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For refcode 1997AJ....113..895P:
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1997AJ....113..895P THE GLOBULAR CLUSTER SYSTEMS OF NGC 1400 AND NGC 1407 KATHRYN M. PERRETT, DAVID A. HANES, STEVEN T. BUTTERWORTH, AND JJ KAVELAARS Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada Electronic mall: perrett@astro.queensu.ca, hanes@astro.queensu.ca, bworth@astro.queensu.ca, ltauelaar@astro.queensu.ca DOUG GEISLER Kitt Peak National Observatory, National Optical Astronomy Observatories, P.O. Box 26732, Tucson, Arizona 85726 Electronic mall: doug@noao.edu WILLIAM E. HARRIS Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada Electronic mail: harris@azalea.physics.mcmaster.ca Received 1996 October 30; revised 1996 December 9 ABSTRACT The two brightest elliptical galaxies in the Eridanus A group, NGC 1400 and NGC 1407, have been observed in both the Washington T_1_ and Kron- Cousins I filters to obtain photometry of their globular cluster systems (GCSs). This group of galaxies is of particular interest due to its exceptionally high M/L value, previously estimated at ~3000h, making this cluster highly dark-matter-dominated [Gould, ApJ. 403,37(1993)], NGC 1400's radial velocity (549 km/s) is extremely low compared to that of the central galaxy of Eridanus A (NGC 1407 with _sun_ = 1766 km/s) and the other members of the system, suggesting that it is a foreground galaxy projected by chance onto the cluster, Using the shapes of the globular cluster luminosity functions, however, we derive distances of 17.6+/-3.1 Mpc to NGC 1407 and 25.4+/-7.0 Mpc to NGC 1400. These results support earlier conclusions that NGC 1400 is at the distance of Eridanus A and therefore has a large peculiar velocity. Specific frequencies are also derived for these galaxies, yielding values of S_N_ = 4.0+/-1.3 for NGC 1407 and S_N_ = 5.2+/-2.0 for NGC 1400. In this and other respects, these two galaxies have GCSs which are consistent with those observed in other galaxies.
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