Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-23T23:35:19.695Z Has data issue: false hasContentIssue false

Low radio frequency spectrum of Sgr-A*

Published online by Cambridge University Press:  09 February 2017

Subhashis Roy*
Affiliation:
NCRA-TIFR, Pune University Campus, Pune-411007, India email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

References

Nord, M. E., Lazio, T. J. W., Kassim, N. E., et al. 2004, AJ, 128, 1646 Google Scholar
Roy, S. & Pramesh Rao, A. 2004, MNRAS, 349, L25 Google Scholar
Lo, K. Y., Shen, Z., Zhao, J., & Ho, P. T. P., 1998, ApJL, 508, L61 Google Scholar