J/A+A/528/A12 QSOs CaII absorbers (Richter+, 2011)
The neutral gas extent of galaxies as derived from weak intervening Ca II
absorbers.
Richter P., Krause F., Fechner C., Charlton J.C., Murphy M.T.
<Astron. Astrophys., 528, A12 (2011)>
=2011A&A...528A..12R 2011A&A...528A..12R
ADC_Keywords: QSOs ; Redshifts ; Equivalent widths
Keywords: galaxies: halos - galaxies: formation - galaxies: ISM -
intergalactic medium - quasars: absorption lines
Abstract:
We present a systematic study of weak intervening CaII absorbers at
low redshift (z<0.5), based on the analysis of archival
high-resolution (R≥45000) optical spectra of 304 quasars and
active galactic nuclei observed with VLT/UVES. Along a total redshift
path of {DELTA}z≈100 we detected 23 intervening CaII absorbers in
both the CaII H & K lines, with rest frame equivalent widths
Wr,3934=15-799mÅ and column densities logN(CaII)=11.25-13.04
(obtained by fitting Voigt-profile components).
Description:
For our CaII survey we made use of the ESO data archive and retrieved
all publically available (as of Sep. 2008) absorption-line data for
low- and high-redshift QSOs observed with the Ultraviolet and Visual
Echelle Spectrograph (UVES) on the VLT. This enormous data archive
(Spectral Quasar Absorption Database, SQUAD; PI: M.T. Murphy) provides
high-quality spectral data for ∼400 quasars and active galactic nuclei
(AGN). Most of these spectra were taken in the UVES standard
configuration using the 1" slit, providing a spectral resolution of
R∼45000 (corresponding to a velocity resolution of ∼6.6km/sFWHM). Only
a few spectra have been observed at slightly higher spectral
resolution, up to R∼60000. The spectral coverage as well as the
signal-to-noise ratio (S/N) varies substantially among the spectra,
reflecting the various scientific goals of the original proposals.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 23 QSO names, redshifts and ions of 23 intervening CaII
absorbers at z=0-0.5 detected in our QSO sample
table2.dat 75 23 Column densities, absorption components, velocity
widths and equivalent widths for the 23 intervening
CaII absorbers
tablea1.dat 49 69 Results from Voigt-profile fitting of intervening
CaII absorbers
tablea2.dat 22 11 List of additional CaII candidate systems
tablea3.dat 29 304 Complete list of QSOs in our data sample with mean
S/N and CaII redshift path (dz)
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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- 14 A14 --- QSO QSO name (JHHMMSS+DDMMSS)
16- 27 A12 --- Name Alternative name
29- 35 F7.5 --- zabs Absorption redshift
37- 39 A3 --- Bias [yes no] Bias flag (1)
41- 61 A21 --- IonD Detected ions (2)
64- 66 A3 --- IonU Undetected ions (2)
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Note (1): Bias flag indicates whether the observations were targeted
observations (see Sect 3.2).
Note (2): Only absorption by CaII, MgII, FeII, and NaI
is considered in this study.
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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- 14 A14 --- QSO QSO name (JHHMMSS+DDMMSS)
16- 22 F7.5 --- zabs Absorption redshift
24- 28 F5.2 [cm-2] logN(CaII) CaII column density
30- 33 F4.2 [cm-2] e_logN(CaII) rms uncertainty on logN(CaII)
35 I1 --- NCaII Number of CaII absorption components per
system; see Table A.1
37- 39 I3 km/s DVCaII CaII velocity width
41- 43 I3 0.1pm W(CaII) CaII 3934Å equivalent width
45- 46 I2 0.1pm e_W(CaII) rms uncertainty on W(CaII)
48- 49 A2 --- l_DVMgII [≥ ] Limit flag on DVMgII
50- 52 I3 km/s DVMgII ?=- MgII velocity width
54- 55 A2 --- l_W(MgII) [≥ ] Limit flag on W(MgII)
56- 59 I4 0.1pm W(MgII) ?=- MgII 2796Å equivalent width
61- 62 I2 0.1pm e_W(MgII) ? rms uncertainty on W(MgII)
64- 65 A2 --- l_logN(NaI) [≤ ] Limit flag on logN(NaI)
66- 70 F5.2 [cm-2] logN(NaI) ?=- NaI column density
72- 75 F4.2 [cm-2] e_logN(NaI) ? rms uncertainty on logN(NaI)
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- QSO QSO name (JHHMMSS+DDMMSS)
16- 22 F7.5 --- zabs Absorption redshift
24 I1 --- Comp [1/9] Composant number
26- 29 I4 km/s RV Radial velocity
31- 35 F5.2 [cm-2] logN(CaII) CaII column density
37- 40 F4.2 [cm-2] e_logN(CaII) rms uncertainty on logN(CaII)
42- 45 F4.1 km/s b Velocity width
47- 49 F3.1 km/s e_b rms uncertainty no b
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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- 14 A14 --- QSO QSO name (JHHMMSS+DDMMSS)
16- 22 F7.5 --- zabs Absorption redshift
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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- 3 I3 --- Seq Sequential number
5- 19 A15 --- QSO QSO name (JHHMMSS+DDMMSS)
21- 23 I3 --- S/N S/N per resolution element
25- 29 F5.3 --- dz Mean CaII redshift path
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Aug-2011