Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368...28h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 28-39.
Astronomy and Astrophysics
Astronomy
43
Galactic Structure, Interacting Galaxies, Lyman Alpha Radiation, Quasars, Radio Sources (Astronomy), Astronomical Spectroscopy, Charge Coupled Devices, Iue, Spectral Energy Distribution
Scientific paper
The results are reported of a narrow-band filter search for Ly-alpha companions to z more than 2.8 quasars. Three out of 10 radio-loud quasars are found to have candidate Ly-alpha companions, while no candidates are seen in seven optically selected quasars. Follow-up spectroscopy has confirmed two of the candidates, with one yet to be observed. All the companions lie close to the quasar and are consistent with being ionized by it. Imaging data in a line-free continuum band on the previously known companion to PKS 1614 + 051 are presented. Spectral energy distributions for this Ly-alpha companion, and for a second object lying between it and the quasar, are given, and discussed with comparison to flat-spectrum sources known in the literature. Both PKS 1614 + 051 and the three new systems show a striking similarity in sizes, luminosities, and morphologies with nebulosity seen around low-z quasars. It is argued that the apparent lack of evolution in the quasar nebulosity strongly favors a tidal interaction model.
Cowie Lennox L.
Hu Esther M.
Songaila Antoinette
Stockton Alan
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