Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-03-27
Astronomy and Astrophysics
Astrophysics
11 pages + 5 Postscript figures
Scientific paper
10.1086/310061
The TGRS (Transient Gamma-Ray Spectrometer) experiment is a high-resolution germanium detector launched on the WIND satellite on Nov. 1, 1994. Although primarily intended to study gamma-ray bursts and solar flares, TGRS also has the capability of studying slower transients (e.g. x-ray novae) and certain steady sources. We present here results on the narrow 511 keV annihilation line from the general direction of the Galactic Center accumulated over the period Jan. 1995 through Oct. 1995. These results were obtained from the TGRS occultation mode, in which a lead absorber occults the Galactic Center region for 1/4 of each spacecraft rotation, thus chopping the 511 keV signal. The occulted region is a band in the sky of width 16 degrees that passes through the Galactic Center. We detect the narrow annihilation line from the galactic center with flux = $(1.64\pm0.09)\times10^{-3} {photons} {cm}^{-2} {s}^{-1}$. The data are consistent with a single point source at the galactic center, but a distributed source of extent up to ~30 degrees cannot be ruled out. No evidence for temporal variability on time scales longer than 1 month was found.
Cline Thomas L.
Gehrels Neil
Hurley K. H.
Landis Don A.
Madden Norman W.
No associations
LandOfFree
TGRS Observation of the Galactic Center Annihilation Line does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with TGRS Observation of the Galactic Center Annihilation Line, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and TGRS Observation of the Galactic Center Annihilation Line will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-697117