|Title||Resolving a Mystery: What is the Emission Measure of the Local Hot Bubble?|
|Author||Dr Randall Smith|
|Description||MBM12 is a nearby molecular cloud that absorbs nearly all background emission from O VII and O VIII. Observing diffuse O VII and O VIII towards MBM12 fixes the emission measure in the Local Hot Bubble (LHB). Suzaku recently observed MBM12 and found the O VII to be 3x brighter than predicted from canonical LHB models, although this could have been affected by solar wind charge exchange (SWCX). Fortunately, the SWCX rate is known to vary with time, viewing geometry and solar wind flux, so a second observation would likely detect a change. We propose to observe MBM12 with XMM-Newton to confirm the recent measurement. If confirmed, this result will require a reanalysis of existing LHB models and at put strong limits on the depletion of Si and Fe relative to O in the LHB.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2009-03-10T00:00:00Z, 050137, 17.56_20190403_1200. https://doi.org/10.5270/esa-g150rsw|