The Milky Way Galaxy: Proceedings Of The 106th Symposium Of The International Astronomical Union Held In Groningen, The Netherlands 30 May - 3 June, 1983 (international Astronomical Union Symposia)

In June 1983 the Astronomical Institute of the State University of Groningen, founded by Kapteyn about 100 years ago, celebrated its one-hundredth anniversary. At the suggestion of its Chairman, R.J. Allen, the Kapteyn Institute invited the International Astronomical Union to mark the centenary by holding a Symposium on "The Milky Way Galaxy". The purpose of the Symposium was to review recent progress in the study of our Galaxy, to define current problems, and to explore prospects for future development. The Symposium programme would emphasize the large-scale characteristics of our Galaxy, and highlight both the historical development of our understanding of the Milky Way Galaxy and the importance of studies of external galaxies to this understanding. The Symposium was sponsored by four IAU Commissions: 33 (Structure and Dynamics of the Galactic System), 28 (Galaxies), 34 (Interstellar Matter) and 41 (History of Astronomy). The Scientific Organizing Committee, listed on page xviii, represented a broad range of nationalities and of expertise, including two historians of science. A meeting of the Committee, held during the IAU General Assembly at Patras, provided an excellent opportunity to discuss plan and format of the Symposium, topics and speakers; thereafter, the-Committee was regularly consulted by letter and telephone. IAU Symposium 106 was held at Groningen on 30 May - 3 June 1983, in the new building occupied by the Kapteyn Institute since January 1983. There were about 200 participants, coming from as many as 25 countries. Front Matter....Pages i-xxiv Coloured Illustrations....Pages 1-8 Front Matter....Pages 9-10 The Milky Way from Antiquity to Modern Times....Pages 11-24 Kapteyn and Statistical Astronomy....Pages 25-42 Studies of the Milky Way 1850–1930: Some Highlights....Pages 43-58 The Discovery of the Spiral Arms of the Milky Way....Pages 59-70 Front Matter....Pages 71-74 Models of the Mass Distribution of the Galaxy....Pages 75-84 A Model of our Galaxy....Pages 85-94 Mass Models of Three Southern Late-Type Dwarf Spirals....Pages 95-96 The Galactic Constants╌An Interim Report....Pages 97-100 Galactic Rotation Outside the Solar Circle....Pages 101-104 Young Galactic Clusters and the Rotation Curve of our Galaxy....Pages 105-106 How Well Do We Know the Rotation Curve of Our Galaxy?....Pages 107-108 Galactic Rotation and Velocity Fields....Pages 109-110 The Old Population....Pages 113-122 Near-Infrared Studies of the Milky Way....Pages 123-126 Infrared Scanning of the Galactic Bulge....Pages 127-128 Infrared Studies of the Stellar Population in Baade’s Window....Pages 129-130 On the Nature of OH/IR Stars....Pages 131-132 The Stellar Disk Component: Distribution, Motions, Age and Stellar Composition....Pages 133-142 Computer-Based Catalogue of Open-Cluster Data....Pages 143-144 Front Matter....Pages 71-74 The Kinematics of Nearby Stars and Large-Scale Radial Motion in the Galaxy....Pages 145-148 The Galactic Radial Gradient of Velocity Dispersion....Pages 149-150 Stellar Chemical-Abundance Gradient in the Direction of the South Galactic Pole - Preliminary Results....Pages 151-152 Star Counts, Local Density and K Z Force....Pages 153-160 The Stellar Distribution in the Galactic Spheroid....Pages 161-162 Studies of O-F5 Stars at the Galactic Poles....Pages 163-164 Galaxy Population Structure from Proper Motions....Pages 165-166 Large-Scale Distribution and Motions of Gas....Pages 169-170 Survey of Galactic HI Emission At ∣b∣ ≤ 20°....Pages 171-172 The Vertical Distribution of Galactic HI: The Arecibo-Green Bank Survey....Pages 173-174 New Light on the Corrugation Phenomenon in our Galaxy....Pages 175-178 HI at the Outer Edge of the Galaxy and its Implications for Galactic Rotation....Pages 179-180 The Electron Density in the Plane of the Galaxy....Pages 181-182 Molecular Clouds in External Galaxies....Pages 183-192 Comments on the Distribution of Molecules in Spiral Galaxies....Pages 193-194 Distribution and Motions of Co in M51....Pages 195-196 CO (2−1) Observations of Maffei 2....Pages 197-198 CO Survey of the Southern Milky Way....Pages 199-202 Distribution of CO in the Southern Milky Way and Large-Scale Structure in the Galaxy....Pages 203-204 A CO(2−1) Survey of the Southern Milky Way....Pages 205-206 Front Matter....Pages 71-74 The Carbon Monoxide Distribution in the Inner Galaxy....Pages 207-208 Outer-Galaxy Molecular Clouds....Pages 209-210 CH in the Galaxy....Pages 211-212 High-Energy Gamma Rays and the Large-Scale Distribution of Gas and Cosmic Rays....Pages 213-218 Large-Scale Mapping of the Galaxy by IRAS....Pages 219-222 High-Energy Galactic Phenomena and the Interstellar Medium....Pages 225-234 The High-Latitude Distribution of Galactic Gamma Rays and Possible Evidence for a Gamma-Ray Halo....Pages 235-236 On the Ultraviolet Background Radiation of the Galaxy....Pages 237-238 Radio Continuum Emission of the Milky Way and Nearby Galaxies....Pages 239-244 Loop I (The North Polar Spur) Region — A Quasi Radio Halo....Pages 245-246 The Magnetic-Field Structure and Dynamics of NGC 253....Pages 247-248 Modelling the Galactic Contribution to the Faraday Rotation of Radiation from Extra-Galactic Sources....Pages 249-250 A Bisymmetric Spiral Magnetic Field in the Milky Way....Pages 251-252 Spiral Structure of the Milky Way and External Galaxies....Pages 255-272 Which Kind of Spiral Structure Can Fit the Observed Gradient of Vertex Deviation?....Pages 273-274 Spiral Structure and Kinematics of HI and HII in External Galaxies....Pages 275-280 A Systematic Study of M81....Pages 281-282 Determination of Galactic Spiral Structure at Radiofrequencies....Pages 283-300 Giant Clouds and Star-Forming Regions as Spiral-Arm Tracers....Pages 301-302 The Largest Molecular Complexes in the First Galactic Quadrant....Pages 303-304 Front Matter....Pages 71-74 Interpretation of the Apparent Anomalies of the Galactic Structure....Pages 305-308 Small-Scale Structure and Motions in the Interstellar Gas....Pages 311-318 Atomic Hydrogen Towards 3C10....Pages 319-320 Interferometric Observations of the Small-Scale Structure of Galactic Neutral Hydrogen....Pages 321-322 A 10-Ghz Radio-Continuum Survey of the Galactic-Plane Region at the Nobeyama Radio Observatory - A Complex Region at l = 22° – 25°....Pages 323-324 Interstellar Sodium and Galactic Structure. A High-Resolution Survey....Pages 325-328 Molecular-Cloud Clusters and Chains....Pages 329-330 Three Large Molecular Complexes in Norma....Pages 331-332 Comparison of CO in the Galaxy and the Magellanic Clouds....Pages 333-334 Star Formation in the Orion Arm....Pages 335-342 A Survey of Molecular Clouds Associated with Young Open Star Clusters....Pages 343-344 A New Study of the Neutral Hydrogen in Gould’s Belt....Pages 345-346 The Galactic Nucleus....Pages 349-366 Fine Structure of Molecular Clouds within 1 Minute of Arc of the Galactic Center....Pages 367-370 Recombination-Line Observations of the Galactic Centre....Pages 371-376 Are Spiral Nuclei “Active” in the Radio Continuum?....Pages 377-378 Phenomena at the Galactic Centre — A Massive Black Hole?....Pages 379-384 Highlights of High-Velocity Clouds....Pages 387-408 A Deep Survey for High-Velocity Clouds....Pages 409-410 A Survey for High-Velocity Clouds in the Inner Galaxy....Pages 411-412 Front Matter....Pages 71-74 Observations of High-Velocity Clouds Colliding in the Anticenter....Pages 413-414 The Milky Way: A Halo, a Corona, or Both?....Pages 415-420 A Comparison of the Andromeda and Milky Way Galaxies....Pages 423-430 Radial Distributions of Constituents in M33, the Galaxy, and M51....Pages 431-434 A Coordinated Radio and Optical Survey of M31....Pages 435-436 Distribution and Motions of HI in M31....Pages 437-442 The Production of a 16-Mm Film of M31....Pages 443-444 Distribution and Motion of CO in M31....Pages 445-450 Large-Scale Maps of M31 at Middle and Far Infrared Wavelengths....Pages 451-456 Front Matter....Pages 457-460 Slippery Evidence on Masses in the Local Group....Pages 461-470 A Collision between the Large and Small Magellanic Clouds 2×10 8 Years Ago....Pages 471-476 Tidal Interactions Between the Galaxy and the Magellanic Clouds....Pages 477-478 Dynamical Evolution of the Galactic Disk....Pages 481-490 Evolution of the Vertical Structure of Galactic Disks....Pages 491-492 Heating of Stellar Disks by Massive Gas Clouds....Pages 493-496 Stellar Velocity Distribution in the Presence of Scattering Massive Clouds....Pages 497-498 Warps and Heavy Halos....Pages 499-502 3-Dimensional Particle Simulation of Vertical Oscillations in Gas Discs....Pages 503-504 Two-Fluid Gravitational Instabilities in a Galactic Disk....Pages 505-508 Collective Phenomena in a Multi-Component Gravitating System....Pages 509-510 Front Matter....Pages 457-460 Formation and Maintenance of Spiral Structure in Galaxies....Pages 513-532 Two-Dimensional Calculations of Tightly Wound Spiral Shocks....Pages 533-534 Oscillations of Rotating Gas Disks: p -Modes, g -Modes, and r -Modes....Pages 535-536 The Stabilizing Effects of Haloes and Spiral Structure....Pages 537-538 New N-Body Experiments on the Spiral Structure of Galaxies....Pages 539-540 Velocity Dispersion and the Stability of Galactic Disks....Pages 541-542 Periodic Orbits Relevant for the Formation of Inner Rings in Barred Galaxies....Pages 543-544 On the 3-Kpc Arm: Waves Excited at the Resonance by an Oval Distortion in the Central Region....Pages 545-546 A Barred Galaxy: The Inside Viewpoint....Pages 547-549 Stochastic Star Formation and Spiral Structure....Pages 551-558 Spiral Structure in Galaxies: Large-Scale Stochastic Self-Organization of Interstellar Matter and Young Stars....Pages 559-560 Star Formation in Molecular Clouds....Pages 561-566 Star Formation in a Density-Wave-Dominated, Cloudy Interstellar Medium....Pages 567-570 Spiral Tracers and Prestellar Incubation Periods in a Cloudy Interstellar Medium....Pages 571-572 Chemical Composition of Interstellar Material....Pages 575-584 Interstellar Nitrogen Isotope Ratios....Pages 585-586 The Chemical Evolution of the Galaxy....Pages 587-596 Kinematical and Chemical Evolution of the Galactic Disk....Pages 597-600 The Formation and Early Evolution of the Milky Way....Pages 603-610 Supposed History of our Galaxy....Pages 611-612 Front Matter....Pages 457-460 Secular Evolution in Galaxies....Pages 613-614 Gas Dynamics and Disk-Galaxy Evolution....Pages 615-620 Front Matter....Pages 621-622 Life in the Galaxy?....Pages 623-632 Front Matter....Pages 633-634 The Milky Way: Summary and Outlook....Pages 635-640 Back Matter....Pages 641-660 Proceedings of the 106th Symposium of the International Astronomical Union held in Groningen, The Netherlands, May 30-June 3, 1983