Miralda-Escude et al. (2000ApJ...530....1M; MHR00) and a lognormal distribution. Description: Observations were made using the HIRES spectrograph on Keck I between 1993 and 2006. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file qsos.dat 65 55 QSOs list table1.dat 43 88 Fitted Lyα Forest regions
See also: J/A+A/373/757 : Lyman-Alpha Forest of 3 QSOs (Kim+, 2001) J/MNRAS/335/555 : Lyman-alpha forest of 5 QSOs (Kim+, 2002) J/A+A/458/427 : Lyman alpha absorbers in 0.5<z<1.9 QSOs (Janknecht+, 2006) Byte-by-byte Description of file: qsos.dat
Bytes Format Units Label Explanations
1- 15 A15 --- QSO QSO designation (1) 18- 19 I2 h RAh ? Simbad Hour of Right Ascension (J2000.0) 21- 22 I2 min RAm ? Simbad Minute of Right Ascension (J2000.0) 24- 27 F4.1 s RAs ? Simbad Second of Right Ascension (J2000.0) 29 A1 --- DE- ? Simbad Sign of the Declination (J2000.0) 30- 31 I2 deg DEd ? Simbad Degree of Declination (J2000.0) 33- 34 I2 arcmin DEm ? Simbad Arcminute of Declination (J2000.0) 36- 37 I2 arcsec DEs ? Simbad Arcsecond of Declination (J2000.0) 41- 65 A25 --- SName Simbad name
Note (1): Q1244+3133 not identified
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 A15 --- QSO QSO designation 17- 20 F4.2 --- z QSO redshift 22- 26 F5.3 --- zabs Mean absorption redshift 28- 32 F5.3 --- zabsm Mimimun absorption redshift value 34- 38 F5.3 --- zabsM Maximum absorption redshift value 40- 43 F4.2 --- EFlux Median error flux
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Apr-2009
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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