J/A+A/595/A96 QSO B0218+357 molecular absorption lines (Wallstroem+, 2016)
Isotopic ratios at z=0.68 from molecular absorption lines toward B0218+357.
Wallstroem S.H.J., Muller S., Guelin M.
<Astron. Astrophys. 595, A96 (2016)>
=2016A&A...595A..96W 2016A&A...595A..96W (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Spectroscopy
Keywords: quasars: absorption lines - quasars: individual: B0218+357 -
galaxies: ISM - galaxies: abundances - ISM: molecules -
radio lines: galaxies
Abstract:
Isotopic ratios of heavy elements are a key signature of the
nucleosynthesis processes in stellar interiors. The contribution of
successive generations of stars to the metal enrichment of the
Universe is imprinted on the evolution of isotopic ratios over time.
We investigate the isotopic ratios of carbon, nitrogen, oxygen, and
sulfur through millimeter molecular absorption lines arising in the
z=0.68 absorber toward the blazar B 0218+357. We find that these
ratios differ from those observed in the Galactic interstellar medium,
but are remarkably close to those in the only other source at
intermediate redshift for which isotopic ratios have been measured to
date, the z=0.89 absorber in front of PKS 1830-211. The isotopic
ratios in these two absorbers should reflect enrichment mostly from
massive stars, and they are indeed close to the values observed toward
local starburst galaxies. Our measurements set constraints on
nucleosynthesis and chemical evolution models.
Description:
ASCII files of the absorption spectra presented in Figure 2. The files
are named after the molecule or isotopologue. Column 1 is velocity,
column 2 is intensity (normalized to 1), Velocities are in a
heliocentric frame, with zabs=0.68466
Objects:
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RA (2000) DE Designation(s)
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02 21 05.5 +35 56 14 QSO B0218+357 = WN B0218.0+3542
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sp-c34s.dat 26 95 C34S absorption spectrum
sp-cs.dat 26 96 CS absorption spectrum
sp-h13cn.dat 26 111 H13CN absorption spectrum
sp-h13co.dat 26 111 H13CO absorption spectrum
sp-h234s.dat 26 109 H234S absorption spectrum
sp-h2s.dat 26 110 H2S absorption spectrum
sp-hc15n.dat 26 111 HC15N absorption spectrum
sp-hc17o.dat 26 111 HC17O absorption spectrum
sp-hc18o.dat 26 111 HC18O absorption spectrum
sp-hcn.dat 26 116 HCN absorption spectrum
sp-hco.dat 26 116 HCO absorption spectrum
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Byte-by-byte Description of file: sp*.dat
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Bytes Format Units Label Explanations
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3- 19 F17.13 km/s HV Velocity in heliocentric frame,
with zabs=0.68466
21- 26 F6.4 --- Int Normalized intensity (normalized to 1)
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Acknowledgements:
Sofia Wallstroem, shj.wallstrom(at)gmail.com
(End) Patricia Vannier [CDS] 10-Aug-2016