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Redshifted formaldehyde from the gravitational lens B0218+357
Astronomy and Astrophysics
The gravitational lens toward B0218+357 offers the unique possibility to study cool moderately dense gas with high sensitivity and angular resolution in a cloud that existed half a Hubble time ago. Observations of the radio continuum and six formaldehyde (H2CO) lines were carried out with the VLA, the Plateau de Bure interferometer, and the Effelsberg 100-m telescope. Three radio continuum maps indicate a flux density ratio between the two main images, A and B, of 3.4 +/- 0.2. Within the errorsdoi:10.1051/0004-6361:20077353 fatcat:4qp3dqivkjc6navjcnezej7dze