J/A+A/629/A128 Spectra of molecular absorbers (Wallstrom+, 2019)
Chlorine-bearing molecules in molecular absorbers at intermediate redshifts.
Wallstrom S.H.J., Muller S., Roueff E., Le Gal R., Black J.H., Gerin M.
<Astron. Astrophys. 629, A128 (2019)>
=2019A&A...629A.128W 2019A&A...629A.128W (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Spectra, radio
Keywords: quasars: absorption lines - quasars: individual: PKS 1830-211 -
quasars: individual: B 0218+357 - galaxies: ISM -
galaxies: abundances - radio lines: galaxies
Abstract:
We use observations of chlorine-bearing species in molecular absorbers
at intermediate redshifts to investigate chemical properties and
35Cl/37Cl isotopic ratios in the absorbing sightlines. Chloronium
(H2Cl+) is detected along three independent lines of sight in the
z=0.89 and z=0.68 molecular absorbers located in front of the lensed
quasars PKS 1830-211 and B 0218+357, respectively. Hydrogen chloride
(HCl) was observed only toward PKS 1830-211, and is found to be-have
differently from H2Cl+. It is detected in one line of sight with
an abundance ratio [H2Cl+]/[HCl]∼1, but remains undetected in the
other, more diffuse, line of sight, with a ratio [H2Cl+]/[HCl]>17.
The absorption profiles of these two chlorine-bearing species are
compared to other species and discussed in terms of the physical
properties of the absorbing gas. Our findings are consistent with the
picture emerging from chemical models where different species trace
gas with different molecular hydrogen fraction. The 35Cl/37Cl
isotopic ratios are measured in the different lines of sight and are
discussed in terms of stellar nucleosynthesis.
Description:
Absorption spectra towards MA0.89 SW, MA0.89 NE, and MA0.68,
normalized to the continuum, showing lines of o-H2Cl+,
p-H2Cl+, and HCl. The two columns in each file are Sky frequency
(GHz) and intensity relative to the continuum.
Objects:
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RA (2000) DE Designation(s)
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18 33 39.92 -21 03 39.9 PKS 1830-211 = QSO B1830-211
02 21 05.5 +35 56 14 B 0218+357 = QSO B0218+357
--------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 61 8 List of spectra
sp/* . 8 Individual spectra
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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- 13 A13 --- QSO QSO name
14- 22 A9 --- Abs Molecular absorbed anme
24- 38 A15 --- Line Observed line
40- 61 A22 --- FileName Name of the spectrum file in subdirectory sp
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 14 F14.10 GHz Freq Sky frequency
17- 32 F16.14 --- Int Intensity relative to the continuum
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Acknowledgements:
Sofia Wallstrom, shj.wallstrom(at)gmail.com
(End) Patricia Vannier [CDS] 13-Aug-2019