The Nature of Unidentified Galactic High-Energy Gamma-Ray Sources, Softcover reprint of the original 1st ed. 2001 Proceedings of the Workshop held at Tonantzintla, Puebla, Mexico, 9-11 October 2000 Astrophysics and Space Science Library Series, Vol. 267

The Energetic Gamma-Ray Experiment Telescope (EGRET) instru­ ment on the Compton Gamma-Ray Observatory left as a legacy its Third Catalog of High Energy Gamma-Ray Sources, whose detections include a large number of blazars, some pulsars, the Large Magellanic Cloud and a solar flare. Most of the newly discovered objects - a majority of the catalog -are unidentified sources, with a clearly predominant Galactic population. Are all these radio-quiet pulsars, like Geminga, or is there a novel type of celestial object, awaiting identification? In spite of the limited angular resolution provided by EGRET and COMPTEL, there is still much to learn about unidentified ,-ray sources: correlation studies, multiwavelength observations and theoretical work can provide valuable clues, specially if these efforts are carried out in a coordinated manner. The aim of this workshop, held from October 9 to 11, 2000, at the Instituto N acional de Astrofisica, Optica y Electronica, at Tonantzintla, Mexico, was to gather experts on the subject, including observational as­ tronomers specialized in other regions of the electromagnetic spectrum, in an effort to address the question of the Nature of Galactic high-energy gamma-ray sources, both from the theoretical and observational perspec­ tive, and elaborate schemes for future identification studies which can make use of existing and forthcoming facilities.

I Unidentified Gamma-Ray Sources.- 1 Unidentified Gamma-Ray Sources: an Introduction.- 2 Gamma-Ray Properties of Unidentified EGRET Sources.- 3 Multiwavelength Searches and Spectral Aspects of 3EG Sources.- II Correlations Studies Of Unidentified Gamma-Ray Sources.- 4 Gamma-Ray Sources off the Galactic Plane.- 5 Low-Latitude Gamma-Ray Sources.- 6 Population Studies of Unidentified ?-Ray Sources.- 7 Population Studies of the EGRET Sources.- 8 Low-Latitude Gamma-Ray Sources and Supernova Remnants.- III High-energy Pulsars.- 9 Geminga Pulsars.- 10 X-Ray and Radio Observations of Bright GeV Sources.- 11 Gamma-Ray Pulsars: the ‘Outer Gap’ Perspective.- 12 Polar Cap Pulsar Models.- IV Supernova Remnants and Massive Stars.- 13 Massive Stars and Gamma-Ray Sources.- 14 Diffuse Sources of High-Energy Gamma Rays in the Milky Way.- 15 Shock Acceleration and Photon Production in Supernova Remnants.- 16 X-Ray Studies of Supernova Remnants.- V Galactic Microquasars Binaries Black Holes.- 17 Microquasars in the Galaxy.- 18 VLT Observations of Galactic Microquasars.- 19 The Case of LS 5039.- 20 Non-Pulsating Black Holes as High Energy Gamma-Ray Sources.- VI Identification and Perspectives.- 21 TeV Observations of Supernova Remnants and Unidentified Sources.- 22 A First EGRET-UNID-Related Agenda for Cherenkov Telescopes.- 23 ?-Ray Astronomy in the Era of GLAST.- 24 The AGILE Gamma-Ray Astronomy Satellite.- 25 Multiwavelength Round-Table Presentations.- VII Summary.- 26 Unidentified Gamma-Ray Sources- Summary and Conclusion.- Topic Index.- Author Index.