An Unusual High Redshift Object Discovered with the Hubble Space Telescope / HST - Peculiar Starburst Galaxy or New Gravitational Lens

Details An Unusual High Redshift Object Discovered with the Hubble Space Telescope / HST - Peculiar Starburst Galaxy or New Gravitational Lens An Unusual High Redshift Object Discovered with the Hubble Space Telescope / HST - Peculiar Starburst Galaxy or New Gravitational Lens

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.270l..63g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 270, NO. 4/OCT15, P. L63, 1994

Astronomy and Astrophysics

Astronomy

10

Scientific paper

We report the discovery of an object with a very peculiar structure, using observations from the refurbished Hubble Space Telescope (HST) as part of the Medium-Deep Survey project. The object includes four compact blue components arranged around an extended red component, with mutual separations of <1 arcsec. Using a ground-based spectrum as an additional constraint, we consider the plausibility of two solutions to the structural problem. First, the blue components could be individual supergiant HII regions sitting in a host spiral or irregular galaxy which they dominate. Secondly, the system could be gravitationally lensed, where the blue components are all images of a single background source. In this case, a severe limit can be placed on the size of the emitting region, and the system has considerable potential for studies of H_0_ because of the short time-delay. A high mass-to-light ratio, compared with those known for low-redshift galaxies, however, would be required to produce the observed image separation.

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