J/A+A/530/A33 Evolutionary tracks to estimate DLA depletions (Vladilo+, 2011)
Silicon depletion in DLA systems: The S/Zn method.
Vladilo G., Abate C., Yin J., Cescutti G., Matteucci F.
<Astron. Astrophys. 530, A33 (2011)>
=2011A&A...530A..33V 2011A&A...530A..33V
ADC_Keywords: Models, evolutionary ; Abundances
Keywords: ISM: abundances - dust, extinction - galaxies: high-redshift -
quasars: absorption lines - methods: miscellaneous -
instrumentation: spectrographs
Abstract:
Silicates are an important component of interstellar dust that has
been poorly investigated in high redshift galaxies. As a preliminary
step to studying silicates at high redshift, we survey silicon
depletions in damped Lyα (DLA) systems. Silicon depletion is
mild in the Galactic interstellar medium (ISM) and is expected to be
weaker in most DLA systems, so we introduce a method for improving the
accuracy of DLA depletion measurements.
Description:
Evolutionary tracks of the reference model of galactic chemical
evolution used to estimate DLA depletions. This model is that of a
dwarf galaxy with parameters Minfall=1x109M☉,
epsilon=0.4Gyr-1, and normal wind with λw=3.5Gyr-1.
More details on the model can be found in Section 4 of the paper.
The criteria followed to select this particular model are explained in
Section 5.1.3. Abundance ratios are by number and are expressed in a
logarithmic scale with log(H)=12.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 71 378 Evolutionary tracks of the reference model of
galactic chemical evolution described in
Section 5 of the paper
table4.dat 81 35 The Zn+S sample of DLA systems selected as
explained in Sect. 3.
table5.dat 81 47 The Z sample: DLA systems with measurements of
ZnII, but not SII, column densities
table6.dat 81 29 The S sample: DLA systems with measurements of
SII, but not ZnII, column densities
refs.dat 103 56 References (table7 of the paper)
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See also:
J/A+A/341/709 : Chemical spiral galaxies models (Lindner+ 1999)
J/A+A/478/701 : Color excess of SDSS quasars with DLA systems (Vladilo+, 2008)
J/ApJ/683/321 : Metallicities of GRB, DLA, and Lyα galaxies (Fynbo+ 2008)
Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 11 E11.5 Gyr t Time after the start of star formation
13- 23 E11.5 --- eps(Mg) Absolute abundance of magnesium [12+log(Mg/H)]
25- 35 E11.5 --- eps(Si) Absolute abundance of silicon [12+log(Si/H)]
37- 47 E11.5 --- eps(S) Absolute abundance of sulfur [12+log(S/H)]
49- 59 E11.5 --- eps(Fe) Absolute abundance of iron [12+log(Fe/H)]
61- 71 E11.5 --- eps(Zn) Absolute abundance of zinc [12+log(Zn/H)]
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Byte-by-byte Description of file: table[456].dat
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Bytes Format Units Label Explanations
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1 A1 --- Sample [SMD] QSO sample (1)
3- 12 A10 --- QSO QSO name
14- 19 F6.4 --- z QSO redshift
20 A1 --- n_z [c] emission redshift from Ellison et al.
(2010MNRAS.406.1435E 2010MNRAS.406.1435E)
22- 27 F6.4 --- zabs Absorption redshift
29- 33 F5.2 [cm-2] logN HI column density
35- 38 F4.2 [cm-2] e_logN rms uncertainty on logN(HI)
40- 44 F5.2 [cm-2] logN(Zn) ? ZnII column density
46- 49 F4.2 [cm-2] e_logN(Zn) ? rms uncertainty on logN(ZnII)
51- 55 F5.2 [cm-2] logN(S) ? SII column density
57- 60 F4.2 [cm-2] e_logN(S) ? rms uncertainty on logN(SII)
62- 64 A3 --- r(Zn) Reference code for logN(ZnII) (see "refs.dat")
66- 68 A3 --- r(S) Reference code for logN(SII) (see "refs.dat")
69 A1 --- n_r(S) [b] logN(S) corrected for unseen components
71- 73 A3 --- r(Mg) Reference code for logN(MgII) (see "refs.dat")
75- 77 A3 --- r(Si) Reference code for logN(SiII) (see "refs.dat")
79- 81 A3 --- r(Fe) Reference code for logN(FeII) (see "refs.dat")
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Note (1): Samples as follows:
S = Systems used to constrain the models of galactic chemical evolution
M = Molecular DLA systems with f(H2)>10-4.5; values f(H2) from:
* Zn+S sample (table4): Noterdaeme et al. (2008A&A...481..327N 2008A&A...481..327N),
Srianand et al. (2008A&A...482L..39S 2008A&A...482L..39S), and
Fynbo et al. (2011, MNRAS, in press.)
* Z and S samples (table5 and table6): Noterdaeme et al.
(2008A&A...481..327N 2008A&A...481..327N)
D = DLA system with peculiar nucleosynthetic abundances
See Cooke et al. (2010MNRAS.409..679C 2010MNRAS.409..679C).
The quasar is also known as UM 673A
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Ref Reference code
5- 23 A19 --- BibCode BibCode
25- 49 A25 --- Aut Author's name
52-103 A52 --- Com Comments
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Acknowledgements:
Giovanni Vladilo, vladilo(at)oats.inaf.it
History:
* 03-May-2011: table8
* 30-Aug-2011: tables 4-7 added
(End) Patricia Vannier [CDS] 14-Apr-2011