| Name: | Advait Mehla |
| Affiliation: | Indian Institute of Technology Bombay |
| Conference ID : | ASI2024_472 |
| Title : | All-sky Compton Imaging with the Daksha space mission |
| Authors : | Advait Mehla1, Sujay Mate2, Gulab Dewangan3, Varun Bhalerao1 |
| Authors Affiliation: | 1 Department of Physics, IIT Bombay, Powai, Mumbai - 400076, India
2 Department of Astronomy and Astrophysics, TIFR , Colaba, Mumbai - 400005, India
3 Inter-University Center for Astronomy and Astrophysics, Pune, Maharashtra - 411007, India |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | The proposed high-energy mission Daksha will continuously monitor the entire sky in the 1 - 1000 keV range with unprecedented sensitivity. The mission will contain an arrangement of 17 Medium Energy Packages consisting of a total of 340 Cadmium Zinc Telluride (CZT) detectors, sensitive in the 20-200 keV range. 13 of these are placed in a quasi-hemispherical arrangement, creating a dome - inside which are 4 High Energy Packages. These consist of Sodium Iodide (NaI) scintillators read by arrays of Silicon Photomultipliers (SiPMs) to cover the 100 keV - 1000 MeV energy range. Together, this geometry of detectors presents a unique opportunity to use Daksha as a Compton imager with all sky sensitivity. This imaging method relies on the nature of Compton kinematics - where, given the incident and scattered photon energies, it is possible to localize rings of likely origin in the sky for each scattering event that is detected, known as ‘event circles’. These scattering events can be detected by isolating pairs of coincident events across detectors. With the detection of enough such pairs, it is possible to find the intersection of many event circles and hence successfully localize sources in the sky. Although the X-ray background dominates over most persistent sources for short exposures, integrating over timescales on the order of the five year mission lifetime could yield enough data to develop an all-sky map in the sub-MeV energy range, which would be the first of its kind. In this talk, I will present results from extensive GEANT4 simulations of Daksha as a Compton imager. I will detail the methods used, and share results obtained for different astrophysical sources.
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