期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 692, 期 1, 页码 L54-L57出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/692/1/L54
关键词
cosmic rays; diffuse radiation; gamma rays: theory; interplanetary medium; Kuiper Belt; Oort Cloud
资金
- NASA Astronomy and Physics Research and Analysis (APRA) [NNX09AC15G]
- US DOE
We calculate the gamma-ray albedo due to cosmic-ray interactions with debris (small rocks, dust, and grains) in the Oort Cloud. We show that under reasonable assumptions a significant proportion of what is called the extragalactic gamma-ray background could be produced at the outer frontier of the solar system, and may be detectable by the Large Area Telescope, the primary instrument on the Fermi Gamma-ray Space Telescope. If detected, it could provide unique direct information about the total column density of material in the Oort Cloud that is difficult to access by any other method. The same gamma-ray production process takes place in other populations of small solar system bodies, such as Main Belt asteroids, Jovian and Neptunian Trojans, and Kuiper Belt objects. Their detection can be used to constrain the total mass of debris in these systems.
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