Observations of nickel, chromium, and zinc in QSO absorption-line systems

Details Observations of nickel, chromium, and zinc in QSO absorption-line systems Observations of nickel, chromium, and zinc in QSO absorption-line systems

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363...57m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 1, 1990, p. 57-65. Research supported by Northwestern University.

Astronomy and Astrophysics

Astrophysics

74

Absorption Spectra, Chromium, Metallicity, Nickel, Quasars, Zinc, Abundance, Galactic Evolution, Interstellar Matter, Lyman Alpha Radiation, Red Shift

Scientific paper

New observations of Ni II, Cr II, and Zn II in several damped Ly-alpha QSO absorption-line systems at z about 2 are presented. Using the N(Zn II)/N(H I) ratio as a probe of the metallicity and N(Cr II)/N(Zn II) as a measure of the dust content, it is found that the heavy-element abundances in the z = 1.921 system toward the QSO 2206-199N are 20 percent solar and that the dust-to-gas ratio is 11 percent of the Galactic disk value. The observations of these species in the z = 2.309 system toward PHL 957 yield a more extreme metallicity (4 percent solar) and dust-to-gas ratio (3 percent Galactic). In addition, a depletion of Ni in the z = 2.039 absorber toward PKS 0458 - 020 and an absence of C I absorption in the z about 2 damped systems toward 1215 + 333 and 2359 - 022 are found which are consistent with a lack of dust. Among the four damped systems whose Ni, Cr, and Zn abundances have been examined quantitatively to date, all show convincing evidence of much lower metallicities and dust content than the Galactic disk. The implications of these results with regard to the interpretation of the high-redshift damped Ly-alpha systems as an evolving population of young galaxies are discussed.

Affiliated with

Also associated with

No associations

Rating

Observations of nickel, chromium, and zinc in QSO absorption-line systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Observations of nickel, chromium, and zinc in QSO absorption-line systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of nickel, chromium, and zinc in QSO absorption-line systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-839374