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Absorption Structure in the BL LAC Object 0215+015 at 20 KM S−1 Resolution

  • R. W. Hunstead (a1), H.S. Murdoch (a1), M. Pettini (a2) and J. C. Blades (a3)

Extract

The origin of the narrow metal absorption lines in the spectra of QSOs remains uncertain despite the large amount of high-quality data obtained at high resolution over the past decade. Recently, statistical tests of a uniform sample of C IV absorption systems have shown that their redshift distribution is consistent with the view that these lines arise in randomly distributed intervening galaxies in a Friedmann Universe (Young, Sargent and Boksenberg 1982, hereafter YSB). In a complementary approach we consider in detail the physical properties of the absorbing material in cases of particular interest. We have chosen the high-redshift BL Lac object 0215+015 (Blades et al. 1982, hereafter BHMP) for detailed spectroscopic study because it is currently in a bright phase (V ∼ 14.5–16.5) and because it has several strong absorption systems with differing ionization structure. From our medium-resolution spectra of 0215+015 (BHMP) it appears that the density of C IV systems per unit redshift in this object is somewhat higher than, but not inconsistent with, the average density in the YSB sample.

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Copyright

References

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Abell, G.O.: 1977, Astrophys. J. 213, pp. 327344.
Blades, J.C., Hunstead, R.W., Murdoch, H.S. and Pettini, M.: 1982. Mon. Not. R. Astr. Soc. 200, pp. 10911111.
Falle, S.A.E.G., Perry, J.J. and Dyson, J.E.: 1981, Mon. Not. R. Astr. Soc. 195, pp. 397427.
Godwin, J.G.: 1976, , University of Oxford.
Young, P., Sargent, W.L.W. and Boksenberg, A.: 1982. Astrophys. J. Suppl. Ser. 48, pp. 455505.

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