Confirmation of two extended objects along the line of sight to PKS1830-211 with ESO-VLT adaptive optics imaging

Details Confirmation of two extended objects along the line of sight to PKS1830-211 with ESO-VLT adaptive optics imaging Confirmation of two extended objects along the line of sight to PKS1830-211 with ESO-VLT adaptive optics imaging

2005-06-27

arxiv.org/abs/astro-ph/0506634v1

Astronomy and Astrophysics

Astrophysics

Accepted in A&A Letters

Scientific paper

10.1051/0004-6361:200500145

We report on new high-resolution near-infrared images of the gravitationally lensed radio source PKS1830-211, a quasar at z=2.507. These adaptive optics observations, taken with the Very Large Telescope (VLT), are further improved through image deconvolution. They confirm the presence of a second object along the line of sight to the quasar, in addition to the previously known spiral galaxy. This additional object is clearly extended in our images. However, its faint luminosity does not allow to infer any photometric redshift. If this galaxy is located in the foreground of PKS1830-211, it complicates the modeling of this system and decreases the interest in using PKS1830-211 as a means to determine H0 via the time delay between the two lensed images of the quasar.

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