John Robinson: Two Addresses Delivered in the Pieterskerk in by Prof. Dr. A. Eekhof, Rev. Dr. Edgar F. Romig (auth.)

By Prof. Dr. A. Eekhof, Rev. Dr. Edgar F. Romig (auth.)

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Extra info for John Robinson: Two Addresses Delivered in the Pieterskerk in Leyden on the Occasion of the Unveiling of the Memorial-Tablet in the Baptismal Chapel, on Saturday September 8th 1928

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Rieke et al. (1988) proposed a significantly shorter duration (10 6 - 10 7 yr) for this phase of the nuclear starburst in NGC 253 from other reasons making the nuclear superwind origin of the halo emission questionable. Further indications that the ongoing nuclear starburst is not supporting the extended X-ray halo emission in NGC 253 can be drawn from the ROSAT HRI and the VLA radio observations. f. Fig. 3) and does not connect to the hot halo gas (observed in the ROSAT PSPC). Similarly, the radio spur and prominence starting in the north-east part of the NGC 253 disk argue for an origin of the halo gas from areas outside the nucleus (Carilli et al.

In this case. 75·10 MeV) (Bloemen el 01 .. 1993) observe in other parts of the Galaxy; as a rough estimate. this demands - 108 Mo or - 1000 clouds of the 'p Oph' type. if no cosmic ray anomalies are assumed. There is some indication of variability of this source. which would j 0 -10 11 favour the compact source interpretation. Further observations are beeing performed to put statistically significant constraints on the GC source variability on the timescale of weeks to months. 150 - 5. Summary 300 MeV Recent observational data from spacebom telescopes have the potential to provide a substantially more detailed of the picture Galactic Centre region in the light 160 140 120 IOU eo GO 4u 20 a )40 320 JOO 280 260 240 220 200 Ie of gamma-rays.

No. 330, pp. , and Lesch, H. 1992: 'Anatomy of the Sagittarius A complex', Astron. B Astrophys. Vol. no. 261, pp. H. Townes (left), P. Mezger (middle), and M. Morris (right) R. Hildebrand (left) and J. Storey (right) in front of Schlo6 Ringberg THE 511 keY LINE AND THE GREAT ANNIHILATOR M. LEVENTIIAL Department of Astronomy University of Maryland College Park, Maryland 20742 ABSTRACT. The history of Galactic Center 511 keY electron/positron line observations is reviewed with an emphasis on current observations.

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