The bright spiral galaxy NGC 4258 (M106) in Ursa Major. This system is distinguished by "anomalous arms", better described perhaps as jets, seen curving outward through the disk in radio emission and optical emission lines. Recent measurements of maser regions near the nucleus suggest a supermassive black hole (with mass of order 108 solar masses) at the center of this galaxy. This pseudocolor rendition was made from a V-band CCD frame covering a region 9 arcminutes square, taken with the 1.1-meter Hall telescope of Lowell Observatory.
Last changes: 5/2001 © 2001