Solar Wind Charge Exchange contribution to the ROSAT All Sky Survey Maps

Abstract

DXL (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 (DXB) and to help determine the properties of the Local Hot Bubble (LHB). The detectors are large-area thin-window proportional counters with a spectral response similar to that of the PSPC 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 6 RASS bands (R1-R7, excepting R3). We find that the SWCX contribution at l=140 deg, b=0 deg, where the DXL path crosses the Galactic plane is 33%+-6% (statistical)+-12%(systematic) for R1, 44%+-\%+-5% for R2, 18%+-12%+-11% for R4, 14%+-11%+-9% for R5, and negligible for 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%+-6%+-13% for R1, 30%+-4%+-4% for R2, 8%+-5%+-5% for R4, 6%+-4%+-4% for R5, and negligible for R6 and R7.

9 pages, 13 figures, accepted for publication on ApJ

References in corpus (6)

• An XMM-Newton Survey of the Soft X-ray Background. III. The Galactic Halo X-ray Emission
• Charge-Transfer induced EUV and Soft X-ray emissions in the Heliosphere
• The origin of the 'local' 1/4 keV X-ray flux in both charge exchange and a hot bubble
• The Trouble with the Local Bubble
• Resolving the Origin of the Diffuse Soft X-ray Background
• The Solar Wind Charge-Exchange Production Factor for Hydrogen

Cited by in corpus (10)

• The Structure of the Local Hot Bubble
• SRG/eROSITA X-ray shadowing study of giant molecular clouds
• The SRG/eROSITA diffuse soft X-ray background. I. The local hot bubble in the western Galactic hemisphere
• Scientific Objectives of the Hot Universe Baryon Surveyor (HUBS) Mission
• A High Spectral Resolution Study of the Soft X-ray Background with the X-ray Quantum Calorimeter
• Fermi bubbles: high latitude X-ray supersonic shell
• MAXI/SSC All-sky maps from 0.7 keV to 4 keV
• In Search of an Interface between Warm and Hot Gas within the Local Bubble
• Point source contribution to the Diffuse X-ray Background below 1 keV and its effect on our understanding of the circum-galactic medium
• Determination of the Solar System contribution to the soft X-ray sky