Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..508r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 508-514. NWO-supported research.
Other
28
Absorption Spectra, Hydrogen Atoms, Interstellar Gas, Line Spectra, Molecular Clouds, Quasars, Astronomical Spectroscopy, Calcium, H Lines, Potassium, Radio Spectra, Visible Spectrum
Scientific paper
Optical absorption spectroscopy is presented for the Ca II K and H lines along the sight line to the quasar PKS 0837 - 120, which lies in the direction of a high-velocity cloud (HVC) detected in H I 21-cm emission at V(LSR) = +105 km/sec. The data show Ca II absorption due to the HVC as well as a lower-velocity interstellar component. The column density ratio N(Ca II)/N(H I) for the HVC is about 1.6 x 10 to the -7th, with an uncertainty of approximately a factor of 2. This calcuim abundance is approximately one tenth the solar ratio of Ca/H, and higher than the level of Ca II found in the other detections of this species in an HVC. Thus the gas in the HVC toward PKS 0837 - 120 has undergone considerable heavy element enrichment and little depletion of Ca onto grains.
Hulsbosch Adrianus Nicolaas Maria
Morton Donald C.
Murray David J.
Robertson Gordon J.
Schwarz Ulrich J.
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