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Flows of hot plasma connecting the Milky Way center to the corona, halo and beyond
 
Scientific interests
 
 
Galactic Center
 

Hot Milk: The hot phase of the Milky Way
This will be my major field of research for the next years.
Ponti et al. 2015; 2019.

 

The present activity of Sgr A*, the central supermassive black hole
I have been and I am still planning multi-wavelength campaigns to monitor the present activity of Sgr A* and to determine its primary radiative mechanism during X-ray flares.
Ponti et al. 2017.

 

Sgr A* past activity
Since more than a decade, my team and I have been monitoring the massive molecular clouds around Sgr A*, which are acting as mirrors of a past bright period of past activity of Sgr A* itself. Using such light echo, we have been constraining the past activity of Sgr A* and the 3 dimensional distribution of the clouds. Ponti et al. 2010; 2013.

 
Accretion Physics
 

Winds in X-ray binaries
XMM-Newton and the grating instrument aboard Chandra allowed us to demonstrate some of the fundamental roles played by winds in X-ray binaries for accretion physics. This field will see a huge leap forward when the planned X-ray calorimetric missions (such as XRISM and Athena) will be launched. Ponti et al. 2012; 2015; 2018; 2019.

 

Timing in accreting sources
Variability is one of the characteristics properties of accreting sources. Since the time of my master thesis I’ve been interested in characterising X-ray variability in accreting sources (AGN and X-ray binaries). Ponti et al. 2004; 2012.

 

Reverberation lags
Time lags represent a powerful tool to constrain the geometry of the variable X-ray sources and in particular of their accretion flow. I have supervised some of the excellent scientists working in the field. De Marco et al. 2013; 2013b; 2015; 2017.

 

Strong gravity and outflows in AGN
Since the time of my PhD I have been interested in using X-ray observation to constrain general relativity in the strong gravitational field, through the observation of relativistically broadened lines. Ponti et al. 2006; Ponti et al. 2010.

 

Outflows in AGN
I have been and I am still involved in the design and realisation of several multi-wavelength campaigns aimed at investigating the physics of outflows in AGN. Kaastra et al. 2014.

 
New exciting ideas
 

Additionally, I am always looking out for interesting new project to start working on!

 
 

This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation
programme (grant agreement No. [865637])

  
  
Banner image: The central regions of our galaxy, the Milky Way, seen in X-rays by ESA’s XMM-Newton X-ray observatory - Date: 20 August 2015 - XMM-Newton Satellite - Copyright: ESA/XMM-Newton/G. Ponti et al. 2015 - Web site credit: G. Ponti - M.R. Panzera