A high-resolution study of the absorption spectra of three QSOs - Evidence for cosmological evolution in the Lyman-alpha lines

Details A high-resolution study of the absorption spectra of three QSOs - Evidence for cosmological evolution in the Lyman-alpha lines A high-resolution study of the absorption spectra of three QSOs - Evidence for cosmological evolution in the Lyman-alpha lines

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252...10y&link_type=abstract

Astrophysical Journal, Part 1, vol. 252, Jan. 1, 1982, p. 10-31. Research supported by the Science Research Council of England

Mathematics

Logic

102

Absorption Spectra, Astronomical Spectroscopy, Big Bang Cosmology, Galactic Evolution, Lyman Alpha Radiation, Quasars, High Resolution, Line Spectra, Red Shift, Ultraviolet Spectra, Velocity Distribution

Scientific paper

High-resolution (0.8 Å FWHM) spectroscopic observations over the wavelength range from 3260 Å to 4900 Å are presented for the QSOs Q0002+051 (Zem = 1.899), Q0421+019 (Zem = 2.051), and the gravitationally lensed QSO, Q1115+080 (Zem = 1.725). We find, respectively, 28, 53, and 21 absorption lines in these three objects, from which a total of 11 absorption line systems are identified. Two of the QSOs show galactic Ca II λλ3934, 3969 absorption. Four absorption systems with Zabs > Zem are seen in Q1115+080; the velocities range from -360 to -1130 km s-1 relative to the QSO. Line profile fits to the absorption spectra are used to determine column densities and velocity dispersions within the absorbing clouds. Highly ionized lines of C IV λλ1548, 1550, N V λλ1238, 1242, and Si IV λλ1393, 1402 are seen in many of the absorption systems.
The many unidentified lines shortward of Ly emission are used to form an expanded sample of single Lyα absorption lines. The new data provide good statistics for Zabs < 2 and reveal a number density per unit redshift N(Z) = N0(1 + Z)γ with y = 1.81 ± 0.48. This suggests a modest amount of cosmological evolution in the sense that there are more Lyα absorption lines at higher redshifts. The properties of the equivalent width spectrum of Lyα lines and the flatness of their two-point correlation function are in accord with our previous study.

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