Browsing by Subject "ISM"
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Item Effects of superbubbles on Near-IR and sub-millimeter polarization(2013-05) Delgado, Jennifer AmandaAssociations of young, massive stars can collectively energize the interstellar medium through stellar winds and SNII. The energy injected into the ISM can produce large regions of hot, diffuse gas surrounded by a swept-up dense shell of gas, dust and magnetic fields. Such structures are often termed 'superbubbles' and the change they produce in local galactic magnetic field geometry could be detectable in polarization observations. We create semi-analytical models and large 3D MHD numerical simulations of superbubbles in plane-parallel galactic atmospheres in order to produce synthetic polarization maps in 100 micron polarized dust emission and 2.2 micron starlight polarized by transmission through dust. Polarization maps that included galactic contributions to the polarization were also created. We find that luminous superbubbles that 'breakthrough' the galactic plane could produce polarization signature that is observable for favorable lines of sight.Item A Semi-Analytical Line Transfer (SALT) Model For Bi-conical Galactic Outflows(2017-08) Carr, CodyWe generalize the semi-analytical line transfer (SALT) model recently introduced by Scarlata and Panagia (2015) for modeling galactic outflows, to account for bi-conical geometries of various opening angles and orientations with respect to the line-of- sight to the observer, as well as generalized velocity fields. We model the absorption and emission component of the line profile resulting from resonant absorption in the bi-conical outflow. We show how the outflow geometry impacts the resulting line profile. We use simulated spectra with different geometries and velocity fields to study how well the outflow parameters can be recovered. We find that geometrical parameters (including the opening angle and the orientation) are always well recov- ered. The density and velocity field parameters are reliably recovered when both an absorption and an emission component are visible in the spectra. This condition implies that the velocity and density fields for narrow cones oriented perpendicular to the line of sight will remain unconstrained. To conclude, we fit the model to 10 highly compact galaxies (commonly referred to as Green Peas). We observe strong evidence for bi-conical geometries.