A proposal for enhancing technosignature search toward the Galactic center

Abstract

We discuss the possibility of enhancing intelligent life searches toward the Galactic center. From the clockwork orbital motions of stars around the Sgr A${}^{\ast }$ black hole, we can determine the distance to the Galactic center at an exceptional accuracy, despite its remoteness $\sim 8.3$kpc. In addition, we can define precise reference epochs by selecting a prominent object such as the bright B-type star S2. These properties have a particular affinity for the coordinated signaling scheme which was hypothesized by Seto (2019) for systematically connecting intentional senders to searchers without a prior communication. If S2 is actually being used as a common reference clock, we can compress the search directions around the Galactic center by more than two orders of magnitude, with the scanning interval of $\sim 16$yr.

7 pages, 6 figures, accepted for publication in ApJ

References in corpus (9)

• Improved GRAVITY astrometric accuracy from modeling of optical aberrations
• A Precise Proper Motion for the Crab Pulsar, and the Difficulty of Testing Spin-Kick Alignment for Young Neutron Stars
• The Breakthrough Listen Search For Intelligent Life Near the Galactic Center I
• Observation of S4716 -- a Star with a 4 yr Orbit around Sgr A*
• A 4-8 GHz Galactic Center Search for Periodic Technosignatures
• A Search for Technosignatures toward the Galactic Centre at 150 MHz
• Possibility of a coordinated signaling scheme in the Galaxy and SETI experiments
• Signal Synchronization Strategies and Time Domain SETI with Gaia DR3
• Search for Galactic Civilizations Using Historical Supernovae