出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present HI- and optical (i0-band) data of the well known “Spindle” galaxy NGC 2685, along
with our tilted-ring analysis of the obtained HI data cubes. The optical appearance of the galaxy
on the sky suggests that this galaxy is a classical polar-ring galaxy with an additional outer HI-ring
perpendicular to the inner one. Our observations show that this is not the case. While it is true
that the orbits of the gas change their orientations substantially towards larger radii, the HI does
not form two distinct rings but rather a coherent structure, an extreme warp with an extremely
high degree of symmetry. The optical appearance of NGC 2685 resembles the total HI intensity
to great detail so that it is likely that an extreme warp is also present in an extended stellar disk.
