Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..500m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 3, June 1, 1992, p. 500-514. Research supporte
Astronomy and Astrophysics
Astronomy
18
Astronomical Catalogs, Astronomical Photometry, Elliptical Galaxies, Galactic Bulge, Galactic Structure, Astronomical Spectroscopy, Charge Coupled Devices, Lenticular Bodies
Scientific paper
The paper presents bidimensional photometry for 40 bright S0 galaxies with apparent flattening of not less than 0.9 at the 25-mag/sq arcsec level. They represent all of the bright S0s in the RC2 catalog which are seen almost face-on. Ellipticity and PA profiles of each system were analyzed in order to test for the presence of triaxiality in their bulges and in their disks. Many of these systems are found to be quite far from face-on orientation, at inclination not less than 20 deg. About 45 percent are barred; 67 percent of the bulges of the unbarred S0s considered show twisting of the isophotes and appear to be triaxial, or dominated by a triaxial component following the r exp 1/4 law. About half of the disks exhibit the same behavior, suggesting a slight triaxiality. Some oblate disks are found. Disks of barred and unbarred systems do not appear to differ much. Two galaxies of the present sample, and possibly two more from the literature, show no indications of stellar streaming which is not coplanar with the galaxy plane.
Bettoni Daniela
Galletta Giuseppe
Magrelli G.
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