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Solar Wind Charge Exchange Contribution To The ROSAT Sky Survey MapsDXL (Diffuse X-ray emission from the Local Galaxy) is a sounding rocket mission designed to estimate the contribution of solar wind charge eXchange (SWCX) to the diffuse X-ray background and to help determine the properties of the Local Hot Bubble. The detectors are large area thin-window proportional counters with a spectral response that is similar to that of the PSPC (Position Sensitive Proportional Counters) used in the ROSAT All Sky Survey (RASS). A direct comparison of DXL and RASS data for the same part of the sky viewed from quite different vantage points in the solar system, and the assumption of approximate isotropy for the solar wind, allowed us to quantify the SWCX contribution to all six RASS bands (R1-R7, excluding R3). We find that the SWCX contribution at l = 140 degrees, b = 0 degrees, where the DXL path crosses the Galactic plane, is 33 percent plus or minus 6 percent (statistical) plus or minus 12 percent (systematic) for R1, 44 percent plus or minus 6 percent plus or minus 5 percent for R2, 18 percent plus or minus 12 percent plus or minus 11 percent for R4, 14 percent plus or minus 11 percent plus or minus 9 percent for R5, and negligible for the R6 and R7 bands. Reliable models for the distribution of neutral H and He in the solar system permit estimation of the contribution of interplanetary SWCX emission over the the whole sky and correction of the RASS maps. We find that the average SWCX contribution in the whole sky is 26 percent plus or minus 6 percent plus or minus 13 percent for R1, 30 percent plus or minus 4 percent plus or minus 4 percent for R2, 8 percent plus or minus 5 percent plus or minus 5 percent for R4, 6 percent plus or minus 4 percent plus or minus 4 percent for R5, and negligible for R6 and R7.
Document ID
20170002346
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Uprety, Y.
(Miami Univ. Coral Gables, FL, United States)
Chiao, M.
(Alcyon Technical Services-JV, Inc. Huntsville, AL, United States)
Collier, M. R.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Cravens, T.
(Kansas Univ. Lawrence, KS, United States)
Galeazzi, M.
(Miami Univ. Coral Gables, FL, United States)
Koutroumpa, D.
(Universite de Versailles Saint-Quentin-en-Yvelines Versailles, France)
Kuntz, K. D.
(Johns Hopkins Univ. Baltimore, MD, United States)
Lallement, R.
(Centre National de la Recherche Scientifique Meudon, France)
Lepri, S. T.
(Michigan Univ. Ann Arbor, MI, United States)
Liu, W.
(Miami Univ. Coral Gables, FL, United States)
McCammon, D.
(Boston Univ. Boston, MA, United States)
Morgan, K.
(Boston Univ. Boston, MA, United States)
Porter, F. S.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Prasai, K.
(Miami Univ. Coral Gables, FL, United States)
Snowden, S. L.
(Alcyon Technical Services-JV, Inc. Huntsville, AL, United States)
Thomas, N. E.
(Alcyon Technical Services-JV, Inc. Huntsville, AL, United States)
Ursino, E.
(Miami Univ. Coral Gables, FL, United States)
Walsh, B. M.
(Boston Univ. Boston, MA, United States)
Date Acquired
March 17, 2017
Publication Date
September 23, 2016
Publication Information
Publication: The Astrophysical Journal
Publisher: IOP
Volume: 829
Issue: 2
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astronomy
Solar Physics
Report/Patent Number
GSFC-E-DAA-TN40086
Funding Number(s)
CONTRACT_GRANT: NNG15CR66C
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Other
Keywords
sxcx
individual
local hot bubble
ISM
rosat
X-rays
individual objects
diffuse background
solar wind
sky survey maps

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