Evidence for a very low-column density hole in the Galactic halo in the direction of the high latitude molecular cloud MBM 16

Abstract

Shadow observations are the only way to observe emission from the galactic halo (GH) and/or the circumgalactic medium (CGM) free of any foreground contamination from local hot bubble (LHB) and solar wind charge exchange (SWCX). We analyzed data from a shadow observation in the direction of the high latitude, neutral hydrogen cloud MBM 16 with \Suzaku. We found that all emission can be accounted for by foreground emission from LHB and SWCX, plus power law emission associated with unresolved point sources. The GH/CGM in the direction of MBM 16 is negligible or inexistent in our observation, with upper limits on the emission measure of 9.5x10^{-4} pc cm^{-6} (90% C.L.), at the lowest end of current estimates.

5 Pages, 3 Figures, Accepted for Publication on ApJ

References in corpus (5)

• Constraining the Milky Way's Hot Gas Halo with OVII and OVII Emission Lines
• An XMM-Newton Survey of the Soft X-ray Background. III. The Galactic Halo X-ray Emission
• Xmm-Newton Observations of the Diffuse X-ray Background
• Chandra and Far Ultraviolet Spectroscopic Explorer Observations of z~0 Warm-Hot Gas Toward PKS 2155-304
• OI Fluorescent Line Contamination in Soft X-Ray Diffuse Background Obtained with Suzaku/XIS

Cited by in corpus (2)

• The Structure of the Local Hot Bubble
• A High Spectral Resolution Study of the Soft X-ray Background with the X-ray Quantum Calorimeter