STUDYING the INTERSTELLAR MEDIUM and the INNER REGION of NPS/LOOP 1 with SHADOW OBSERVATIONS TOWARD MBM36

E. Ursino, M. Galeazzi, W. Liu

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We analyzed data from a shadow observation of the high density molecular cloud MBM36 (l ∼ 4°, b ∼ 35°) with Suzaku. MBM36 is located in a region that emits relatively weakly in the 3/4 keV band compared to the surrounding North Polar Spur (NPS)/Loop 1 structure and the Galactic Bulge (GB). The contrast between high and low density targets in the MBM36 area allows one to separate the local and distant contributors to the soft diffuse X-ray background, providing a much better characterization of the individual components compared to single pointing observations. We identify two non-local thermal components, one at kT ≈ 0.12 keV and one at kT ≈ 0.29 keV. The colder component matches well with models of emission from the higher latitude region of the GB. The emission of the warmer component is in agreement with models predicting that the NPS is due to a hypershell from the center of the Milky Way. Geometrical and pressure calculations rule out a nearby bubble as responsible for the emission associated with the NPS. Any Galactic Halo/circumgalactic halo emission, if present, is outshined by the other components. We also report an excess emission around 0.9 keV, likely due to an overabundance of Ne ix.

Original languageEnglish (US)
Article number33
JournalAstrophysical Journal
Volume816
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • Galaxy: structure
  • ISM: general
  • ISM: structure
  • X-rays: ISM
  • X-rays: diffuse background
  • local interstellar matter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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