UV light associated with the gas is faint, but brighter in the infrared due to the presence of dust that impacts the UV more than the IR. Left: Map of the galaxy PACS-867 taken by ALMA where carbon monoxide (CO) emission shows molecular gas reservoir out of which stars form. Center: Image taken by Hubble Space Telescope Advanced Camera for Surveys of PACS-867 showing rest-frame UV light from young stars in individual components of highly disturbed galaxies as a result of a massive merger. Location of molecular gas in Left image is overlaid (blue contours), showing where new stars are forming. Right: Spitzer Space Telescope infrared image (3.6 micron) of
PACS-867 highlights stars embedded in dust and associated with molecular gas.
Left image credit: ALMA (ESO/NAOJ/NRAO), J. Silverman (Kavli IPMU),
Center image credit: NASA/ESA Hubble Space Telescope, ALMA
(ESO/NAOJ/NRAO), J. Silverman (Kavli IPMU), Right image credit:
NASA/Spitzer Space Telescope, ALMA (ESO/NAOJ/NRAO), J. Silverman