A galactic pirouette, graceful and immense, frozen in a moment of cosmic time.
In the depths of Piscis Austrinus, galaxies IC 5175 (SB(rs)bc) and IC 5174 (Sbc) engage in a slow gravitational pirouette nearly 500 million light-years from Earth. IC 5175, the moderately inclined barred spiral near the top of the frame, spans about 1.4 arcminutes—equivalent to 122,000 light-years. Below it, IC 5174 appears nearly face-on, allowing a clear view of its spiral structure as it stretches 2.1 arcminutes across, or roughly 174,000 light-years.
Faint tidal streams arc away from both galaxies, sculpted by their mutual gravity. IC 5175 reveals a distorted spiral form and a strong central bar, its disk slightly twisted by the ongoing interaction. IC 5174, though subtler, shows faint stellar plumes, a sharply defined dust lane, and distorted blue-tinted spiral arms—suggesting active star formation likely triggered by interaction with IC 5175.
Together, they offer a momentary glimpse into the slow, complex choreography of galactic evolution: spirals drawn toward one another, reshaped by tides, and lit by the glow of newborn stars.
Imaged in LRGB on my Planewave CDK 1000 at Observatorio El Sauce, Chile.
Image acquisition and processing: Mike Selby