The 'normal' elliptical galaxy NGC 3640 - A merger in progress?

Details The 'normal' elliptical galaxy NGC 3640 - A merger in progress? The 'normal' elliptical galaxy NGC 3640 - A merger in progress?

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204...61p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 61-67.

Astronomy and Astrophysics

Astrophysics

10

Elliptical Galaxies, Galactic Rotation, Galactic Structure, Astronomical Spectroscopy, Isophotes

Scientific paper

A photometric analysis reveals that NGC 3640 is a normal elliptical r exp 1/4 galaxy with boxy isophotes, a minor-axis dust lane, and patchy shell-like features. Long-slit spectroscopy shows that it is a fast rotator along its major axis. No rotation is found along the minor axis. It is shown that NGC 3640 is a triaxial galaxy for the same reasons as, e.g., NGC 5128. The meaning of these characteristics are discussed and it is argued that NGC 3640 is a merger in progress that does not involve the compact companion NGC 3641, and at a more advanced stage of relaxation toward an elliptical than prototypes of merger products such as NGC 1316, 5018, 5128 or 7252. The galaxy involved in the merging probably is a gas-poor disk system.

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