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“Cool metal gas search!” Thanks! It was automated.

6 May 2021, 20:54 UTC
“Cool metal gas search!” Thanks! It was automated.
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Title: Characterizing the abundance, properties, and kinematics of the cool circumgalactic medium of galaxies in absorption with SDSS DR16Authors: Abhijeet Anand, Dylan Nelson, Guinevere KauffmannFirst Author’s Institution: Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching, GermanyStatus: Accepted to MNRAS.The circumgalactic medium—the halo of gas surrounding galaxies—could play a large role in galaxy evolution, as it regulates the availability of gas for the galaxy. The origin of this gas is still not completely understood. It can come from the galaxy itself in the form of outflows from active galactic nuclei (AGN) or supernovae, as well as infalling gas from the intergalactic medium (IGM).One way to study the CGM is using the spectra of bright background sources such as quasars (check out this astrobite for a quick guide on how spectroscopy works!). Quasar spectra (example in Figure 1) show continuum emission that comes from the hot accretion disk, as well as broad emission lines from gas orbiting near the supermassive black hole. Quasar spectra also exhibit absorption lines. Some of this absorption comes from gas in quasar accretion disk winds, but some of it has nothing to do with the quasar at all! As light from the quasar travels towards us, some of ...

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