GRAVITATIONALLY INDUCED DENSITY WAKE OF A CIRCULARLY ORBITING OBJECT AS AN INTERPRETATIVE FRAMEWORK OF UBIQUITOUS SPIRALS AND ARCS

摘要: An orbiting object in a gas-rich environment creates gravitational density wake containing information about the and its orbit. Using linear perturbation theory, we analyze observable properties of due to circularly moving static homogeneous gaseous medium, order derive Bondi accretion radius rB , orbital distance rp Mach number object. Supersonic motion, producing spiral-onion shell structure, exhibits single-armed Archimedes spiral two-centered circular arcs with respect line sight. The pitch angle, arm width, spacing pattern are entirely determined by arm-interarm contrast is proportional decreasing as function power index ?1. background distribution globally changed from initially uniform centrally concentrated. vertical structure manifested center at location. angular extent motion. Diagnostic probes nonlinear wakes such detached bow shock, absence definite inner boundary, presence turbulent low-density eddies, elongated shapes explained extension analysis. enhancement always /rp independent nonlinearity, suggesting that massive objects can substantially modify distribution.