Science with XRISM

At 23:42 UTC on September 6th, 2023, the X-ray Imaging and Spectroscopy Mission (XRISM) lifted off from Tanegashima Space Center in Japan, ushering in a new era of high-energy astrophysics. XRISM, an international JAXA/NASA collaboration including participation from ESA, is an advanced X-ray observatory capable of carrying out a science program that will address some of the most important questions in astrophysics in the 2020s. XRISM is essentially a rebuild of the Hitomi (Astro-H) spacecraft that was lost due to an operational mishap early in the mission in 2016. Resolve, the primary instrument on XRISM, is a high-resolution, non-dispersive X-ray spectrometer operating between 0.3-12 keV, providing high-resolution (~5 eV) spectroscopic capabilities in this critical energy band with a response peaking around the ubiquitous 6.4 keV Fe K-α line. A wide-field imager, Xtend, will offer simultaneous coverage over nearly a 40′ square field of view, with ~1′ spatial resolution. XRISM will study all manner of astrophysical objects, including galaxies and clusters, AGN, X-ray binaries, supernova remnants, transient phenomena, stars, and the interstellar medium. In this talk, I will highlight some of the scientific topics that XRISM will address, with a particular focus on science within our galaxy: supernova remnants, accreting binaries, diffuse nebulae, etc. I will also give an overview of the XRISM GO program and discuss synergies with other wavelengths.