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Welcome!

I am an astronomer at University of Massachusetts Amherst. Here you can get a glimpse of my research activtities.

How galaxies get their gas and how much mass, energy, and metals galaxies return to their surroundings are questions central to our understanding of galaxies and the intergalactic medium. Only stars synthesize metals. Yet only about half of the generated elements are found in stars and the interstellar medium. Galaxies are also missing their share of baryonic matter. Understanding the  flows of the matter/energy in and around galaxies, or their "ecosystem'', is the
focus of my research.

A key to the understanding of the matter and energy flows is the study of various high-energy feedback processes in galaxies. I have concentrated on four closely-related aspects of this research topic:
  1. examining various high-energy sources of the interstellar medium (e.g., supernova remnants, superbubbles, and galactic nuclear regions);
  2. characterizing the global structure as well as the physical and chemical states of hot gas in and around galaxies; 
  3. investigating the interplay of the hot gas with other galactic components;
  4. exploring the interaction of galaxies with their environment, particularly the intragroup/cluster media.
I primarily uses radio, infrared, ultraviolet, and X-ray observations to conduct these studies. I also carry out theoretical and computational studies with my students and collaborators.

Brief CV

Research Projects

  • Galactic Nuclear Regions:
    • Systematic X-ray study of  the Galactic supermassive black hole Sgr A*
    • Variability studies of stars in the Galactic center
    • Multi-band infrared mapping of the Galactic nuclear region
    • Large Millimeter Telescope  Mapping of the Galactic Central Molecular Zone
    • Chandra mapping of the Galactic bulge/center interface
  •  Galactic Feedback and Ecosystem of Galaxies:
    • Chandra X-ray Visionary Program (3 Ms) of the 30 Dorado Nebula
    • Multi-wavelength Study of M31 Nucleus and Bulge
    • Multi-wavelength study of edge-on galaxies, including  CHANG-ES (Continuum HAlos in Nearby Galaxies --  an EVLA Survey), as well as Chandra/XMM-Newton Surveys
    • Hubble/COS spectroscopic and X-ray studies of the QSO/galaxy cluster pairs.
    • Sunyaev-Zel'dovich Effect of Galaxy Clusters at the Highest Redshifts: LMT High-Resolution Mapping

Students and Postdocs

    • UMass postdoc, graduate and undergradute students whom I am working with:  Shuinai Zhang, Zhiyuan Ji, Yuping Tang, Patrick Kamieneski, Bingqing Sun, Joseph Burchett, Kendall Sullivan, Dylan Pare, Reid Contente, and Yuxuan Zeng.
    • Former Students and Postdocs/Visiting Scholars

Selected recent invited talks