J/A+A/508/133 Damped Lymanα absorbers in z>4 QSOs (Guimaraes+, 2009)
Damped and sub-damped Lyman-α absorbers in z > 4 QSOs.
Guimaraes R., Petitjean P., De Carvalho R.R., Djorgovski S.G.,
Noterdaeme P., Castro S., Poppe P.C.R., Aghaee A.
<Astron. Astrophys., 508, 133-140 (2009)>
=2009A&A...508..133G 2009A&A...508..133G
ADC_Keywords: QSOs ; Redshifts ; Spectroscopy
Keywords: Galaxy: evolution - Galaxy: formation - quasars: absorption lines -
intergalactic medium - cosmology: observations
Abstract:
We present the results of a survey of damped (DLA, logN(HI)>20.3) and
sub-damped Lyman-α systems (19.5<logN(HI)<20.3) at z>2.55 along
the lines-of-sight to 77 quasars with emission redshifts in the range
4<zem<6.3. Intermediate resolution (R∼4300) spectra were obtained
with the Echellette Spectrograph and Imager (ESI) mounted on the Keck
telescope. A total of 100 systems with logN(HI)>19.5 were detected of
which 40 systems are damped Lyman-α systems for an absorption
length of ΔX= 378. About half of the lines of sight of this
homogeneous survey have never been investigated for DLAs.
Description:
Medium resolution (R∼4300) spectra of all z>3 quasars discovered in
the course of the DPOSS survey (Digital Palomar Observatory Sky
Survey; see, e.g., Kennefick et al. 1995AJ....110.2553K 1995AJ....110.2553K; Djorgovski et
al. 1999, ASP Conf. Ser., 191, 179 , and the complete listing of QSOs
available at http://www.astro.caltech.edu/ george/z4.qsos) were
obtained with the Echellette Spectrograph and Imager (ESI) mounted on
the KECK II 10m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 92 99 Summary of observations
table2.dat 96 100 List of DLA-subDLAs
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See also:
J/MNRAS/346/1103 : Redshifts of damped Lymanα absorbers (Peroux+, 2003)
J/ApJ/635/123 : The SDSS-DR3 damped Lyα survey (Prochaska+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- QSO QSO name
16- 20 F5.3 --- zem Emission redshift
22- 26 F5.2 mag Rmag R magnitude
28- 29 I2 h RAh Right ascension (J2000)
31- 32 I2 min RAm Right ascension (J2000)
34- 37 F4.1 s RAs Right ascension (J2000)
39 A1 --- DE- Declination sign (J2000)
40- 41 I2 deg DEd Declination (J2000)
43- 44 I2 arcmin DEm Declination (J2000)
46- 49 F4.1 arcsec DEs Declination (J2000)
51- 60 A10 "YYYY/MM/DD" Obs.Date Observation date
61 A1 --- --- [,]
62- 63 I2 d DD2 ? Second day of observation for Obs.Date
64 A1 --- --- [,]
65- 66 I2 d DD3 ? Third day of observation for Obs.Date
68- 77 A10 "YYYY/MM/DD" Obs.Date2 Second Observation date
78 A1 --- --- [,]
79- 80 I2 d DD4 ? Second day of observation for Obs.Date2
82- 84 I3 min t.exp Exposure time
86- 92 A7 -- Note Previous usage (G1)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- QSO QSO name
15- 19 F5.3 --- zem Emission redshift
21- 25 F5.3 --- zemmin Minimium value of emission redshift
27- 31 F5.3 --- zemmax Maximum value of emission redshift
33- 37 F5.3 --- zabs DLA-subDLA absorption redshift
39- 43 F5.2 [cm-2] logN(HI) HI column density
45- 48 F4.2 [cm-2] e_logN(HI) rms uncertainty on logN(HI)
50- 85 A36 --- Lines Metal Lines
86- 88 A3 --- r_Lines detection of the metal lines (1)
90- 96 A7 --- Note Previous usage (G1)
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Note (1): Notes on metal lines as follows:
a = Metals were detected by Peroux et al. (2005MNRAS.363..479P 2005MNRAS.363..479P)
b = Metals were detected by Prochaska & Wolfe (2009ApJ...696.1543P 2009ApJ...696.1543P)
c = We do not cover the red part of the spectrum λ≥6400Å
d = Metals were detected by Peroux et al. (2001AJ....121.1799P 2001AJ....121.1799P)
e = Metals were detected by Dessauges-Zavadsky et al.
(2003MNRAS.345..447D 2003MNRAS.345..447D)
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Global notes:
Note (G1): Quasars from this survey were previously used for
ΩDLA, HI estimations as follows:
1 = Peroux et al. (2001AJ....121.1799P 2001AJ....121.1799P)
2 = Peroux et al. (2003, Cat. J/MNRAS/346/1103)
3 = Peroux et al. (2005MNRAS.363..479P 2005MNRAS.363..479P)
4 = Prochaska et al. (2005, Cat. J/ApJ/635/123)
5 = Prochaska & Wolfe (2009ApJ...696.1543P 2009ApJ...696.1543P)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Jan-2011