**** ABSTRACT SUBMISSION DEADLINE 15 MAY **** Submissions should be made via the IAU website (please also email a copy to Anil Pradhan, Chair, SOC, at email@example.com).
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JD17 will take place on July 22, and the Panel Discussion on Atomic Data and Databases will be held on July 23, 9-10:30, jointly with Commission 14 (C14) - (Note different location)
Atomic data are crucial to the analysis of X-ray observations. Space observatories, the X-Ray Multi-Mirror Mission (XMM-Newton) and the Chandra X-ray Observatory (CXO), complemented by others such as BeppoSaX and the Rossi X-ray Timing Explorer (RXTE), are providing not only an astonishing wealth of spectroscopic data of a variety of astronomical sources, but also reveal tantalizing features of heretofore unobserved astrophysical phenomena.
Among the types of objects being studied are Stellar coronae, winds, and flares, Supernovae, Active Galactic Nuclei, X-ray binaries, and Gamma-ray bursters. The unprecedented spectral resolution of the new instruments reveals immense complexity representative of the emitting regions in these objects, from relatively well understood coronae of stars to the largely unknown physics of accretion discs of massive black holes thought to be the central engines of AGN. Answers to fundamental questions related to general relativity and atomic plasmas under extreme conditions, such as in the vicinity of black holes, possibly lie buried in the vast amount of X-ray spectroscopic data now being accumulated.
X-ray spectra of these diverse objects and the enormous range of conditions within them have made it abundantly clear that atomic physics plays a vital role, not only in spectral formation generally, but especially in specific wavelength regions that display anomalous features requiring careful interpretation. It is essential to disentangle atomic processes, plasma effects, and physical phenomena such as relativistic red-shifts and geometry. Accurate and extensive atomic data are the key to eliminating the uncertainties in astrophysical models, thereby allowing the real nature of observed sources to be determined.
As the X-ray spectroscopic observations and data analysis progress from discovery to diagnostics, astronomers are discovering that the available fundamental laboratory data do not match the task at hand. This situation is in spite of, not due to lack of, considerable recent progress in atomic theory, experiments, and astrophysical modeling. Large-scale calculations of accurate atomic data are now being carried out by groups of international collaborators; elaborate experiments using electron beam ion traps (EBIT) and synchroton ion storage rings are capable of detailed studies of excitation processes underlying X-ray emission; numerical simulations of plasma enviroments with new codes and data are becoming increasingly extensive and precise in the description of astrophysical sources.
The aim of this Joint Discussion is to bring together these distinct, but intimately related, components of X-ray astronomy -- astronomical X-ray observers and modellers, and experimental and theoretical atomic physicists -- with the goal of discussing atomic data needs and availablity.
Chandra observations of the Seyfert 1 active galactic nucleus of MCG-6-30-15 (Lee etal. 2001)
XMM-Newton spectrum of the active Seyfert 2 galaxy NGC 1068 (Kinkhabwala et al. 2002)
K-alpha resonances in X-ray absorption by Oxygen ions (Pradhan,Chen,Delahaye,Nahar,Oelgoetz 2002)
A number of major experimental programs are under way in X-ray laboratory astrophysics: electron-beam-ion-traps, synchrotron ion storage rings, tokamaks, and magnetic Z-pinch devices. These are capable of very high-resolution measurements of cross sections to calibrate theoretical calculations, and diagnostic line ratios for comparison with models. Furthermore, spectral observations over extended wavelength ranges of several ionization states of different elements may be observed under controlled laboratory conditions. The JD would highlight the state-of-the-art in experimental atomic physics of X-ray spectroscopy.
LLNL EBIT measured cross sections and comparison with theory (courtesy, P. Beiersdorfer)
SAO-NIST EBIT measured x-ray spectrum (courtesy, E. Silver)
(Merged-beams recombination rate coeffcient of Li-like Ni25+ measured at the heavy-ion storage ring TSR of the Max-Planck-Institute for Nuclear Physics in Heidelberg, Schippers et al., Phys. Rev. A 62, 022708 (2002).)
The JD will comprise of 2 half-day sessions, divided into 4 parts covering (I) New X-Ray Observations, (II) Atomic Theory, (III) Laboratory Measurements, and (IV) Plasma Modeling and Atomic Databases. Each part will consist of three 30-minute revies talks and a few other oral presentations. Interposed between the two sessions will be a poster session for contributed papers. The JD will include presentations from various databases and a Panel Discussion on July 23 or 24.
This JD is the only meeting at the IAU General Assembly dedicated to X-ray Astronomy, and the SOC welcomes poster contributions on all aspects thereof.
There will be a book of Proceedings for participants, in the IAU Highlights of Astronomy series to submit articles based on their presentations and related material.
N. Brickhouse (USA), H. Hasan (USA), J. Houck (USA), A. Fabian (UK), J. Kaastra (Netherlands), F. Keenan (UK), S. Kahn (USA), T. Kallman (USA), H. Netzer (Israel), A.K. Pradhan (USA, Chair), P.L. Smith (USA), K.Yamashita (Japan).
Ehud Behar (Israel), Peter Beiersdorfer (USA), Nancy Brickhouse (USA), Andy Fabian (UK), Rajmal Jain (India), Jelle Kaastra (Netherlands), Steve Kahn (USA), Tim Kallman (USA), Enrico Landi (Italy), Julia Lee (USA), Duane Liedahl (USA), Brendan McLaughlin (UK), Patrick Palmeri (France), Izumi Murakami (Japan), Anil Pradhan (USA), Stefan Schippers (Germany), Eric Silver (USA), Bill Martin (USA)
Bob Williams, Hagai Netzer, Peter Smith, Ken Pounds, Mike Dopita
ABSTRACTS FOR CONTRIBUTED PRESENTATIONS TO JD17 MAY BE SUBMITTED AT: ABSTRACT SUBMISSION
Please consult the IAU website at: www.iau.org, or XXVth IAU GENERAL ASSEMBLY for more information on the site.
Site and Travel:
The JD will take place all day Tuesday July 22, with a Panel Discussion on July 23 or 24, during the General Assembly to be held in the Convention and Exhibition Centre at Darling Harbour, Sydney. A number of other Joint Discussions and Symposia are being organised all throughout the two-week duration of the GA.
Limited funds from the IAU are available to assist with travel costs for participants without much other support. However, these grants are generally small and cover only a small fraction of the total cost. The application forms are available from the IAU website.
Abstract Submission Deadline 1 March 2003 (Post-deadline abstracts can be accepted)
Applications for IAU Travel Grants: 15th February 2003
Abstract deadline: 15th February 2003
Successful Travel Grant applicants notified: 15th March 2003
Early Registration deadline: 30th April 2003
Revised: 2002 November 26