circumgalactic medium
(CGM)
(gas surrounding a galaxy)
The circumgalactic medium (CGM) is
the gas (and perhaps dust)
surrounding galaxies,
generally what's beyond the thick disk but
within its virial radius.
(galaxies,gas,dust)
Further reading:
https://ui.adsabs.harvard.edu/abs/2017ARA%26A..55..389T/abstract
https://hubblesite.org/uploads/science_paper/file_attachment/175/pdf.pdf
Index