Lyman-alpha companions to high-z quasars
1991; IOP Publishing; Volume: 368; Linguagem: Inglês
10.1086/169667
ISSN1538-4357
AutoresE. M. Hu, A. Songaila, L. L. Cowie, Alan Stockton,
Tópico(s)Stellar, planetary, and galactic studies
Resumoview Abstract Citations (49) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Lyman- alpha Companions to High-z Quasars Hu, Esther M. ; Songaila, Antoinette ; Cowie, Lennox L. ; Stockton, Alan Abstract We report the results of a narrow-band filter search for Lyα companions to z > 2.8 quasars. Three out of 10 radio-loud quasars are found to have candidate Lyα 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 (<~ 6") and are consistent with being ionized by it. In addition to these survey data, we present imaging data in a line-free continuum band on the previously known companion to PKS 1614+051. Spectral energy distributions for this Lyα 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. We argue that the apparent lack of evolution in the quasar nebulosity strongly favors a tidal interaction model. Publication: The Astrophysical Journal Pub Date: February 1991 DOI: 10.1086/169667 Bibcode: 1991ApJ...368...28H Keywords: Galactic Structure; Interacting Galaxies; Lyman Alpha Radiation; Quasars; Radio Sources (Astronomy); Astronomical Spectroscopy; Charge Coupled Devices; Iue; Spectral Energy Distribution; Astrophysics; COSMOLOGY; GALAXIES: REDSHIFTS; GALAXIES: STRUCTURE; QUASARS; RADIO SOURCES: GALAXIES; RADIO SOURCES: SPECTRA full text sources ADS | data products SIMBAD (18) NED (18) MAST (1)
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