A deep search for a hot halo of NGC 5746: Constraining disk galaxy formation

Details A deep search for a hot halo of NGC 5746: Constraining disk galaxy formation A deep search for a hot halo of NGC 5746: Constraining disk galaxy formation

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...71r&link_type=abstract

XMM-Newton Proposal ID #06518901

Mathematics

Logic

Galaxies, Galactic Surveys, Ngc 5746

Scientific paper

Most galaxy formation models predict that massive low-redshift disk galaxies are embedded in extended hot halos of externally accreted gas. Yet observational studies have so far failed to detect soft X-ray emission from such halos. Our cosmological simulations, the first to produce fully realistic disk galaxies, suggest this is within reach but requires a factor of 10 increase in sensitivity compared to existing X-ray studies. We propose a deep observation of the massive spiral NGC5746, to decisively test for the presence of such a halo and constrain its properties. A detection will confirm a basic tenet of disk galaxy formation models, whereas a non-detection will seriously challenge these models and impose new constraints on the growth mode and feedback history of disk galaxies.

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