Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5206s&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #52.06; Bulletin of the American Astronomical Society, Vol. 26, p.1398
Astronomy and Astrophysics
Astronomy
Scientific paper
We have measured the stellar (absorption line) rotation of the elliptical galaxy NGC 1700 along four position angles, to very large radii, using the MMT. Our data extend the coverage of the stellar velocity field by a factor of 5 (2.5 times further in radius and twice as many PAs) beyond previous work. We have attained 10 kms(-1) accuracy in the mean velocity V out to nearly 2 effective radii (r_e), and errors are <15% of the maximum rotation speed out to nearly 3r_e. We confirm the previously known counterrotating core, and also find that the velocity distribution is slightly square-shouldered and skewed in the direction of rotation. The lack of detectable minor-axis rotation and the nearly identical kinematics on the +/- 45(deg) PAs, combined with extensive dynamical modeling, strongly indicate that NGC 1700 is nearly oblate. The dynamically inferred shapes of NGC 1700, NGC 3379, and NGC 4589 are not consistent with the preference for prolate-triaxial objects in current galaxy formation simulations, implying that the shapes of ellipticals may be significantly modified by dissipative processes.
Cecil Gerald
Smecker-Hane Tammy
Statler Thomas S.
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