Cicone et al. (2019, Astro2020 Science WP)
Traditionally the circumgalactic medium (CGM) was thought to consist of warm and hot gas, but recent breakthroughs are presenting a new scenario according to which an important fraction of its mass may reside in the cold atomic and molecular phase. Such cold CGM, especially in local galaxies where its projected size is expected to be of several arcminutes, cannot be imaged by interferometers due to spatial scale filtering of large-scale structures. The only way to probe the multiphase CGM including its coldest component is through a large (e.g. 50-m class) single dish (sub-)mm telescope. This issue is illustrated in the figure, which shows the expected molecular CGM of a star forming galaxy at z = 0.02 as seen by different (sub-)mm facilities after 10 hours of observations. Full white paper available at this link.
Cicone et al. (2018, ApJ)
ALMA observations of the neutral Carbon line ([CI]1-0) in NGC6240 shed light on the state of the gas entrained in the massive molecular outflow, hence allowing us to constrain its extreme energetics. Furthermore, the high-resolution ALMA [CI] images surprisingly reveal that the outflow is launched between the two AGNs rather than from either of the two. ADS link to the article.
Severgnini, Cicone et al. (2018, MNRAS)
The 123-month Swift-BAT monitoring of the nearby Seyfert galaxy MCG+11-11-032 reveals a modular behaviour with peaks and dips occurring almost every 25 months. Under the hypothesis of an SMBH pair, such variability would imply a small sub-pc separation with an orbital velocity of ~0.06c. This value is in remarkable agreement with the energy offset of the two FeK emission lines detected in the Swift XRT spectrum of this source.
ADS link to the article.