SIMBAD references

2002A&A...385...21K - Astronomy and Astrophysics, volume 385, 21-31 (2002/4-1)

New distances to galaxies in the Centaurus A group.

KARACHENTSEV I.D., SHARINA M.E., DOLPHIN A.E., GREBEL E.K., GEISLER D., GUHATHAKURTA P., HODGE P.W., KARACHENTSEVA V.E., SARAJEDINI A. and SEITZER P.

Abstract (from CDS):

We present Hubble Space Telescope/WFPC2 images of seventeen dwarf galaxies in the Centaurus A group. Their distances derived from the magnitudes of the tip of the red giant branch are 5.2Mpc (KK112), 3.2Mpc (ESO 321-014), 3.5Mpc (KK179), 3.4Mpc (NGC 5102), 4.6Mpc (KK200), 3.7Mpc (ESO 324-024), 4.7Mpc (KK208), 4.6Mpc (ESO 444-084), 4.4Mpc (IC 4316), 4.5Mpc (NGC 5264), 3.6Mpc (KK211), 3.6Mpc (KK213), 3.4Mpc (ESO 325-011), 3.8Mpc (KK217), 4.0Mpc (KK221), 4.8Mpc (NGC 5408), and 3.6Mpc (PGC 51659). The galaxies are concentrated in two spatially separated groups around NGC 5128 = Cen A and NGC 5236 = M 83. The Cen A group itself has a mean distance of 3.63±0.07Mpc, a velocity dispersion of 89km/s, a mean projected radius of 263kpc, an estimated orbital mass of 2.1x1012M, and an orbital mass-to-blue luminosity ratio of 64M/L. For the M 83 group we derived a mean distance of 4.57±0.05Mpc, a velocity dispersion of 62km/s, a mean projected radius of 142kpc, an estimated orbital mass of 0.8x1012M, and Morb/LB=37M/L. The M 83 group moves away from the Cen A group, which yields a radius of the zero-velocity surface of the Cen A group of R0<1.26Mpc. The total mass within R0, M0<2.7x1012M, agrees with the orbital mass estimate. The centroids of both the groups have very small peculiar velocities, (+18±24)km/s (Cen A) and (-17±27)km/s (M 83) with respect to the local Hubble flow with H0=70km/s/Mpc.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: distances and redshifts - galaxies: general

CDS comments: Table 2 : HIPASSa=[K99b] HIPASS J1337-39, HIPASSb=[K99b] HIPASS J1351-47, HIPASSc=[K99b] HIPASS J1348-37.

Simbad objects: 75

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2021.06.13-05:20:40

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