Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370...78h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, March 20, 1991, p. 78-101. Research supported by NATO and Lawrence Liv
Astronomy and Astrophysics
Astrophysics
98
Active Galactic Nuclei, Image Analysis, Interstellar Matter, Quasars, Red Shift, Spatial Resolution, Absorption Spectra, Astronomical Spectroscopy, Lyman Alpha Radiation, Nebulae, Radio Galaxies
Scientific paper
U and B continuum and Ly-alpha images obtained with the UV-flooded TI2 CCD at the prime focus of the 4-m telescope at KPNO during May and November 1988 are reported for 19 radio-loud high-redshift QSOs. The data are presented in extensive contour maps, radial surface-brightness profiles, and tables and discussed in detail. Ly-alpha emission with typical luminosity about 10 to the 44th erg/sec and spatial extent about 100 kpc is spatially resolved in 15 QSOs, and these nebulae are attributed to the photoionization of the interstellar or intergalactic medium of young or proto galaxies by radiation escaping anisotropically along the radio axis of the QSO. The mechanisms possibly responsible for the Ly-alpha emission and for the UV 'fuzz' seen around some of the QSOs are explored.
Breugel Wil van
Heckman Timothy M.
Lehnert Matthew D.
Miley George K.
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