A dataset provided by the European Space Agency

Proposal ID 050375
Title The Mass and Size of the Hot Galactic Halo
Download Data Associated to the proposal

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503750101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503750301
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503750401
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503750501
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503750601
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503750701

DOI https://doi.org/10.5270/esa-82l1yfz
Principal Investigator, PI Prof Joel Bregman
Abstract Absorption in the OVII (21.60 A) line at zero redshift shows the presence of hotgas. Our recent study, using 26 absorption sightlines, shows that thisabsorption is probably from a halo around the Milky Way rather than a LocalGroup medium. However, the size of the hot halo is poorly known (15-110 kpc)because there are no useful existing absorption sightlines across the Galacticbulge, which provide the strongest constraints. We propose a lengthy observationof the brightest known AGN in the direction of the Galactic bulge, whereexisting data indicate an absorption line of above average strength. Theresulting equivalent width measurement will strongly constrain the size and massof the hot halo.
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2007-10-09T23:46:20Z/2007-10-31T00:47:44Z
Version PPS_NOT_AVAILABLE
Mission Description The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2008-12-11T00:00:00Z
Keywords "hot gas", "zero redshift", "absorption line", "average strength", "hot halo", "existing data", "equivalent width measurement", "strongest constraints", "absorption sightlines", "galactic bulge", "hot galactic halo"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Prof Joel Bregman, 2008, 'The Mass and Size of the Hot Galactic Halo', PPS_NOT_AVAILABLE, European Space Agency, https://doi.org/10.5270/esa-82l1yfz