Does O5+ trace low-pressure gas beyond the accretion shock?
- Presentation given at Joelfest Santa Cruz 2017 pdf
Multi-Density Photoionization Modeling
The video shows a reconstruction of the distribution of gas around low-redshift, Milky-Way-sized galaxies. The reconstruction is based on a new photoionization modeling method for CGM absorption lines surveys, which I developed in Stern et al. (2016) and applied to the COS-Halos survey. The new method relaxes the assumption used by almost all previous studies that the absorbing gas has a single density and physical scale, instead allowing the gas to span a range of densities and scales. Our analysis suggests an absorbing gas mass which is <20% of gas mass estimates based on standard modeling methods. The new method can be applied to additional surveys of CGM absorption lines. The realization shown in the video is described in section 4.4 of the paper.