J/A+A/562/A88 QJ0643-5041 UVES spectra (Albornoz Vasquez+, 2014)
Molecular hydrogen in the zabs=2.66 damped Lyman-α absorber toward
QJ0643-5041.
Albornoz Vasquez D., Rahmani H., Noterdaeme P., Petitjean P., Srianand R.,
Ledoux C.
<Astron. Astrophys. 562, A88 (2014)>
=2014A&A...562A..88A 2014A&A...562A..88A
ADC_Keywords: QSOs ; Spectroscopy
Keywords: galaxies: ISM - quasars: absorption lines -
quasars: individual: QJ0643-5041 - cosmology: observations
Abstract:
Molecular hydrogen in the interstellar medium (ISM) of high-redshift
galaxies can be detected directly from its UV absorptions imprinted in
the spectrum of background quasars. Associated absorptions from HI and
metals allow for the study of the chemical enrichment of the gas,
while the analysis of excited species and molecules make it possible
to infer the physical state of the ISM gas. In addition, given the
numerous H2 lines usually detected, these absorption systems are
unique tools to constrain the cosmological variation of the
proton-to-electron mass ratio, µ.
We intend to study the chemical and physical state of the gas in the
H2-bearing cloud at zabs=2.658601 towards the quasar QJ0643-5041
(zem=3.09) and to derive a useful constraint on the variation of
µ.
We use high signal-to-noise ratio, high-resolution VLT-UVES data of
QJ0643-5041 amounting to a total of more than 23 hours exposure time
and fit the HI, metals, and H2 absorption features with
multiple-component Voigt profiles. We study the relative populations
of H2 rotational levels and the fine-structure excitation of neutral
carbon to determine the physical conditions in the H2-bearing cloud.
Description:
UVES data of QJ0643-5041.
Objects:
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RA (2000) DE Designation(s)
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06 43 27.00 -50 41 12.8 [TDZ97] QJ0643-5041 = QSO B0642-5038
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 159 63 List of spectra
sp/* . 126 Individual FITS files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lam.0 Lower value of wavelength interval
8 A1 --- --- [/]
9- 16 F8.2 0.1nm lam.1 Upper value of wavelength interval
18- 26 F9.7 0.1nm dlam Resolution in wavelength (Å/pix)
28- 32 I5 --- N Number of lines
34- 40 A7 --- Inst Instrument/receptor
42- 60 A19 "datime" Date Observation date and time
62-107 A46 --- FileName Name of FITS file in subdirectory sp
109-159 A51 --- FileNoise Name of file with noise, in subdirectory sp
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Acknowledgements:
Daniel Albornoz Vasquez, albornoz(at)iap.fr
(End) Patricia Vannier [CDS] 03-Feb-2014