Other
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.7116p&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #71.16; Bulletin of the American Astronomical Society, Vol. 28, p.1365
Other
1
Scientific paper
Photometric observations of the globular cluster systems of the two brightest elliptical galaxies in the Eridanus A sub-cluster, NGC 1400 and NGC 1407, have been obtained in the Washington T_1 and Kron-Cousins I filters. The M/L value for Eridanus A appears to be exceptionally high, previously estimated at ~ 3000h, suggesting that this cluster is highly dominated by dark matter. NGC 1400's radial velocity, 549 km/s, is extremely low compared to that of the central galaxy (NGC 1407, v_sun=1766 km/s) and the other members of Eridanus A, implying that it is a foreground galaxy projected by chance onto the cluster. Using the observed shapes of the globular cluster luminosity functions, we obtain distances of 17.6 +/- 3.1 Mpc to NGC 1407 and 25.4 +/- 7.0 Mpc to NGC 1400, supporting earlier conclusions that NGC 1400 is at the distance of Eridanus A and therefore has a large peculiar velocity. We derive specific frequencies of S_N=4.0 +/- 1.3 and S_N = 5.2 +/- 2.0 for NGC 1407 and NGC 1400 respectively, using an adopted distance to the cluster of 20.5 +/- 1.2 Mpc based on the mean recessional velocity of the cluster members and H_0=80 km s(-1) Mpc(-1) .
Butterworth Steven T.
Geisler Doug
Hanes David A.
Harris William E.
Kavelaars John J.
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