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A disk-dominated and clumpy circumgalactic medium of the Milky Way seen in X-ray emission
Kaaret, P.; Kuntz, K. D.; Koutroumpa, D. +7 more
The Milky Way galaxy is surrounded by a circumgalactic medium1 that may play a key role in galaxy evolution as the source of gas for star formation and a repository of metals and energy produced by star formation and nuclear activity2. The circumgalactic medium may also be a repository for baryons seen in the early universe, …
Global helium abundance measurements in the solar corona
Telloni, Daniele; Antonucci, Ester; Fineschi, Silvano +24 more
Solar abundances have been historically assumed to be representative of cosmic abundances. However, our knowledge of the solar abundance of helium, the second most abundant element, relies mainly on models1 and indirect measurements through helioseismic observations2, because actual measurements of helium in the solar atmosph…