AR 17562 (Archival Research)

Thu Jul 25 13:56:23 GMT 2024

Principal Investigator: Mary Putman
PI Institution: Columbia University in the City of New York
Investigators (xml)

Title: The Spiral Galaxy Halo Gas Profile at z=0 and the Link to Satellite Quenching
Cycle: 31

The circumgalactic medium (CGM) of a galaxy is baryon and metal rich and extends out to its virial radius. Satellite galaxies must move through this halo medium as they orbit the galaxy, and can be quenched as their gas is stripped by the host's CGM. We have identified a sample of 25 spiral galaxies within 15 Mpc for which the properties of the gaseous baryons in their dark matter halos can be measured. 26 G130M and 17 G160M COS archival spectra pass through the virial radii of the halos and cover the entire range of impact radii. The COS observations will be combined to create a generic z=0 spiral galaxy CGM profile to compare to the Milky Way, M31 and other samples. This will help us understand what dictates the CGM properties and the deficit of CGM baryons found for the Milky Way. This local spiral galaxy sample was selected so that 60% of the spirals have their satellite population quantified and the rest will have their satellite population surveyed during the proposal period. The relationship of the CGM to the satellite population will inform galaxy evolution models of galaxy quenching via ram pressure stripping.