Measuring the Age of the Local Bubble by Observing O VII and O VIII Emission Towards MBM 12

Details Measuring the Age of the Local Bubble by Observing O VII and O VIII Emission Towards MBM 12 Measuring the Age of the Local Bubble by Observing O VII and O VIII Emission Towards MBM 12

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop...19s&link_type=abstract

Chandra Proposal ID #01910242

Physics

Chandra Proposal Id #01910242

Scientific paper

We propose to observe the nearby molecular cloud MBM 12, which shadows 70%-95% of the 3/4 keV (0.44-1.21 keV) diffuse background, in order to observe the foreground emission from O VII and O VIII at 0.57 and 0.65 keV. This will be the first-ever detection of an identifiable emission line from the Local Bubble. The O VIII/O VII ratio depends sensitively on the time since the gas was heated by a shock, and therefore determines the age of the Local Bubble. This observation will also help distinguish between models of the ISM dominated by hot or warm gas. If the Local Bubble is young (1e5 yrs) and already large, this suggests the ISM is filled with hot gas. If it is old (>1e6 yrs), then this would suggest bubbles do not break out and do not fill the ISM with hot gas.

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