Spatially resolved STIS spectra of the gravitationally lensed BAL quasar APM08279+5255: the nature of component C and evidence for microlensing

Details Spatially resolved STIS spectra of the gravitationally lensed BAL quasar APM08279+5255: the nature of component C and evidence for microlensing Spatially resolved STIS spectra of the gravitationally lensed BAL quasar APM08279+5255: the nature of component C and evidence for microlensing

2002-05-24

arxiv.org/abs/astro-ph/0205416v1

Mon.Not.Roy.Astron.Soc. 334 (2002) L7

Astronomy and Astrophysics

Astrophysics

5 pages, accepted for publication as a letter in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05700.x

While gravitationally lensed quasars are expected to display an odd number of images, invariably systems are observed with an even number of quasars. For this, lensing galaxies must have very small core radii; this provides strong demagnification of one of the images. High resolution imaging of the gravitationally lensed BAL quasar, APM08279+5255, reveals three point-like images. As these images possess similar colours, it has been suggested that each represents a lensed image. Here, spatially resolved spectra of the individual components, obtained with STIS on the HST, are presented, clearly revealing that each is an image of the quasar. This confirms that APM08279+5255 represents the first example of an odd-image gravitationally lensed system. The implications for the properties of the lensing galaxy are discussed. It is also found that the individual images possess spectral differences indicative of the influence of gravitational microlensing in this system.

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