Further data on the blue ring-like structure in A 370.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1987
- Bibcode:
- 1987A&A...184L...7S
- Keywords:
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- Blue Stars;
- Emission Spectra;
- Galactic Clusters;
- Giant Stars;
- Gravitational Lenses;
- Line Spectra;
- Arcs;
- Red Shift;
- Spiral Galaxies;
- Stellar Evolution;
- Stellar Luminosity;
- Astrophysics