We propose a four year suborbital-class research program to develop launch and operate the astrophysics research testbed and UV emission mapping imaging spectrograph (artemis): a 6U cubesat that…

We propose a four year suborbital-class research program to develop launch and operate the astrophysics research testbed and UV emission mapping imaging spectrograph (artemis): a 6U cubesat that will address two key questions in astronomy: .how do galaxies provide ionizing radiation to the IGM? The transition from a neutral to an ionized intergalactic medium (IGM) was one of the key milestones in cosmic structure formation. Finding the ionizing sources - galaxies and AGN - is a central goal of the james webb space telescope (jwst) but even this flagship cannot solve one critical aspect of the problem: how much of this radiation actually escapes galaxies to RE-ionize the IGM? Webb cannot detect the ionizing radiation itself through the opaque high-z IGM so users will instead use redshifted UV/optical emission lines as proxies. These proxies must be calibrated with direct measurements of ionizing radiation escape in a sample of galaxies at lower redshift. Artemis will directly measure the ionizing spectrum in 100 0.15