Deep optical and radio observations of the gravitational lens system 2016 + 112

D. P. Schneider, C. R. Lawrence, M. Schmidt, J. E. Gunn, E. L. Turner, B. F. Burke, V. Dhawan

Research output: Contribution to journalArticlepeer-review

Abstract

New optical and radio observations of the gravitational lens system 2016 + 112 are presented. Deep optical images reveal the presence of an extremely red galaxy located in the midst of the three radio positions. There is no evidence for a cluster of galaxies in the region; the lensing appears to be dominated by the new galaxy and the galaxy associated with the third radio source. The A image has remained constant in brightness since its discovery nearly a year ago, but B has faded by about 0.3 mag. A new spectrum of B shows that the equivalent widths of its emission lines have increased by roughly a factor of 2. A wide-field radio map shows that the postulated third image must either be more than 100 times fainter than A and B, or else lie close to one of the detected radio sources. The discovery of the new lensing mass makes the geometry of this lens system somewhat easier to understand, but no model based only on idealized mass distributions at the locations of the two known galaxies can explain all the observed properties.
Original languageEnglish (US)
Pages (from-to)66-69
JournalAstrophysical Journal
Volume294
DOIs
StatePublished - Jul 1 1985

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