Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-14
Astron.Astrophys. 422 (2004) L47-L50
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy & Astrophysics Letters
Scientific paper
10.1051/0004-6361:20040172
We present a solution to the apparent discrepancy between the radial gradient in the diffuse Galactic gamma-ray emissivity and the distribution of supernova remnants, believed to be the sources of cosmic rays. Recent determinations of the pulsar distribution have made the discrepancy even more apparent. The problem is shown to be plausibly solved by a variation in the CO-to-N(H2) scaling factor. If this factor increases by a factor of 5-10 from the inner to the outer Galaxy, as expected from the Galactic metallicity gradient, we show that the source distribution required to match the radial gradient of gamma-ray can be reconciled with the distribution of supernova remnants as traced by current studies of pulsars. The resulting model fits the EGRET gamma-ray profiles extremely well in longitude, and reproduces the mid-latitude inner Galaxy intensities better than previous models.
Diehl Roland
Digel Seth
Moskalenko Igor V.
Reimer Olaf
Strong Andrew W.
No associations
LandOfFree
The distribution of cosmic-ray sources in the Galaxy, gamma-rays, and the gradient in the CO-to-H2 relation 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 The distribution of cosmic-ray sources in the Galaxy, gamma-rays, and the gradient in the CO-to-H2 relation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The distribution of cosmic-ray sources in the Galaxy, gamma-rays, and the gradient in the CO-to-H2 relation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-671048