Space Telescope Science Institute
In 2017 Romeel Dave and I edited a book on Gas Accretion onto Galaxies, published by Springer. This is a contributed volume with 15 chapters written by 15 authors reviewing the inflow of gas onto galaxies. Find the chapters here.
I'm the Principal Investigator of two HST program totaling 70 orbits to study the Galactic Center region in UV absorption. Our results dicussing the absorption-line properties of the biconical outflow at the center of the Milky Way are described in a series of papers in the Astrophysical Journal.
The Magellanic Stream is a giant tidal tail of gas stipped out the Magellanic Clouds and now orbiting the Milky Way. See the Annual Reviews of Astronomy & Astrophysics article I wrote with Elena D'Onghia on this extraordinary stream or the press releases described below.
The Galactic nuclear wind is feeding the giant Fermi Bubbles with new material. Our Galactic Center program has led to two NASA press releases, one in 2015 on the discovery of the wind in UV absorption and one in 2017on the northern sky survey.
This enormous tail of gas trailing the Magellanic Clouds holds clues to the formation of the Milky Way Galaxy and the Magellanic Clouds. We explore its origin using chemical composition analyses with Hubble and the Green Bank Telescope. See our 2013 NASA Press Release.
The enigmatic Smith Cloud is a massive infalling gas cloud close to impacting the Galactic disk. Its origin is unknown. We used Hubble to measure its chemical compostion and probe its source. See our 2016 NASA press release.
The titanic explosion that created the Fermi Bubbles also produced an ionization cone that appears to have heated the Magellanic Stream, causing elevated H-alpha emission and UV ionization ratios. This story was announced by the ASTRO-3D center in Sydney and featured on BBC News.
Using observations from the Cosmic Origins Spectrograph (COS) on Hubble we measured the rates at which the Milky Way is gaining and losing mass, finding an excess of inflow. This story was covered by NASA, Phys.org and Universe Today.
The Leading Arm is a series of gas clouds connecting the Magellanic Clouds to the Milky Way. We measured its chemical composition and found it is spatially variable, providing new clues on its origin. These results were featured in a 2018 NASA press release.