Two Tails in NGC 3656 and the Major Merger Origin of Shell and Minor-Axis Dust Lane Elliptical Galaxies

Bibcode
1997ApJ...486L..87B
DOI
10.1086/310854
Balcells, Marc
Bibliographical reference

Astrophysical Journal Letters v.486, p.L87

Advertised on:
9
1997
Number of authors
1
IAC number of authors
1
Citations
24
Refereed citations
20
Description
I report on the discovery of two faint (~26.8 R mag arcsec-2) tidal tails around the shell elliptical galaxy NGC 3656 (Arp 155). This galaxy had previously been interpreted as a case of accretion, or minor merger. The two tidal tails are inconsistent with a minor merger and point instead to a disk-disk major merger origin. NGC 3656 extends Toomre's merger sequence toward normal elliptical galaxies and hints at a major merger origin for shells and minor-axis dust lanes. A dwarf galaxy lies at the tip of one of the tidal tails. A prominent shell, which shows sharp azimuthal color discontinuities, belongs to a rotating dynamical component with young stars that includes the inner dust lane.
Type
Refereed
Galaxies

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