XMM-NEWTON OBSERVATIONS OF MBM 12: MORE CONSTRAINTS ON THE SOLAR WIND CHARGE EXCHANGE AND LOCAL BUBBLE EMISSIONS

We present the first analysis of an XMM-Newton observation of the nearby molecular cloud MBM 12. We find that in the direction of MBM 12 the total OVII (0.57 keV) triplet emission is 1.8(-0.6)(+0.5) photons cm(-2) s(-1) sr(-1) (or line units, LU) while for the OVIII (0.65 keV) line emission we find a 3 sigma upper limit of < 1 LU. We use a heliospheric model to calculate the OVII and OVIII emission generated by Solar Wind Charge-eXchange (SWCX) which we compare to the XMM-Newton observations. This comparison provides new constraints on the relative heliospheric and Local Bubble contributions to the local diffuse X-ray background. The heliospheric SWCX model predicts 0.82 LU for OVII, which accounts for similar to 46% +/- 15% of the observed value, and 0.33 LU for the OVIII line emission consistent with the XMM-Newton observed value. We discuss our results in combination with previous observations of MBM 12 with Chandra and Suzaku.