Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..580b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 580-594. Research supported by the Australian Resear
Astronomy and Astrophysics
Astrophysics
49
Bl Lacertae Objects, Intergalactic Media, Ultraviolet Spectra, Absorption Spectra, Iue, Lyman Alpha Radiation, Red Shift
Scientific paper
Spectra of the luminous high-redshift BL Lac object 0215+015 have been obtained with the IUE from 2300 to 3150 Å and with the AAT from 3040 to 3870 Å. A total of 66 absorption lines were detected, 50 of which can be identified in the six definite and one probable redshift systems ranging from zabs = 1.254 to zabs = 1.719. Strong unidentified lines found shortward of 3310 Å are assumed to be members of a sparse Lyα forest. This is the first reported detection of a Lyα forest in a BL Lac object. The intrinsic redshift of 0215+015 is likely to be near 1.7. From a detailed column density comparison it is shown that the zabs = 1.345 system is most probably an intervening galaxy, with the sight line intercepting both disk- and halo-type material.
Blades Chris J.
Hunstead Richard W.
Murdoch Hugh S.
Pettini Marco
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