J/MNRAS/404/1321 TiII in Milky way and Magellanic clouds (Welty+, 2010)
Interstellar Ti II in the Milky way and Magellanic clouds.
Welty D.E., Crowther P.A.
<Mon. Not. R. Astron. Soc., 404, 1321-1348 (2010)>
=2010MNRAS.404.1321W 2010MNRAS.404.1321W
ADC_Keywords: Interstellar medium ; Abundances ; Spectroscopy
Keywords: ISM: abundances - ISM: lines and bands - galaxies: ISM -
Magellanic Clouds
Abstract:
We discuss several sets of TiII absorption-line data, which probe a
variety of interstellar environments in our Galaxy and in the
Magellanic Clouds. Comparisons of high-resolution [full width at
half-maximum (FWHM)∼1.3-1.5km/s] TiII spectra of Galactic targets with
corresponding high-resolution spectra of NaI, KI and CaII reveal both
similarities and differences in the detailed structure of the
absorption-line profiles - reflecting component-to-component
differences in the ionization and depletion behaviour of those
species. Moderate-resolution (FWHM∼3.4-4.5km/s) spectra of more
heavily reddened Galactic stars provide more extensive information on
the titanium depletion in colder, denser clouds - where more than 99.9
per cent of the Ti may be in the dust phase. Moderate-resolution
(FWHM∼4.5-8.7km/s) spectra of stars in the Magellanic Clouds suggest
that the titanium depletion is generally much less severe in the Large
and Small Magellanic Clouds than in our Galaxy [for a given N(Htot),
E(B-V), or molecular fraction f(H2)]- providing additional evidence
for differences in depletion patterns in those two lower-metallicity
galaxies. We briefly discuss possible implications of these results
for the interpretation of gas-phase abundances in quasi-stellar object
absorption-line systems and of variations in the D/H ratio in the
local Galactic interstellar medium.
Description:
The spectroscopic data collected in this survey were obtained using
either the Kitt Peak 0.9-m coude feed telescope and echelle
spectrograph or the ESO/VLT UT2 telescope and UVES spectrograph
between 1994 Sep and 2004 Dec.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 50 286 Component structures for Galactic sight lines
for which high-resolution (FWHM<2km/s) CaII
spectra are available
tablea2.dat 58 404 *314 Galactic sight lines for which TiII data
(λ3383 equivalent widths and/or
column density estimates) are available
notes.dat 95 24 References to tablea2.dat
tablea3.dat 77 82 QSOALS TiII column densities
refs.dat 87 27 References to tablea3.dat
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Note on tablea2.dat: All column densities have been scaled to f(3383)=0.358
(Morton, 2003ApJS..149..205M 2003ApJS..149..205M).
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See also:
J/ApJS/171/29 : UCSD/Keck damped Lyα abundance database (Prochaska+ 2007)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 16 A7 --- Run Run(s) (1)
19- 21 F3.1 km/s e_HV ? Typical 3σ uncertainties on HV (2)
24- 25 I2 --- m_Star Star Component number
27- 31 F5.1 km/s HV Heliocentric velocity
33- 36 F4.2 km/s b b-value (line width) of TiII
37 A1 --- r_b Fixed value of b (3)
40 A1 --- l_NTiII Limit flag on NTiII (3σ)
41- 44 F4.1 10+10cm-2 NTiII TiII column density
45 A1 --- n_NTiII Fixed value of NTiII (3)
46 A1 --- l_TiII/CaII Limit flag on TiII/CaII (3σ)
47- 50 F4.2 --- TiII/CaII ?=- TiII/CaII column density ratio
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Note (1): Runs as follows:
H79 = Hobbs, 1979ApJ...229L.129H 1979ApJ...229L.129H
K94 = 1994 Sep, KPNO/coude (cam 6)
K95 = 1995 Apr, KPNO/coude (cam 6)
V00 = 2000 Nov, KPNO/coude (cam 5)
V03 = 2003 Nov, ESO/VLT (UT2) + UVES
Note (2): Typical 3σ uncertainties for a single component with b=2km/s
and include both photon noise and continuum placement uncertainties.
Note (3): Notes as follows:
] = values were fixed in the fits, but are fairly well determined
) = values were fixed in the fits, but are less well determined
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Name
20- 21 I2 --- Note Note number, in notes.dat file
23 A1 --- l_EW Limit flag on EW
24- 28 F5.1 0.1nm EW ?=- TiII equivalent width
30- 33 F4.1 0.1nm e_EW ? rms uncertainty on EW
35 A1 --- l_N(AOD) Limit flag on N(AOD)
36- 40 F5.2 10+10cm-2 N(AOD) ?=- TiII column density obtained by
integrating the "apparent" optical
depth (AOD) over the line profile
42- 45 F4.2 10+10cm-2 e_N(AOD) ? rms uncertainty on N(AOD)
46 A1 --- n_N(AOD) [)] ) if N(AOD) obtained either directly
from the equivalent width
48 A1 --- l_Nfit Limit flag on Nfit
49- 53 F5.2 10+10cm-2 Nfit ? TiII column density obtained via a
detailed multi-component fit to the line
profile (1)
55- 58 F4.2 10+10cm-2 e_Nfit ? rms uncertainty on Nfit
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Note (1): which (in principle) can account for any saturation effects
(if the b-values are well determined)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Note Note number, for data origins
4- 22 A19 --- BibCode Bibcode
24- 46 A23 --- Aut Author's name
48- 95 A48 --- Com Comments
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- QSO QSO name
12 A1 --- Note [*] Averaged values (1)
14- 19 F6.4 --- z ?=- Redshift
21 A1 --- l_HI Limit flag on HI
22- 26 F5.2 --- HI ?=- HI column density
28 A1 --- l_H2 Limit flag on H2
29- 33 F5.2 --- H2 ?=- H2 column density
35 A1 --- l_ZnII Limit flag on ZnII
36- 40 F5.2 --- ZnII ?=- ZnII column density
42 A1 --- l_[Zn/H] Limit flag on [Zn/H]
43- 47 F5.2 --- [Zn/H] ?=- [Zn/H] relative abundance
49 A1 --- l_CaII Limit flag on CaII
50- 54 F5.2 --- CaII ?=- CaII column density
56 A1 --- l_TiII Limit flag on TiII
57- 61 F5.2 --- TiII ?=- TiII column density
63 A1 --- l_[Ti/Zn] Limit flag on [Ti/Zn]
64- 68 F5.2 --- [Ti/Zn] ?=- [Ti/Zn] relative abundance
70- 77 A8 --- Ref References, in refs.dat file
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Note (1): The last three entries are for the averages of 27, 13, and 14
CaII-selected systems seen in lower resolution, lower S/N spectra from
the Sloan Digital Sky Survey (Wild et al., 2006MNRAS.367..211W 2006MNRAS.367..211W).
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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- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 48 A25 --- Aut Author's name
50- 87 A38 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Nov-2010