NGC 7755 — A spiral’s grace, a collision’s memory
Unfolding in the constellation Phoenix, NGC 7755 is a barred spiral galaxy (SB(s)b) about 115 million light-yearsaway. Its sweeping arms wrap tightly around a bright core, yet the structure carries the faint scars of disturbance — subtle plumes, a warped outer disk, and a slightly twisted bar all hinting at the aftermath of a recent gravitational encounter.
Star formation blazes along the spiral arms, traced by soft blue regions and delicate Hα emission near the nucleus. The inner dust lanes spiral inward toward a compact, bright core that shows signs of low-level nuclear activity, where star formation and faint ionized emission coexist. The outer arms extend asymmetrically, their shape disturbed by tidal forces that may have funneled gas toward the center and stirred the bar into its current offset form. At the lower left, a small satellite galaxy appears to brush the edge of the main disk, possibly connected by a faint luminous bridge, suggesting an ongoing minor interaction still shaping the system’s periphery.
Spanning roughly 130,000 light-years, the galaxy appears about 4.3 × 3.2 arcminutes across the sky. Its faint outer extensions and warped contours echo a past encounter, while its luminous core continues to pulse with new star birth. NGC 7755 stands as a portrait of quiet upheaval — a spiral galaxy retaining its elegance while still carrying the imprint of its turbulent history.
Imaged in LRGB on my Planewave CDK 1000 at Observatorio El Sauce, Chile.
Image acquisition and processing: Mike Selby