A mostly black & white digital sketch, with some yellow accents showing the XRISM X-ray satellite (looking very golden), looking at the Perseus cluster. A "zoom" onto the X-rays going from the cluster to the satellite is showing the iron line region of the spectrum around 6.5-7.0 keV, with the Fe24+ and Fe25+ line complexes, which are seen as complex lines with structures not just broad Gaussians.
https://files.mastodon.social/media_attachments/files/111/023/374/796/083/453/original/0750fb444f9e53ce.jpg