Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy

By P. Jean, Jürgen Knödlseder, Vincent Lonjou, M. Allain, J. Roques, G. Skinner, B. Teegarden, G. Vedrenne, P. V. Ballmoos, B. Cordier and 11 more. 2003

238 citations recorded by the source corpus.

We report the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory). Taking into account the range of spatial distribution models which are consistent with the data, we derive a flux of 9:9 +4:7 2:1 10 4 ph cm 2 s 1 and an intrinsic line width of 2:95 +0:45 0:51 keV (FWHM). The results are consistent with other high-spectroscopy measurements, though the width is found to be at the upper bound of previously reported values.

Subfields: Aerospace Engineering, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e217559905aaf1d954be561a1b4f96da4b14a795

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. A. Strong
2. Igor V. Moskalenko
3. A. Marcowith
4. A. Bykov
5. R. Diehl
6. P. Jean
7. N. Guessoum
8. N. Prantzos

In Nuclear and High Energy Physics

1. A. Strong
2. Igor V. Moskalenko
3. A. Marcowith
4. A. Bykov
5. R. Diehl
6. P. Jean
7. N. Guessoum
8. Céline Boehm

Citations in the corpus

• Spectral analysis of the Galactic e+e- annihilation emission (2005, unknown): “Using preliminary SPI data of Jean et al. (2003) and TGRS data of Harris et al. (1998), Guessoum et al. (2004) showed that the bulk of the annihilation occurs in warm gas.”
• The all-sky distribution of 511 keV electron-positron annihilation emission (2005, methodology): “The analysis confirms our earlier findings (Jean et al. 2003a; Knödlseder et al. 2004; Weidenspointner et al. 2004) of a compact and symmetric 511 keV line emission distribution towards the galactic centre.”
• Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL (2004, methodology): “Previously reported results on the 511 keV line shape (Jean et al. 2003) are based on significantly shorter data set.”
• Early SPI/INTEGRAL constraints on the morphology of the 511 keV line emission in the 4th galactic quadrant (2003, methodology): “Along with the model intensities, 19 background model scaling factors have been adjusted for the line component by the fit, one for each orbit (factors G in Jean et al. 2003); the scaling factors for the continuum component (factors F in Jean et al. 2003) have been fixed to unity.”
• The 511 keV emission from positron annihilation in the Galaxy (2010, methodology): “Using preliminary SPI data of Jean et al. (2003) and TGRS data of Harris et al. (1998), Guessoum et al. (2004) showed that the bulk of the annihilation occurs in warm gas.”