Commander component separation: Extracting different CO components from the Planck data.
Rotational transition lines of carbon monoxide (CO) are one of the major tracers used to study star forming regions and Galactic structure. For cosmic microwave background (CMB) analysis of the Planck data, the CO rotational lines are picked up by the detectors observing in the frequency ranges of the CO transitional lines, creating strong foreground signals that need to be modeled. Though there are a large number of observations of CO rotational lines covering the Galactic plane, the Planck 2016 data release gave us the first full sky coverage CO maps. However, since the measured signal in the Planck detectors is integrated over a large bandpass, each CO product from Planck 2016 will be a composite map of several rotation lines, the main two being 12CO and 13CO.
In this talk I will talk about the improvements we have done in the extraction of the CO signal since the 2016 Planck data release, using improved modeling of the CO components, former CO observations, and the new NPIPE single detector sky maps of the Planck data.