This image reveals the distribution of cold gas that can not be seen in optical spectrums by combining the results of radio observations with ALMA and the optical observations. (alma-telescope.jp)
In addition, we present a P Cygni profile observed in the high - resolution optical spectrum, evidence of a wind driven by the accretion and being the cause for the particular morphology of the outflows. (arxiv.org)
In contrast, one operator can use an optical comb to cover the entire optical spectrum, not merely like a pianist at a piano but like a keyboardist playing an electronic synthesizer that can be programmed to mimic any musical instrument or even an entire orchestra. (scientificamerican.com)