Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419l..13h&link_type=abstract
Astrophysical Journal Letters v.419, p.L13
Astronomy and Astrophysics
Astronomy
19
Cosmology: Observations, Galaxies: Quasars: Absorption Lines, Galaxies: Quasars: Individual Alphanumeric: Phl 957, Galaxies: Quasars: Individual Alphanumeric: 0528-250, Galaxies: Quasars: Individual Alphanumeric: 0836+113
Scientific paper
We have searched for Hα and Hβ emission in the high-z damped Lyα systems toward the quasars PHL 957, Q0528-250, and Q0836+ 113. We failed to detect the Balmer lines with 2 σ upper limits on Hα of around 2 x 10^-16^ ergs cm^2^ s^-1^, with similar limits on [O III] and Hβ for the first two systems. The results suggest that the weak or undetectable Lyα emission in these systems is not simply a consequence of dust destruction, but reflects a relatively low star-formation rate. For the Lyα emitting companion to PKL 957 we report an Hα flux of 3.6 +/- 1.5 x 10^-16^ ergs cm^2^ s^-1^, implying f(Lyα)/f(Hα) >= 1.6 and suggesting that Lyα cannot be reduced by more than a factor of 10 in this object.
Cowie Lennox L.
Hodapp Klaus W.
Hu Esther M.
Songaila Antoinette
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