Astronomy and Astrophysics, volume 442, 85-95 (2005/10-4)
Hubble Space Telescope imaging of globular cluster candidates in low surface brightness dwarf galaxies.
SHARINA M.E., PUZIA T.H. and MAKAROV D.I.
Abstract (from CDS):
Fifty-seven nearby low surface brightness dwarf galaxies (-10>MV>-16) were searched for globular cluster candidates (GCCs) using Hubble Space Telescope WFPC2 imaging in V and I. The sample consists of 18 dwarf spheroidal (dSph), 36 irregular (dIrr), and 3 ``transition'' type (dIrr/dSph) galaxies with angular sizes less than 3.7kpc situated at distances 2-6Mpc in the field and in the nearby groups: M 81, Centaurus A, Sculptor, Canes Venatici I cloud. We find that ∼50% of dSph, dIrr/dSph, and dIrr galaxies contain GCCs. The fraction of GCCs located near the center of dwarf spheroidal galaxies is >2 times higher than for dIrrs. The mean integral color of GCCs in dSphs, (V-I)0=1.04±0.16mag, coincides with the corresponding value for Galactic globular clusters and is similar to the blue globular cluster sub-populations in massive early-type galaxies. The color distribution for GCCs in dIrrs shows a clear bimodality with peaks near (V-I)0=0.5 and 1.0mag. Blue GCCs are presumably young with ages t≲1Gyr, while the red GCC population is likely to be older. The detected GCCs have absolute visual magnitudes between MV=-10 and -5mag. We find indications for an excess population of faint GCCs with MV>-6.5mag in both dSph and dIrr galaxies, reminiscent of excess populations of faint globular clusters in nearby Local Group spiral galaxies. The measurement of structural parameters using King-profile fitting reveals that most GCCs have structural parameters similar to extended outer halo globular clusters in the Milky Way and M 31, as well as the recently discovered population of ``faint fuzzy'' clusters in nearby lenticular galaxies.
galaxies: dwarf - galaxies: star clusters
VizieR on-line data:
<Available at CDS (J/A+A/442/85): table1.dat table2.dat table3.dat>
Table 2: [SPM2005] DDONNN-N-NNNN, [SPM2005] BK3N-N-NNN, [SPM2005] BK6N-N-NNN, [SPM2005] KKNNN-N-NNNN, [SPM2005] KDGNNN-N-NNNN, [SPM2005] Garland-N-NNN, [SPM2005] HoIX-N-NNNN, [SPM2005] ENNN-NNN-N-NNNN, [SPM2005] Sc22-N-NNN, [SPM2005] UNNNN-N-NNNN, [SPM2005] UA438-N-NNNN, N=105.
Table 1 E 470-18 is a probable misprint for ESO 407-18.
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