Hubble Observations Document Orthogonal Bulge Rotation in Spiral Galaxy NGC 4698
What Was Observed (Empirical Data)
The NASA/ESA Hubble Space Telescope captured optical imaging of spiral galaxy NGC 4698 in the Virgo Cluster, measuring an elongated central bulge oriented at a right angle to the primary galactic disc. Photometric and kinematic data reveal that older stellar populations and gas within the central core rotate perpendicularly relative to the outer disc. The data also detect signatures of active gas accretion feeding a central supermassive black hole estimated at millions of solar masses.
The Reality Check (Anti-Hype Analysis)
Sensational framing of the galaxy as 'chaotic' or 'spinning out of sync' misrepresents kinematically decoupled cores, which are established dynamical features resulting from past minor mergers or orthogonal gas capture. The perpendicular alignment does not signal physical instability or unknown physics, but rather preserves the orientation of accreted material within the gravitational potential. Furthermore, broadband imaging confirms the morphological anomaly, but definitive reconstruction of the merger history requires high-resolution integral field spectroscopy.
PRIMARY SOURCE:
European Space Agency (Space Science)