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Title:
COMPTEL gamma -ray study of the Crab nebula
Authors:
van der Meulen, R. D.; Bloemen, H.; Bennett, K.; Hermsen, W.; Kuiper, L.; Much, R. P.; Ryan, J.; Schonfelder, V.; Strong, A.
Affiliation:
AA(SRON-Utrecht, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands; Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands), AB(SRON-Utrecht, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands; Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands), AC(Astrophysics Division, ESTEC, 2200 AG Noordwijk, The Netherlands), AD(SRON-Utrecht, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands), AE(SRON-Utrecht, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands), AF(Astrophysics Division, ESTEC, 2200 AG Noordwijk, The Netherlands), AG(Space Science Center, University of New Hampshire, Durham, NH 03824, USA), AH(Max-Planck-Institut fur Extraterrestrische Physik, P.O. Box 1603, D-85740 Garching, Germany), AI(Max-Planck-Institut fur Extraterrestrische Physik, P.O. Box 1603, D-85740 Garching, Germany)
Publication:
Astronomy and Astrophysics, v.330, p.321-326 (1998) (A&A Homepage)
Publication Date:
02/1998
Origin:
A&A
A&A Keywords:
ISM: CRAB NEBULA, COSMIC RAYS, ISM: SUPERNOVA REMNANTS, GAMMA-RAYS: OBSERVATIONS
Bibliographic Code:
1998A&A...330..321V

Abstract

We report on a study of the gamma -ray continuum emission from the Crab supernova nebula and on a search for nuclear de-excitation gamma -ray lines. Crab is the brightest continuum source in the 1-10 MeV gamma -ray sky, and its continuum radiation is most likely of synchrotron origin. It is a likely source of cosmic rays through shock acceleration and thus a potential candidate for gamma -ray line emission from nuclear interactions. Five years of COMPTEL observations enable a fine spectral binning to investigate the behaviour of the 0.75-30 MeV emission in detail and to search for nuclear de-excitation lines on top of the continuum. The nebular spectrum shows a break at the edge of the COMPTEL energy range and connects well to the EGRET spectrum, probably reflecting electron energy losses in the synchrotron emission scenario. Such a smooth continuum model alone may not be sufficient to explain the observations. A weak bump in the spectrum at 1-2 MeV may be present. No significant evidence for distinct line emission is seen, but the presence of a blend of line features or another synchrotron component cannot be excluded.

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