Multiple components in the Z = 0.424 absorption system in the spectrum of the BL Lacertae object PKS 0735+178

Details Multiple components in the Z = 0.424 absorption system in the spectrum of the BL Lacertae object PKS 0735+178 Multiple components in the Z = 0.424 absorption system in the spectrum of the BL Lacertae object PKS 0735+178

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..370b&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 370-379. Research supported by the Science Research Council of Engla

Astronomy and Astrophysics

Astrophysics

45

Absorption Spectra, Bl Lacertae Objects, Interstellar Matter, Red Shift, Abundance, Astronomical Spectroscopy, Galactic Radiation, Hydrogen Clouds, Magnesium, Spectral Resolution

Scientific paper

Accurate high-resolution (effective instrumental FWHMs of 0.74 and 0.41 A) optical measurements of the redshifted (z = 0.424) Mg II h and k absorption lines in the BL Lac object PKS 0735+178 are reported. A weak absorption line at 4062.4 A in the same redshift system is identified as Mg I 2853.0 A, and a pair of lines due to Ca II H and K absorption by interstellar gas in the Galaxy is found. The high spectral resolution reveals the presence of considerable structure in the redshifted lines, which invalidates the single-cloud assumption of previous analyses. A refined analysis of the observations based on multiple-cloud models is performed in an attempt to obtain the characteristics of each identified component. The relative abundances of Mg, Fe, Mn, and H are discussed, and parameters are derived for the Galactic Ca II absorbing region intercepted in the line of sight. It is concluded that the characteristics of the z = 0.424 complex are consistent with the interpretation that the absorption arises in gas associated with an intervening galaxy in the line of sight to PKS 0735+178.

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