Further data on the blue ring-like structure in A 370

Details Further data on the blue ring-like structure in A 370 Further data on the blue ring-like structure in A 370

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184l...7s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. L7-L9.

Astronomy and Astrophysics

Astrophysics

45

Blue Stars, Emission Spectra, Galactic Clusters, Giant Stars, Gravitational Lenses, Line Spectra, Arcs, Red Shift, Spiral Galaxies, Stellar Evolution, Stellar Luminosity

Scientific paper

The authors present the latest data collected in November 1986 on the very blue giant ring-like structure recently discovered in the center of the cluster Abell 370 (z = 0.374). The spectrum of the eastern end of the structure is analyzed in details: it does not show any of the strong emission lines characterizing a QSO, and all the typical features expected in a gas or in a galaxy at the cluster redshift are missing. Such a result seems to rule out several models involving in-situ star formation. Moreover, the large scale spectral energy distribution looks like the continuum of a spiral galaxy redshifted to z = 0.59. So, the interpretation in terms of gravitational lensing is proposed. The results of a multipoint mass model allows one to reconstruct the entire ring-like structure. However, some properties remain difficult to understand.

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