Evidence for unusual dynamical effects in the halo of NGC 5128 (Centaurus A)

Details Evidence for unusual dynamical effects in the halo of NGC 5128 (Centaurus A) Evidence for unusual dynamical effects in the halo of NGC 5128 (Centaurus A)

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303l..51h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 303, April 15, 1986, p. L51-L55. NSERC-supported re

Astronomy and Astrophysics

Astrophysics

36

Elliptical Galaxies, Globular Clusters, Stellar Motions, Astronomical Spectroscopy, Radial Velocity, Velocity Distribution

Scientific paper

New observations bring to 35 the number of spectroscopically confirmed globular clusters in NGC 5128. At radii less than about 11 arcmin the ensemble-average cluster velocity appears to exceed by about 4 simga the systemic velocity of the galaxy, while at larger radii the two values agree. Several sources of possible systematic error are eliminated by the new data, suggesting that this peculiar result is not likely to have arisen from a statistical fluctuation. These inner clusters lie beyond the obvious bulge light but within the faintest outer isophotes, and generally have redder colors than more distant ones. It is suggested that whatever phenomenon produced the warped dust lane and/or the faint optical 'shells' around NGC 5128 may also be related to the unexpected cluster velocities. If the phenomenon involved a merger, the cluster velocity observations would appear to suggest that the last merger occurred more recently than a dynamical crossing time.

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