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Low radio frequency spectrum of Sgr-A*

Published online by Cambridge University Press:  09 February 2017

Subhashis Roy
Subhashis Roy*
Affiliation:
NCRA-TIFR, Pune University Campus, Pune-411007, India email: [email protected]
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Abstract

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We observed the Galactic centre (GC) region with the partially upgraded Giant Metrewave Radio Telescope (GMRT) using a wideband system in frequency ranges of 300– 500 MHz with 16 antennas. Preliminary results are presented here. Sgr-A* is clearly detected down to 450 MHz. Sgr-A West slowly disappears at lower frequencies across the band. By taking cross-cuts across the known major-axis of Sgr-A*, we measure its total flux density across the band to be 0.4 Jy consistent with what is expected from earlier results. It clearly indicates lack of absorption from Sgr-A West. Its spectral index is consistent with its higher frequency value of +0.3.

Keywords

Galaxy: center–radio continuum: ISM–H II regions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 54 - 55
Copyright
Copyright © International Astronomical Union 2017 

References

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