|Title||The Mass and Size of the Hot Galactic Halo|
|Author||Prof Joel Bregman|
|Description||Absorption in the OVII (21.60 A) line at zero redshift shows the presence of hot gas. Our recent study, using 26 absorption sightlines, shows that this absorption is probably from a halo around the Milky Way rather than a Local Group medium. However, the size of the hot halo is poorly known (15-110 kpc) because there are no useful existing absorption sightlines across the Galactic bulge, which provide the strongest constraints. We propose a lengthy observation of the brightest known AGN in the direction of the Galactic bulge, where existing data indicate an absorption line of above average strength. The resulting equivalent width measurement will strongly constrain the size and mass of the hot halo.|
|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, 2008-12-11T00:00:00Z, 050375, PPS_NOT_AVAILABLE. https://doi.org/10.5270/esa-82l1yfz|