NGC 7098 - (R1R2')SAB(rs)ab

NGC 7098

De Vaucouleurs Atlas Type: (R1R2')SAB(rs)ab

Filter: B

Telescope: CTIO 1.5-m
North , East
Field Dimensions: 6.2 x 4.7 arcminutes

RC3 Type: (R)SAB(rs)a
RSA Type: -----
Surface Brightness Range Displayed: 18.0-27.0 mag per square arcsec
Absolute Blue Magnitude: -20.7

De Vaucouleurs Atlas Description:

This galaxy is most remarkable for its interesting bar. The bar is a broad oval with very prominent, nearly straight ansae , such that in projection the feature looks like a parallelogram. In the B-I color index map, these ansae are seen to have no color contrast, implying they are stellar dynamical phenomena. At a radius more than 50\% larger than that of the bar, an inner ring made of possibly four wrapped spiral segments is found. The feature is sufficiently closed to merit the (r) classification. Outside the inner ring , a well-defined outer ring is found which shows doubling due to two closely wrapped spiral arms. This feature appears to be part of an (R1R2') morphology .The color index map shows that both rings are affected by recent star formation (see also the H-alpha map of Crocker, Baugus, and Buta 1996), and that there is no nuclear star formation or leading bar dust lanes. NGC 7098 is described as double-barred by Erwin (2004 and references therein).