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For refcode 1998AJ....116.1221E:
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Copyright by American Astronomical Society. Reproduced by permission
1998AJ....116.1221E NEAR-INFRARED OBSERVATIONS OF A NUCLEAR BAR AND BICONICAL STRUCTURE IN THE STARBURST GALAXY NGC 6946 DEBRA MELOY ELMEGREEN, FREDERICK R. CHROMEY, AND MICHAEL SANTOS Department of Physics and Astronomy, Vassar College, Poughkeepsie, NY 12604 elmegreen@vassar.edu, chromey@vassar.edu, misantos@vassar.edu Received 1998 May 13; revised 1998 May 29 ABSTRACT We use high-resolution near-infrared (J- and K-band) images of the nuclear starburst galaxy NGC 6946 to compare stellar morphology with the previously published distribution of CO in the central regions. We find a small stellar bar with a length of 210 pc, which lies perpendicular to an 1860 pc long stellar oval distortion. The small bar has a position angle of 1400, which coincides with a barlike feature in CO, as well as with the kinematic minor axis. It has a flat light distribution and a strong bar- interbar contrast of 1 mag; it may play a role in fueling the central starburst despite its small size. A biconical structure about 80 pc long, perpendicular to the bar, is evident in the (J - K) color map. The (J - K) contours match published high-resolution CO contours very well. Key words: galaxies: active-galaxies: nuclei-galaxies: starburst
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