J/A+A/473/791 CIV absorption in DLAs and sub-DLAs systems (Fox+, 2007)
C IV absorption in damped and sub-damped Lyman-alpha systems.
Correlations with metallicity and implications for galactic winds at z≃2-3.
Fox A.J., Ledoux C., Petitjean P., Srianand R.
<Astron. Astrophys. 473, 791 (2007)>
=2007A&A...473..791F 2007A&A...473..791F
ADC_Keywords: QSOs ; Spectroscopy ; Redshifts
Keywords: galaxies: quasars: absorption lines - galaxies: high-redshift -
galaxies: halos - galaxies: ISM - galaxies: kinematics and dynamics
Abstract:
We present a study of CIV absorption in a sample of 63 damped
Lyman-α (DLA) systems and 11 sub-DLAs in the redshift range
1.75<zabs<3.61, using a dataset of high-resolution (6.6km/s FWHM),
high signal-to-noise VLT/UVES spectra. The complex absorption line
profiles show both narrow and broad CIV components, indicating the
presence of both warm, photoionized and hot, collisionally ionized
gas. We report new correlations between the metallicity (measured in
the neutral-phase) and each of the CIV column density, the CIV total
line width, and the maximum CIV velocity.
Description:
Measurements of C IV 1548, 1550 absorption in DLAs and sub-DLAs using
data taken with the UVES spectrograph on the VLT.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
position.dat 58 60 QSO positions, from Simbad
table1.dat 86 74 Comparison of C IV and Neutral Gas DLA Measurements
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See also:
J/other/PASA/19.455 : Damped Lyman alpha absorption of QSOs (Curran+, 2002)
J/MNRAS/354/L31 : SDSS DR2 QSO and DLA properties (Murphy+, 2004)
Byte-by-byte Description of file: position.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name QSO name
11- 12 I2 h RAh Simbad right ascension (J2000)
14- 15 I2 min RAm Simbad right ascension (J2000)
17- 21 F5.2 s RAs Simbad right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 33 F4.1 arcsec DEs Declination (J2000)
36- 58 A23 --- SName Simbad name
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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- 9 A9 --- Name QSO name
11- 14 F4.2 --- zQSO QSO redshift
16- 22 F7.5 --- zabs Absorber redshift
24- 28 F5.2 [cm-2] logN(HI) log of HI column density
30- 33 F4.2 [cm-2] e_logN(HI) Error on log of HI column density
35 A1 --- l_[Z/H] Limit flag on [Z/H]
36- 40 F5.2 [Sun] [Z/H] Metallicity on log scale relative to solar
42- 45 F4.2 [Sun] e_[Z/H] ? Error on metallicity
47- 48 A2 --- n_[Z/H] Element used to measure [Z/H] (Zn, Si or S)
50- 52 I3 km/s dV(0) Velocity width of neutral lines (1)
54- 57 I4 0.1nm CIVline Line used to measure CIV absorption properties
59 A1 --- l_logN(CIV) Limit flag on logN(CIV)
60- 64 F5.2 [cm-2] logN(CIV) log of CIV column density
66- 69 F4.2 [cm-2] e_logN(CIV) ? Error on log of CIV column density
71 A1 --- l_dv(CIV) Limit flag on dv(CIV)
72- 75 I4 km/s dv(CIV) Velocity width of CIV lines
77- 78 I2 km/s e_dv(CIV) ? Error on velocity width of CIV lines
80- 83 I4 km/s v0(CIV) CIV velocity offset from neutral lines
85- 86 I2 km/s e_v0(CIV) Error on CIV velocity offset
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Note (1): Neutral line velocity width containing the central 90% of the
apparent optical depth, made of optically thin lines. Typical
error is about 3km/s.
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Acknowledgements:
Andrew J. Fox, fox(at)iap.fr
(End) Andrew J. Fox [IAP], Patricia Vannier [CDS] 04-Sep-2007