NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-24 T11:44:33 PDT
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For refcode 1991ApJ...374L..13B:
Retrieve 32 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1991ApJ...374L..13B TRIAXIALITY IN DISK GALAXIES F. BERTOLA Dipartimento di Astronomia dell'Universita di Padova, Vicolo Osservatorio 5,1-35122 Padova, Italy M. VIETRI Osservatorio Astronomico di Roma, Via dell'Osservatorio, 1-00040 Monte Porzio Catone (Roma), Italy AND W. W. ZEILINGER European Southern Observatory, Kari-Schwarzschild Strasse 2, D-80462 Garching, Federal Republic of Germany Received 1990 January 31; accepted 1991 March 27 ABSTRACT Thirty-two bulges of nearby spirals have been observed, to detect misalignment between disk and bulge apparent major axes. Such misalignment is unequivocally present in the majority of observed objects. This may be due to the triaxiality of disks, bulges, or both. The probability distribution function for the axial ratios is derived under the two extreme hypotheses, i.e., that either only disks (case I) or only bulges (case II) are triaxial: our observational data are equally well fitted by either one. Since dynamical evidence and the internal twisting of isophotes show that bulges are triaxial, we think that case I is unlikely, but an intermediate case cannot be ruled out. These distribution functions are compared with available constraints; in particular, that of case II is projected and compared with the distribution of apparent ellipticities of minor-axis dust-lane ellipticals and of all ellipticals. Both tests show that the observed and derived distributions are consistent. Subject headings: galaxies: photometry galaxies: structure
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