Imaging of the gravitational lens system PG 1115+080 with the Hubble Space Telescope

Details Imaging of the gravitational lens system PG 1115+080 with the Hubble Space Telescope Imaging of the gravitational lens system PG 1115+080 with the Hubble Space Telescope

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1330k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1330-1336, 1698-1700.

Astronomy and Astrophysics

Astronomy

36

Gravitational Lenses, Quasars, Stellar Color, Stellar Luminosity, Astronomical Photometry, Image Processing, Mathematical Models, Spaceborne Astronomy

Scientific paper

This paper is the first of a series presenting observations of gravitational lenses and lens candidates, taken with the Wide Field/Planetary Camera of the HST. We have resolved the gravitational lens system PG 1115+080 into four point sources and a red, extended object that is presumably the lens galaxy; we present accurate relative intensities, colors, and positions of the four images, and lower accuracy intensity and position of the lens galaxy, all at the epoch 1991.2. Comparison with earlier data shows no compelling evidence for relative intensity variations between the QSO components having so far been observed. The new data agree with earlier conclusions that the system is rather simple, and can be produced by the single observed galaxy. The absence of asymmetry in the HST images implies that the emitting region of the quasar itself has an angular radius smaller than about 10 milliarcsec (100 pc for H0 = 50, q0 = 0.5).

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