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NGC 4258 is a well known spiral galaxy with a peculiar large scale jet flowdetected in the radio and in H-alpha. Due to the special geometry of thegalaxy, the jets emerge from the nuclear region through the galactic disk. Alsothe distribution of molecular gas looks different from that in other spiralgalaxies: [12]CO(1-0)emission has only been detected in the center and alongthe jets and only up to distances of about 50 arcsec (1.8 kpc) from thenucleus. The reason for the CO concentration along the inner jets in NGC 4258was not understood and is the motivation for the observations presented here.Using the IRAM interferometer, we mapped the [12]CO(1-0) emission of thecentral part of NGC 4258 along the nuclear jet direction in the inner 3 kpc. Wedetected two parallel CO ridges along a position angle of -25 degr with a totallength of about 80 arcsec (2.8 kpc), separated by a CO-depleted funnel with awidth of about 5 arcsec (175 pc). The H-alpha emission is more extended andbroader than the CO emission with its maximum just in between the two COridges. In CO we see a peculiar velocity distribution in the iso-velocity mapand p-v diagrams. We discuss different scenarios for an interpretation andpresent a model which can explain the observational results consistently. Wepropose here that the concentration of CO along the ridges is due tointeraction of the rotating gas clouds with the jet's magnetic field byambipolar diffusion. This magnetic interaction is thought to increase the timethe molecular clouds reside near the jet thus leading to the quasi-static COridge.Comment: 13 pages, accepted by A&

Magnetic interaction of jets and molecular clouds in NGC 4258