GC98 Proceedings - GCNEWS, Vol. 10, December 1999

GCNEWS

A Newsletter for Galactic Center Research
This Volume was edited by Angela Cotera & Heino Falcke
email: gcnews@aoc.nrao.edu

Volume 10, December 1999 - GC98 Proceedings

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GC98 Workshop Proceedings: Table of Contents

The proceedings of last year's Galactic Center workshop have appeared. If you are a participant and have not received a copy you should complain to us. If you are not a participant and still hesitate to buy a copy we list the table of contents in the following. The reference for the book is

"The Central Parsecs of the Galaxy", eds. H. Falcke, A. Cotera, W. Duschl, F. Melia, M. Rieke, ASP Conf. Series, Vol. 186

Session I: What is the Central Matter Distribution?

The Galactic Center Black Hole
  R. Genzel and A. Eckart 3
High Proper Motion Stars in the Vicinity of Sgr A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy
  A. M. Ghez, M. Morris and E. E. Becklin 18
The Proper Motion and Mass of Sgr A*
  M. J. Reid, A. C. S. Readhead, R. C. Vermeulen and R. N. Treuhaft 24
NICMOS Search for the Tip of the Main Sequence
  M. J. Rieke 32
NICMOS Observations of the Central Parsec: Deep Imaging at 1.6 microns, Short-Term Variability, and Ionized Emission
  S. R. Stolovy, D. W. McCarthy, F. Melia, G. Rieke, M. J. Rieke and F. Yusef-Zadeh 39
Discussion Session I: What is the Central Matter Distribution?
  E. E. Becklin and A. Cotera 49
Session II: Can VLBI Constrain the Size and Structure of Sgr A*?

Sgr A* -- Propagation Effects, Variability and VLA Proper Motion
  D. C. Backer and R. S. Sramek 67
Intrinsic Size and Shape of Sgr A*: 3.6 AU by <1 AU
  K. Y. Lo, Z.-Q. Shen, J.-H. Zhao and P. T. P. Ho 72
VLBA Imaging at 7 mm and Linear Polarimetric Observations at 6 cm and 3 mm of Sgr A*
  G. C. Bower, H. Falcke, D. C. Backer and M. Wright 80
VLBI Observations of the Galactic Center Source Sgr A* at 86 GHz and 215 GHz
  T. P. Krichbaum, A. Witzel and J. A. Zensus 89
Structure of Sgr A* from 3mm-VLBI
  S. Doeleman, A. E. E. Rogers, D. C. Backer, M. Wright and G. C. Bower 98
Flare of Sgr A* at Short Millimeter Wavelengths
  M. Tsuboi, A. Miyazaki and T. Tsutsumi 105
Radio Variability of Sgr A* at Centimeter Wavelengths
  H. Falcke 113
Discussion Session II: Can VLBI Constrain the Size and Structure of Sgr A*?
  J. A. Zensus and H. Falcke 118
Session III: How to Reconcile Models and Observations of Sgr A*?

The Nature of Sgr A* -- An Introduction
  F. Melia 127
Advection-Dominated Accretion in the Galactic Center and the Appearance of Sgr A*
  T. Beckert and W. J. Duschl 138
The Jet Model for Sgr A*
  H. Falcke 148
Accretion Disk Instabilities in the Vicinity of Black Holes
  R. Auer and W. J. Duschl 157
Disks with Jet, ADAF, or EDAF for Sgr A*
  A. C. Donea, H. Falcke and P. L. Biermann 162
Acceleration Processes Towards a Quasi-Monoenergetic Electron Distribution
  Z. Jauch and W. J. Duschl 169
Discussion Session III: How to Reconcile Models and Observations of Sgr A*?
  R. Genzel and H. Falcke 175
Session IV: How are the VariousComponents of Sgr A West Related?

The Interaction of Two Prominent Galactic Center Sources: Sgr A East and the Molecular Ring
  F. Yusef-Zadeh, S. R. Stolovy, M. Burton, M. Wardle, F. Melia, T. J. W. Lazio, N. E. Kassim and D. A. Roberts 197
3D Simulation of the Gas Dynamics in the Central Parsec of the Galaxy
  R. F. Coker and F. Melia 214
Proper Motions and Structure of the Radio Components Near Sgr A*: Evidence for Ionized Gas Falling Into the Massive Black Hole at the Galactic Center
  J.-H. Zhao and W. M. Goss 224
Sgr A* in the Mid-Infrared Reference Frame: The Relationship Between the Radio and Infrared Sources in the Central Parsec
  D. Gezari 234
Mid-Infrared Imaging of the Central Parsec with Keck
  A. Cotera, M. Morris, A. M. Ghez, E. E. Becklin, A. M. Tanner, M. W. Werner and S. R. Stolovy 240
The Circumnuclear Disk and Ionized Gas Filaments as Remnants of Tidally Disrupted Clouds
  R. H. Sanders 250
A Gas Streamer Feeding the Circumnuclear Disk
  A. L. Coil and P. T. P. Ho 260
The Minispiral in the Galactic Center -- Exploring a Data Cube With a Three Dimensional Method
  B. Vollmer and W. J. Duschl 265
Discussion Session IV: Morphology and Gas Dynamics Within Sgr A West: How are the Various Components of Sgr A West Related?
  P. G. Mezger and A. Cotera 275
Session V: How, When, Where and Why are Stars Formed in the Galactic Center?

The Stellar Content of the Galactic Center
  R. D. Blum, S. V. Ramirez and K. Sellgren 291
A Complete K-band Luminosity Function of the Central 30 pc
  S. Philipp, P. G. Mezger and R. Zylka 300
Properties of Stars in the Galactic Center
  T. Ott, A. Eckart and R. Genzel 310
Massive Young Stars in the Arches Cluster
  E. Serabyn, D. Shupe and D. F. Figer 320
HST/NICMOS Imaging of the Quintuplet and Arches Clusters
  D. F. Figer, M. Morris, S. S. Kim and E. Serabyn 329
Theoretical Modelling of Hot Stars
  F. Najarro, D. J. Hillier, D. F. Figer and T. R. Geballe 340
Spatially Resolved Dust Shells in the Central Parsec
  A. M. Tanner, A. M. Ghez, M. Morris and E. E. Becklin 351
Discussion Session V: How, When, Where and Why are Stars Formed in the Galactic Center?
  K. Sellgren and A. Cotera 358
Session VI: What is the Metallicity as Determined from Old and New Stars?

Stellar Abundances at the Galactic Center
  S. V. Ramirez, K. Sellgren, D. M. Terndrup, J. S. Carr, S. Balachandran and R. D. Blum 373
OH/IR Stars as Signposts for Ancient Starburst Activity in the Galactic Center
  L. O. Sjouwerman, H. J. Habing, M. Lindqvist, H. J. van Langevelde and A. Winnberg 379
Physical Properties of OH/IR Stars Close to the Galactic Center
  A. Winnberg, M. Lindqvist and H. J. Habing 389
Discussion Session VI: What is the Metallicity as Determined from Old and New Stars?
  W. J. Duschl, R. F. Coker and A. Cotera 394
Session VII: How Do the Various Components of the Inner 100 Parsecs Interact With Each Other?

Wide Field Radio Imaging of the Galactic Center
  N. E. Kassim, T. N. LaRosa, T. J. W. Lazio and S. D. Hyman 403
Sgr A East and its Interaction With Surrounding Gas
  R. Zylka, R. Güsten, S. Philipp, H. Ungerechts, P. G. Mezger and W. J. Duschl 415
Ionized Gas in the Sgr A Complex -- VLA Observations of H168-alpha and H270-alpha Recombination Lines
  K. R. Anantharamaiah, A. Pedlar and W. M. Goss 422
OH(1720 MHz) Masers at the Galactic Center
  M. Wardle, F. Yusef-Zadeh and T. R. Geballe 432
Hyperstrong Radio-Wave Scattering and Free Electrons in the Galactic Center
  T. J. W. Lazio, J. M. Cordes, K. R. Anantharamaiah, W. M. Goss and N. E. Kassim 441
SHARC 350 micron Mapping of the Galactic Center from the Caltech Submillimeter Observatory
  C. D. Dowell, D. C. Lis, E. Serabyn, M. Gardner, A. Kovacs and S. Yamashita 453
Discussion Session VII: How Do the Various Components of the Inner 100 Parsecs Interact With Each Other?
  W. M. Goss, R. F. Coker and A. Cotera 465
Session VIII: What is the Strength and Influence of the Magnetic Field in the Galactic Center?

Magnetic Fields in the Galactic Center
  D. A. Roberts 483
Far-infrared/Submillimeter Polarimetric Observations of the Galactic Center
  G. Novak 488
Radio Polarmetric Studies of the Galactic Center Threads
  C. C. Lang 498
Discovery of a New Filamentary Structure G358.85+0.47 -- The Pelican
  K. R. Anantharamaiah, C. C. Lang, N. E. Kassim, T. J. W. Lazio and W. M. Goss 507
The Age of the Galactic Center Arc Determined by its mm-Wave Spectral Cut-Off
  Y. Sofue, W. Reich, P. Reich and R. Wielebinski 514
Discussion Session VIII: The Magnetic Field in the Galactic Center
  Y. Sofue and C. C. Lang 519
Session IX: What Would the Galactic Center Look Like from 1 Mpc?

The Mid-Infrared Spectrum of the Galactic Center -- a Starburst Nucleus
  J. P. Simpson, F. C. Witteborn, M. Cohen and S. D. Price 527
Discussion Session IX: How ``Standard'' is the Central Region of Our Galaxy? What Would the GC Look Like from One Mpc Distance?
  H. Falcke, S. Kern and A. Cotera 536
Session X: What Can We Learn from High-Energy Emission in the Galactic Center?

Cosmic Rays in the Galactic Center Region
  W. Rhode, T. A. En&ssharp;lin and P. L. Biermann 543
Gamma-Rays from the Galactic Center: A Point-Like or Diffuse Source?
  S. Markoff and F. Melia 551
The Galactic Center EGRET Source and the Broad-band Spectrum of Sgr A East
  M. Fatuzzo, F. Melia, F. Yusef-Zadeh and S. Markoff 560
Cold Matter in the Galactic Center Region Measured with the X-ray Satellite ASCA
  M. Sakano, M. Nishiuchi, K. Koyama, J. Yokogawa and Y. Maeda 569
ASCA Observations of the Sgr A Region
  Y. Maeda, K. Koyama, H. Murakami and M. Sakano 578
Is the Sgr B2 Cloud an X-ray Reflection Nebula?
  H. Murakami, K. Koyama, M. Sakano, M. Tsujimoto and Y. Maeda 586
Discussion Session X: What Can We Learn from High-Energy Emission in the Galactic Center?
  F. Melia and S. Markoff 597
Summary

Conference Summary: The Central Parsecs
  C. H. Townes, S. R. Stolovy and H. Falcke 611

Session I: What is the Central Matter Distribution?
The Galactic Center Black Hole R. Genzel and A. Eckart	3
*High Proper Motion Stars in the Vicinity of Sgr A: Evidence for a Supermassive Black Hole at the Center of Our Galaxy** A. M. Ghez, M. Morris and E. E. Becklin	18
The Proper Motion and Mass of Sgr A* M. J. Reid, A. C. S. Readhead, R. C. Vermeulen and R. N. Treuhaft	24
NICMOS Search for the Tip of the Main Sequence M. J. Rieke	32
NICMOS Observations of the Central Parsec: Deep Imaging at 1.6 microns, Short-Term Variability, and Ionized Emission S. R. Stolovy, D. W. McCarthy, F. Melia, G. Rieke, M. J. Rieke and F. Yusef-Zadeh	39
Discussion Session I: What is the Central Matter Distribution? E. E. Becklin and A. Cotera	49
Session II: Can VLBI Constrain the Size and Structure of Sgr A*?
*Sgr A -- Propagation Effects, Variability and VLA Proper Motion** D. C. Backer and R. S. Sramek	67
*Intrinsic Size and Shape of Sgr A: 3.6 AU by <1 AU** K. Y. Lo, Z.-Q. Shen, J.-H. Zhao and P. T. P. Ho	72
VLBA Imaging at 7 mm and Linear Polarimetric Observations at 6 cm and 3 mm of Sgr A* G. C. Bower, H. Falcke, D. C. Backer and M. Wright	80
*VLBI Observations of the Galactic Center Source Sgr A at 86 GHz and 215 GHz** T. P. Krichbaum, A. Witzel and J. A. Zensus	89
*Structure of Sgr A from 3mm-VLBI** S. Doeleman, A. E. E. Rogers, D. C. Backer, M. Wright and G. C. Bower	98
*Flare of Sgr A at Short Millimeter Wavelengths** M. Tsuboi, A. Miyazaki and T. Tsutsumi	105
*Radio Variability of Sgr A at Centimeter Wavelengths** H. Falcke	113
*Discussion Session II: Can VLBI Constrain the Size and Structure of Sgr A?** J. A. Zensus and H. Falcke	118
Session III: How to Reconcile Models and Observations of Sgr A*?
*The Nature of Sgr A -- An Introduction** F. Melia	127
Advection-Dominated Accretion in the Galactic Center and the Appearance of Sgr A* T. Beckert and W. J. Duschl	138
The Jet Model for Sgr A* H. Falcke	148
Accretion Disk Instabilities in the Vicinity of Black Holes R. Auer and W. J. Duschl	157
Disks with Jet, ADAF, or EDAF for Sgr A* A. C. Donea, H. Falcke and P. L. Biermann	162
Acceleration Processes Towards a Quasi-Monoenergetic Electron Distribution Z. Jauch and W. J. Duschl	169
*Discussion Session III: How to Reconcile Models and Observations of Sgr A?** R. Genzel and H. Falcke	175
Session IV: How are the VariousComponents of Sgr A West Related?
The Interaction of Two Prominent Galactic Center Sources: Sgr A East and the Molecular Ring F. Yusef-Zadeh, S. R. Stolovy, M. Burton, M. Wardle, F. Melia, T. J. W. Lazio, N. E. Kassim and D. A. Roberts	197
3D Simulation of the Gas Dynamics in the Central Parsec of the Galaxy R. F. Coker and F. Melia	214
*Proper Motions and Structure of the Radio Components Near Sgr A: Evidence for Ionized Gas Falling Into the Massive Black Hole at the Galactic Center** J.-H. Zhao and W. M. Goss	224
*Sgr A in the Mid-Infrared Reference Frame: The Relationship Between the Radio and Infrared Sources in the Central Parsec** D. Gezari	234
Mid-Infrared Imaging of the Central Parsec with Keck A. Cotera, M. Morris, A. M. Ghez, E. E. Becklin, A. M. Tanner, M. W. Werner and S. R. Stolovy	240
The Circumnuclear Disk and Ionized Gas Filaments as Remnants of Tidally Disrupted Clouds R. H. Sanders	250
A Gas Streamer Feeding the Circumnuclear Disk A. L. Coil and P. T. P. Ho	260
The Minispiral in the Galactic Center -- Exploring a Data Cube With a Three Dimensional Method B. Vollmer and W. J. Duschl	265
Discussion Session IV: Morphology and Gas Dynamics Within Sgr A West: How are the Various Components of Sgr A West Related? P. G. Mezger and A. Cotera	275
Session V: How, When, Where and Why are Stars Formed in the Galactic Center?
The Stellar Content of the Galactic Center R. D. Blum, S. V. Ramirez and K. Sellgren	291
A Complete K-band Luminosity Function of the Central 30 pc S. Philipp, P. G. Mezger and R. Zylka	300
Properties of Stars in the Galactic Center T. Ott, A. Eckart and R. Genzel	310
Massive Young Stars in the Arches Cluster E. Serabyn, D. Shupe and D. F. Figer	320
HST/NICMOS Imaging of the Quintuplet and Arches Clusters D. F. Figer, M. Morris, S. S. Kim and E. Serabyn	329
Theoretical Modelling of Hot Stars F. Najarro, D. J. Hillier, D. F. Figer and T. R. Geballe	340
Spatially Resolved Dust Shells in the Central Parsec A. M. Tanner, A. M. Ghez, M. Morris and E. E. Becklin	351
Discussion Session V: How, When, Where and Why are Stars Formed in the Galactic Center? K. Sellgren and A. Cotera	358
Session VI: What is the Metallicity as Determined from Old and New Stars?
Stellar Abundances at the Galactic Center S. V. Ramirez, K. Sellgren, D. M. Terndrup, J. S. Carr, S. Balachandran and R. D. Blum	373
OH/IR Stars as Signposts for Ancient Starburst Activity in the Galactic Center L. O. Sjouwerman, H. J. Habing, M. Lindqvist, H. J. van Langevelde and A. Winnberg	379
Physical Properties of OH/IR Stars Close to the Galactic Center A. Winnberg, M. Lindqvist and H. J. Habing	389
Discussion Session VI: What is the Metallicity as Determined from Old and New Stars? W. J. Duschl, R. F. Coker and A. Cotera	394
Session VII: How Do the Various Components of the Inner 100 Parsecs Interact With Each Other?
Wide Field Radio Imaging of the Galactic Center N. E. Kassim, T. N. LaRosa, T. J. W. Lazio and S. D. Hyman	403
Sgr A East and its Interaction With Surrounding Gas R. Zylka, R. Güsten, S. Philipp, H. Ungerechts, P. G. Mezger and W. J. Duschl	415
Ionized Gas in the Sgr A Complex -- VLA Observations of H168-alpha and H270-alpha Recombination Lines K. R. Anantharamaiah, A. Pedlar and W. M. Goss	422
OH(1720 MHz) Masers at the Galactic Center M. Wardle, F. Yusef-Zadeh and T. R. Geballe	432
Hyperstrong Radio-Wave Scattering and Free Electrons in the Galactic Center T. J. W. Lazio, J. M. Cordes, K. R. Anantharamaiah, W. M. Goss and N. E. Kassim	441
SHARC 350 micron Mapping of the Galactic Center from the Caltech Submillimeter Observatory C. D. Dowell, D. C. Lis, E. Serabyn, M. Gardner, A. Kovacs and S. Yamashita	453
Discussion Session VII: How Do the Various Components of the Inner 100 Parsecs Interact With Each Other? W. M. Goss, R. F. Coker and A. Cotera	465
Session VIII: What is the Strength and Influence of the Magnetic Field in the Galactic Center?
Magnetic Fields in the Galactic Center D. A. Roberts	483
Far-infrared/Submillimeter Polarimetric Observations of the Galactic Center G. Novak	488
Radio Polarmetric Studies of the Galactic Center Threads C. C. Lang	498
Discovery of a New Filamentary Structure G358.85+0.47 -- The Pelican K. R. Anantharamaiah, C. C. Lang, N. E. Kassim, T. J. W. Lazio and W. M. Goss	507
The Age of the Galactic Center Arc Determined by its mm-Wave Spectral Cut-Off Y. Sofue, W. Reich, P. Reich and R. Wielebinski	514
Discussion Session VIII: The Magnetic Field in the Galactic Center Y. Sofue and C. C. Lang	519
Session IX: What Would the Galactic Center Look Like from 1 Mpc?
The Mid-Infrared Spectrum of the Galactic Center -- a Starburst Nucleus J. P. Simpson, F. C. Witteborn, M. Cohen and S. D. Price	527
Discussion Session IX: How ``Standard'' is the Central Region of Our Galaxy? What Would the GC Look Like from One Mpc Distance? H. Falcke, S. Kern and A. Cotera	536
Session X: What Can We Learn from High-Energy Emission in the Galactic Center?
Cosmic Rays in the Galactic Center Region W. Rhode, T. A. En&ssharp;lin and P. L. Biermann	543
Gamma-Rays from the Galactic Center: A Point-Like or Diffuse Source? S. Markoff and F. Melia	551
The Galactic Center EGRET Source and the Broad-band Spectrum of Sgr A East M. Fatuzzo, F. Melia, F. Yusef-Zadeh and S. Markoff	560
Cold Matter in the Galactic Center Region Measured with the X-ray Satellite ASCA M. Sakano, M. Nishiuchi, K. Koyama, J. Yokogawa and Y. Maeda	569
ASCA Observations of the Sgr A Region Y. Maeda, K. Koyama, H. Murakami and M. Sakano	578
Is the Sgr B2 Cloud an X-ray Reflection Nebula? H. Murakami, K. Koyama, M. Sakano, M. Tsujimoto and Y. Maeda	586
Discussion Session X: What Can We Learn from High-Energy Emission in the Galactic Center? F. Melia and S. Markoff	597
Summary
Conference Summary: The Central Parsecs C. H. Townes, S. R. Stolovy and H. Falcke	611

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Credits:

Editors of this Volume: Angela Cotera & Heino Falcke
The GCNEWS Logo at the top of this page shows a 20cm radio map of the GC (Sgr A) made by Yusef-Zadeh & Morris.
The GCNEWS newsletters, newsflashes and web pages are based on scripts originally developed by Heino Falcke.
Internet access for GCNEWS is currently sponsored by the National Radio Astronomy Observatory in Socorro NM/USA.

Page currently maintained by L. O. Sjouwerman. File last modified on Monday 04 August 2003 [09:57 MDT].

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