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Combined-Array Imaging of Extra-Galactic Radio Sources

Published online by Cambridge University Press:  12 April 2016

Chidi E. Akujor  and
Lars B. Bååth
Chidi E. Akujor
Affiliation:
Onsala Space Observatory, Onsala, S 439 92, Sweden
Lars B. Bååth
Affiliation:
Onsala Space Observatory, Onsala, S 439 92, Sweden

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The resolving powers of existing telescope arrays are quite different. For example the extended new MERLIN at 5 GHz readily yields maps of ~ 50 mas resolution compared with the VLA ~ 350 mas, WSRT ~ 4000 mas, EVN ~ 5 mas, global VLBI ~ 1 mas, etc. This means that images obtained with these instruments yield information on different scales that sometimes appear unrelated. However, the need to have structural information on intermediate scales demands that data from different arrays be combined to make a single image. This is particularly important in extra-galactic radio sources where the relationship between core-jet features on different scales (parsec and kiloparsec) and the connection between small-scale and extended features need to be established.

By combining uvdata from two or more arrays we can routinely make images that represent a balance between the capabilities of the combined arrays, (e.g. VLA + MERLIN, MERLIN+VLBI, VLA+WSRT etc) at cm wavelengths. In order to do this, one has to overcome a number of calibration and mapping difficulties (see Zhang et al. 1991; Akujor et al. 1992, in prep.).

Type
2. Technical Innovations
Information
International Astronomical Union Colloquium , Volume 140: Astronomy with Millimeter and Submillimeter Wave Interferometry , 1994 , pp. 123 - 124
Copyright
Copyright © Astronomical Society of the Pacific 1994

References

Brown, R.L., 1991, eds Cornwell, T.J. & Perley, R. A., Radio Interferometry: Theory, Techniques and Applications, PASP conf. series, 410.Google Scholar
Padin, et al., 1991, eds Cornwell, T.J. & Perley, R. A., Radio Interferometry:Theory, Techniques and Applications, PASP conf. series, p400.Google Scholar
Zhang, F.J. et al. 1991, MNRAS, 250, 650.Google Scholar