Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232...16g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 16-18.
Astronomy and Astrophysics
Astronomy
1
Elliptical Galaxies, Gravitational Lenses, Infrared Imagery, Quasars, Infrared Astronomy, Infrared Radiation, Seeing (Astronomy)
Scientific paper
A good seeing IR image in the K (2.2 micron) band of the twin quasar QSO 0957+561 A,B is reported. The image reveals that at this wavelength the B component is four times brighter than A and is clearly extended. The component B is unambiguously identified as the merging of the QSO image B and of the lensing galaxy found at visible and radio wavelength, 0.76 arcsec N-E of the quasar image. The set of data is consistent with the superposition of a point source and an extended galaxy. The brightness profile of the galaxy, measured up to a diameter of 6 arcsec, is much less affected by the quasar image than in the visible. It can be fitted by a spiral disk distribution, but that would be of abnormally large dimensions and luminosity. A much better fit is obtained assuming a giant cD elliptical galaxy (brightest member of the cluster) with an extended halo. The size and importance of the fitted halo are typical of this class of galaxy.
Gallais Pascal
Lacombe Francois
Rouan Daniel
Tiphene Didier
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