Very High Angular Resolution Imaging

Proceedings of the 158th Symposium of the International Astronomical Union Held at the Women's College, University of Sydney, Australia, 11-15 January 1993

By: J.G. Robertson (Editor), W.J. Tango (Editor)

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Hardcover | 1 May 2010

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The 1990s are proving to be a very exciting p&iod for high angular resolution astronomy. At radio wavelengths a combination of new array instruments and pow erful imaging algorithms have generated images of unprecedented resolution and quality. In the optical and infrared, the great technical difficulties associated with constructing separated-aperture interferometers have been largely overcome, and many new instruments are now operating or are being developed. As these pro grams start to produce observational results they will be able to draw extensively on the experience gained by the radio-interferometry community. Thus it seemed that the time was ripe for a meeting which would bring together workers from all wavelength ranges to discuss the details of the science and art of "Very High Angular Resolution Imaging" . While the main emphasis of Symposium No. 158 was on high resolution tech niques from the radio, mm-wave, infrared and optical bands, it also provided an opportunity for presentation of astronomical results from these techniques. As well as giving our colleagues from the Northern Hemisphere a break from midwinter, the location of the Symposium in Australia recognised the continuing development of astronomical interferometry in this country, especially the recent completion of the Australia Telescope radio array, and the progress toward com missioning of the Sydney University Stellar Interferometer. A number of the par ticipants visited these instruments during the post-symposium tour.

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Preface
Symposium Organizers and Sponsors
List of Participants
Seeing	p. 1
Comparing optical and radio - quantum issues	p. 11
Heterodyne interferometry in the infrared	p. 19
The SAO submillimeter wavelength array	p. 27
Imaging techniques: Limitations to the quality of images	p. 37
Surprise and sociology in multi-disciplinary sciences	p. 47
HST image restoration: current capabilities and future prospects	p. 61
Lunar occultations: from past to future achievements	p. 71
Beam combination for wide field imaging	p. 83
Direct maximum-entropy image reconstruction from the bispectrum	p. 91
Source-noise in radio synthesis images of polarized sources	p. 95
Phase calibration of the proposed millimeter array	p. 101
VLBA phase-referencing	p. 105
Radio arrays - mm to meters	p. 109
The Very Long Baseline Array	p. 117
Recent results from the VLBA	p. 125
MERLIN A phase-stable 'VLBI' array	p. 128
The Southern Hemisphere VLBI Experiment program, SHEVE	p. 131
The Sydney University Stellar Interferometer (SUSI)	p. 135
The VLT Interferometer	p. 143
The Big Optical Array	p. 151
Progress on G12T	p. 155
The COAST interferometer	p. 163
An adaptive steerable imaging array	p. 167
CIROI project	p. 171
The baseline metrology system of the USNO astrometric interferometer	p. 174
Design and construction of a beam combiner and related hardware	p. 177
An overview of the SUSI control system	p. 181
The fringe tracking servo in SUSI	p. 184
Motion of the delay lines of an optical interferometer when reconstructing an image by redundant spacing calibration	p. 187
The micro-precision interferometer testbed instrument design	p. 193
Phase and image reconstruction from pupil-plane observations in the near infrared: integration of the phasors	p. 197
Radio source variability as a tool for very high resolution	p. 201
Iterative blind deconvolution method with use of Lucy's algorithm: application to IR speckle data	p. 205
Speckle imaging with the bispectrum and without reference star	p. 209
CLEAN/MEM deconvolution errors: semicompact sources	p. 212
Generalized versus classical maximum entropy for imaging	p. 215
Super-resolution by phase-gradient unravelling	p. 218
Restoration over fields of view wider than the isoplanatic patch	p. 221
Differential diffraction in Michelson stellar interferometry	p. 224
Optical fibres in radioastronomy	p. 227
Recent developments in mm and sub-mm interferometry	p. 235
High resolution radio source maps at 73.8 MHz	p. 243
AIPS++: A new astronomical imaging package	p. 247
Latest technical developments at the infrared spatial interferometer	p. 257
Integrated optics in astronomical interferometry	p. 261
Adaptive optics: performance and limitations	p. 273
Laser guide star adaptive optics: present and future	p. 283
Laser guide star adaptive optics on the 1.5 m telescope at the Starfire Optical Range	p. 293
Minimum redundant aperture masking interferometry with tip-tilt wavefront correction	p. 296
Observations of seeing at 0.5 and 12.4 [mu]m	p. 299
Preliminary seeing measurements for SUSI	p. 302
Aspects of the theoretical performance of modal adaptive optics	p. 305
Simulation study of a low-light-level wavefront sensor driving a low-order, near-IR adaptive optics system	p. 308
Fringe visibility and phase measurements	p. 311
Speckle vs non-redundant masking	p. 317
MAPPIT: optical interferometry with non-redundant masks	p. 327
Optimal linear arrays for wide bandwidths	p. 331
High resolution and high sensitivity spectral-line imaging with multiple arrays	p. 334
High resolution imaging forty years ago	p. 337
Results with the extended MERLIN	p. 343
High resolution image reconstruction at Yunnan Observatory	p. 346
High resolution imaging at mm-wavelengths with the Hat Creek Array	p. 349
Miyun 232 MHz survey and some new imaging techniques	p. 352
Compact array mapping of the nuclear starburst in NGC 7552	p. 355
ATCA radio polarization observations of NGC 1566 and NGC 1672	p. 358
Fluctuations of polarized radiation in a random magnetoplasma	p. 361
High angular resolution observations of Her 36	p. 364
The Caltech-Jodrell Bank (CJ) VLBI snapshot surveys	p. 367
First experimental results from pupil masking on a solar telescope	p. 370
Optical interferometry in the multi-speckle mode	p. 373
Near infrared high angular resolution observations of stars and circumstellar regions by the technique of lunar occultations	p. 376
Diffraction-limited near infrared imaging of the central parsec of the Galaxy	p. 379
Long baseline interferometric observations of circumstellar dust shells at 11 microns	p. 383
High angular resolution observations of protostellar disks	p. 387
The extended H[alpha] component of T Tau	p. 391
An interferometric survey of Mira variables and M supergiants	p. 395
Speckle observations of solar granulation	p. 398
Comparison of HST and VLA images at 0.1" of the Orion nebula	p. 401
An HR diagram for the LMC from the medium deep survey	p. 404
Stellar diameters, limb darkening, extended atmospheres and shells: observations with the Mark III Interferometer	p. 407
Mark III Interferometer: milliarcsec "visual" orbits of spectroscopic binaries	p. 410
High resolution interferometric observations of eclipsing binary stars	p. 413
Lunar occultations of young stellar objects in the Taurus and Ophiuchus star forming regions	p. 416
Pupil plane interferometry: some conclusions from SCASIS	p. 419
HIRAS: high-resolution IRAS images	p. 422
The present status of astrometry at optical and radio wavelengths	p. 423
The USNO Astrometric Interferometer	p. 427
VLBI astrometry	p. 437
High precision differential astrometry in large angular separation pairs of radiosources	p. 445
Five years of stellar position measurements with the Mark III optical interferometer	p. 448
Imaging with a gravitational lens	p. 451
Radar imaging of the planets using the Very Large Array	p. 457
Limitations to optical/IR interferometry from the ground and space	p. 469
The ultimate radio resolution	p. 477
Progress of the Optical Very Large Array	p. 485
The cosmological application of very high angular resolution in radio astronomy	p. 493
Index of authors	p. 496
Index of subjects	p. 499
Index of objects	p. 501
Index of instruments	p. 503
Table of Contents provided by Blackwell. All Rights Reserved.

Very High Angular Resolution Imaging

Proceedings of the 158th Symposium of the International Astronomical Union Held at the Women's College, University of Sydney, Australia, 11-15 January 1993

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