Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182l..21m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 1, Aug. 1987, p. L21-L24. Research supported by the Minerva Gesellsch
Astronomy and Astrophysics
Astrophysics
12
Astronomical Models, Galactic Clusters, Light Scattering, Quasars, Echoes, Geometry, Ultraviolet Radiation, X Ray Sources
Scientific paper
The author examines and elaborates on the light-echo model proposed by Katz (1987) for the luminous arcs in galaxy clusters. Some new results that follow mainly from the geometry of the model are deduced. The author points out that only a partial arc due to beaming of the source's radiation may be seen. Arcs can thus tell us about quasar beaming. Also, it is suggested that the width of the observed arc may result from the finite thickness of the scattering layer as well as from the finite duration of the burst. In the former case an arc with a constant width (for a constant thickness) is expected. In the latter case, the width of the image varies along the arc by a large factor. It is proposed that the light from the arcs may be due to reemission from atoms that are excited by a UV or an X-ray burst from the central source (as a possible alternative to genuine scattering). Very different predictions follow from the two alternatives.
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