Evidence for Solar Wind Charge Exchange Emission Towards the Chandra Deep Field North

Details Evidence for Solar Wind Charge Exchange Emission Towards the Chandra Deep Field North Evidence for Solar Wind Charge Exchange Emission Towards the Chandra Deep Field North

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.198s&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Computer Science

Solar

Scientific paper

Soft X-ray emission from within the heliosphere is now recognized as a major source of contamination in observations of emission from hot gas in the Local Bubble and can also be significant in observations of faint extended galactic and extragalactic sources such as supernova remnants and clusters. This emission is generated by charge exchange between highly ionized solar wind ions and inflowing neutral H and He from the Local Interstellar Cloud, which immediately surrounds the Solar System. The Solar Wind Charge Exchange (SWCX) emission is expected to be enhanced in the direction downwind of the Sun where neutral He is focused by the Sun's gravity (the helium focusing cone).We present results of an analysis of observations toward the Chandra/Hubble Deep Field North in which we attempt to detect SWCX emission by comparing data collected while looking through the helium focusing cone with those collected looking away from the cone. After careful flare filtering and source exclusion we compare the spectra with particular attention to the possible presence of lines from OVII and OVIII. We compare our results with models for the expected emission and present the implications for the heliosphere and emission from the Local Bubble.

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