VLA & HST Monitoring of Sgr A* in July 2019 with Spitzer and Chandra

Project: Research project

Project Details


We have planned a coordinated campaign involving HST (near-IR), VLA (30-40 GHz), Spitzer(4.5 micron) and Chandra (2-10 keV) to monitor the fluctuating emission from the supermassive black hole at the Galactic center known as Sgr A*. The PI is also proposing to use ALMA (millimeter) and VLBA (3-7mm) for simultaneous monitoring of Sgr A* in addition to the approved observing programs stated above. These observatories will take place in in July 2019, in windows of two long days. The campaign will monitor in the radio and near-IR with the VLA using two tracks (2$\times7h$) and HST for a total of eight orbits ($12h$), respectively. In particular HST time is critical to obtain near-IR observations simultaneous with radio while long duration mid-IR and X-rays observations are being carried out with Spitzer and Chandra. There is no simultaneous observations of Keck or VLT during which the VLA observed Sgr A*. These observations will characterize time variability of Sgr~A* over a wide range of time scales and the light curves from each instrument need to be calibrated and then cross correlated with the HST using WFC3.
Effective start/end date8/1/197/31/22


  • Space Telescope Science Institute (HST-GO- 15667.001-A//NAS5-26555-01)
  • National Aeronautics and Space Administration (HST-GO- 15667.001-A//NAS5-26555-01)


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