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 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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
qsos.dat 65 55 QSOs list
table1.dat 43 88 Fitted Lyα Forest regions
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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
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Bytes Format Units Label Explanations
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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
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Note (1): Q1244+3133 not identified
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Apr-2009