I study the environments surrounding supermassive black holes called active galactic nuclei (AGN). Understanding how matter falls into an AGN reveals a great deal about the conditions and geometry around it, and can even disclose properties of the black hole itself (e.g. mass and spin). I use X-ray observations to facilitate my work. X-rays are produced in the hottest and most volatile regions nearest black holes.
I am also involved in a number of new and upcoming missions that will revolutionize the field of X-ray astronomy in the near future.
I am always interested in working with motivated students. If you would like to pursue a project with me or are intetest in graduate school, feel free to contact me.
The Gallo research team.
Saint Mary's AstophysicS High-Energy ResearcherS
You can find a complete list of my publications at this ADS link.
Here, I have listed a selection of recent works including some new publications, public talks, and future mission studies. Each is linked to where you can get additional information.
We report the detection of a rapid occultation event in a nearby Seyfert galaxy. The eclipse allows us to determine the size of the X-ray region as well as the location and properties of the obscuring gas.
Multi-epoch, broadband X-ray spectroscopy of the optically-defined type 1 AGN, Mrk 1239 reveal a highly absorbed system and evidence for emission from multiple ionised plasmas. This work was led by grad student M. Buhariwalla.
Tracking changes in the optical-to-X-ray spectral energy distribution of Mrk 335 over 13-years shows the changes are related to the X-ray (i.e. corona) with only modest changes originating in the optical-UV (i.e. accretion disc). This work was led by PDF S. Tripath.
A public talk I delivered to the RASC in March 2021.
Arcus is a high resolution X-ray grating spectrometer mission that will investigate from the small scales to the largest, including the composition of minute interstellar dust grains, stellar evolution, feedback from supermassive black holes, and structure formation in galaxy clusters.
The Advanced Telescope for High ENergy Astrophysics (ATHENA) is the X-ray observatory mission selected by ESA to address the Hot and Energetic Universe scientific theme.
Saint Mary's University
Department of Astronomy & Physics
923 Robie Street, Halfiax NS, B3H 3C3, Canada
+1 902 420 5637
luigi.gallo AT smu.ca