J/A+A/556/A141    ESO-UVES Advanced Data Products (EUADP) sample  (Zafar+, 2013)

The ESO UVES advanced data products quasar sample. II. Cosmological evolution of the neutral gas mass density. Zafar T., Peroux C., Popping A., Milliard B., Deharveng J.-M., Frank S. <Astron. Astrophys., 556, A141 (2013)> =2013A&A...556A.141Z 2013A&A...556A.141Z
ADC_Keywords: QSOs ; Redshifts Keywords: galaxies: abundances - galaxies: evolution - galaxies: high-redshift - quasars: absorption lines - quasars: general Abstract: We present here a dataset of quasars observed with the Ultraviolet Visual Echelle Spectrograph (UVES) on the Very Large Telescope and available in the European Southern Observatory UVES Advanced Data Products (EUADP) archive. The sample is made up of a total of 250 high resolution quasar spectra with emission redshifts ranging from 0.191≤zem≤6.311. The total UVES exposure time of this dataset is 1560 h. Thanks to the high resolution of UVES spectra, it is possible to unambiguously measure the column density of absorbers with damping wings, down to NHI≳1019cm-2, which constitutes the sub-damped Lyα absorber (sub-DLA) threshold. Within the wavelength coverage of our UVES data, we find 150 damped Lyα systems (DLAs)/sub-DLAs in the range 1.5<zabs<4.7. Damped absorbers, seen in the spectra of background quasars, are unique probes to select HI-rich galaxies. These galaxies allow one to estimate the neutral gas mass over cosmological scales. The neutral gas mass is a possible indicator of gas consumption as star formation proceeds. The damped Lyα absorbers (DLAs; NHI≥2x1020cm-2) and sub-DLAs (1019≤NHI≤2x1020cm-2) are believed to contain a large fraction of neutral gas mass in the Universe. In aper I of the series, we presented the results of a search for DLAs and sub-DLAs in the European Southern Observatory (ESO) Ultraviolet Visual Echelle Spectrograph (UVES) advanced data products dataset of 250 quasars. Here we use an unbiased subsample of sub-DLAs from this dataset to derive their statistical properties. We built a subset of 122 quasars ranging from 1.5<zem<5.0, suitable for statistical analysis. The statistical sample was analyzed in conjunction with other sub-DLA samples from the literature. This resulted in a combined sample of 89 sub-DLAs over a redshift path of Δz=193. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file sample.dat 171 250 Properties of the EUADP quasar sample (table1 of paper I, Zafar et al., 2013A&A...556A.140Z 2013A&A...556A.140Z) param.dat 67 373 Complete log of 250 EUADP quasars of which 122 contribute to the statistical EUADP sample (table1 of paper II) refs.dat 77 38 References -------------------------------------------------------------------------------- Byte-by-byte Description of file: sample.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 17 A17 --- QSO Quasar name 19- 20 I2 h RAh Right ascension (J2000) 22- 23 I2 min RAm Right ascension (J2000) 25- 29 F5.2 s RAs Right ascension (J2000) 31 A1 --- DE- Declination sign (J2000) 32- 33 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 38- 42 F5.2 arcsec DEs Declination (J2000) 44- 48 F5.2 mag mag ?=- Simbad V, B or J magnitude 49 A1 --- n_mag [VBJ] Band for magnitude 51- 55 F5.3 --- zem Emission redshift of the quasar 57-106 A50 --- Cov Wavelength coverage(s) of the spectra 108-161 A54 --- Prog ESO program ID(s) 163-164 I2 --- Ns Number of spectra used for co-adding, where spectra from BLUE, RED upper and lower arms are counted separately 166-171 I6 s Texp Total exposure time of each quasar -------------------------------------------------------------------------------- Byte-by-byte Description of file: param.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 17 A17 --- QSO Quasar name 19- 23 F5.3 --- zem Emission redshift 25- 29 F5.3 --- zmin ?=- Minimum redshift (1) 30 A1 --- --- [-] 31- 35 F5.3 --- zmax ? Maximun redshift (1) 36 A1 --- n_zmax [s] s for EUADP Sample (2) 37 A1 --- f_zmax [,] , indicates other redshift interval for the quasar 40- 44 F5.3 --- zLLS ?=- redshift of Lyα-Limit System (LLS) 46- 50 F5.3 --- zabs ?=- DLA/sub-DLA redshift 51 A1 --- n_zabs [s] s for Sample (2) 52- 53 A2 --- l_logNHI [~< ] Limit flag on logLHI 54- 58 F5.2 [cm-2] logNHI ?=- HI column density of DLAs/sub-DLAs 60- 63 F4.2 [cm-2] e_logNHI ? rms uncertainty on logNHI 64 A1 --- f_logNHI [s] s for Sample (2) 66- 67 I2 --- Ref ? Reference for absorber, in refs.dat file -------------------------------------------------------------------------------- Note (1): Redshift interval to obtain the redshift path over which the presence of damped Lyα absorbers (DLA) can be determined. * The lowest redshift (zmin) is either the lowest redshift at which the signal-to-noise (S/N) ratio ensures the detection of absorption features at the sub-DLA threshold of EWrest=2.5Å, or where an intervening Lyman-Limit System (LLS) is present and thus prohibits the detection of any absorption feature at wavelengths shorter than the restframe Lyman break (912Å). * The higher redshift (zmax) is adopted as 3000km/s blueward of the quasar emission redshift. Note (2): 's' indicates that redshift path, zabs and NHI of the absorbers are included in our statistical sample (boldfaced values in the printed table). -------------------------------------------------------------------------------- Byte-by-byte Description of file: refs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 48 A25 --- Aut Author's name 50- 77 A28 --- Com Comments -------------------------------------------------------------------------------- History: From electronic version of the journal References: Zafar et al., Paper I 2013A&A...556A.140Z 2013A&A...556A.140Z
(End) Patricia Vannier [CDS] 27-Nov-2013
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