Abstract
view Abstract Citations (84) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Motions in Barred Spiral Galaxies. I. The Nuclei of NGC 1097 and NGC 1365. Burbidge, E. Margaret ; Burbidge, G. R. Abstract The nuclear regions of the barred spirals NGC 1097 and NGC 1365 are shown and described. Spectra of these nuclei have been obtained, and the rotations have been measured from the Ha and [N ii] x 6583 emission lines. The rotation-curve of the nucleus of NGC 1097 is discontinuous in the inner part. The nuclear region in this galaxy consists of a small inner amorphous nucleus and an outer segmented annulus; the cause of the velocity discontinuity may be that the emission lines arise only in the annulus. The rotation-curve of NGC 1365 is linear across the nucleus. The observed rotations of both nuclei are quite large, the velocity difference from one side' to the other amounting to 413 km/sec in NGC 1097 and 431 km/sec in NGC 1365. If rotation alone is present, these, when corrected for orientation, give 549 km/sec across a diameter of about 20" or 1600 pc in NGC 1097 and 808 km/sec across a diameter of about 30" or 3000 pc in NGC 1365. It is stressed that the apparent rotational velocity might contain a component due to expansion in the planes' of the galaxies, whose magnitude could not be measured in objects whose major axes are not unequivocally determined from their geometry. Mass estimates of the nuclei from the rotations are 0.5-1.3 X 1011 `Mo in NGC 1097 and 2.2-3.4 X 1010 Mo in NGC 1365. These correspond to mean densities of >38 Mo/pc3 in NGC 1097 and 7-23 Mo/pc3 in NGC 1365. Publication: The Astrophysical Journal Pub Date: July 1960 DOI: 10.1086/146896 Bibcode: 1960ApJ...132...30B full text sources ADS | data products SIMBAD (2) NED (2) Related Materials (6) Part 2: 1960ApJ...132..654B Part 3: 1960ApJ...132..661B Part 4: 1962ApJ...136..119B Part 5: 1962ApJ...136..704B Part 6: 1964ApJ...140...85B Part 7: 1964ApJ...140...94R
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