A search for technosignatures toward the Galactic Centre at 150 MHz
Abstract
This paper is the fourth in a series of low-frequency searches for technosignatures. Using the Murchison Widefield Array over two nights, we integrate 7 h of data toward the Galactic Centre (centred on the position of Sagittarius A*) with a total field-of-view of 200 deg2. We present a targeted search toward 144 exoplanetary systems, at our best yet angular resolution (75 arcsec). This is the first technosignature search at a central frequency of 155 MHz toward the Galactic Centre (our previous central frequencies have been lower). A blind search toward in excess of 3 million stars toward the Galactic Centre and Galactic bulge is also completed, placing an equivalent isotropic power limit < 1.1×1019 at the distance to the Galactic Centre. No plausible technosignatures are detected.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- March 2022
- DOI:
- 10.1017/pasa.2022.5
- arXiv:
- arXiv:2202.03324
- Bibcode:
- 2022PASA...39....8T
- Keywords:
-
- planets and satellites: detection;
- radio lines: planetary systems;
- instrumentation:interferometers;
- techniques: spectroscopic;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 13 pages, 6 figures, accepted for publication in PASA