Molecular Clouds as Cosmic-Ray Barometers

Details Molecular Clouds as Cosmic-Ray Barometers Molecular Clouds as Cosmic-Ray Barometers

2009-04-20

arxiv.org/abs/0904.2887v2

Publ. Astron. Soc. Japan 62, pp.769-777 (2010)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

PASJ (in press)

Scientific paper

The advent of high sensitivity, high resolution gamma-ray detectors, together with a knowledge of the distribution of the atomic hydrogen and especially of the molecular hydrogen in the Galaxy on sub-degree scales creates a unique opportunity to explore the flux of cosmic rays in the Galaxy. We here present the new data on the distribution of the molecular hydrogen from a large region of the inner Galaxy obtained by the NANTEN Collaboration. We then introduce a methodology which aims to provide a test bed for current and future gamma-ray observatories to explore the cosmic ray flux at various positions in our Galaxy. In particular, for a distribution of molecular clouds, as provided by the NANTEN survey, and local cosmic ray density as measured at the Earth, we estimate the expected GeV to TeV gamma-ray signal, which can then be compared with observations and use to test the cosmic ray flux.

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