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Cluster 77 in NGC 4449: The nucleus of a satellite galaxy being transformed into a globular cluster?
Francesca Annibali, Monica Tosi, Alessandra Aloisi +2
We report the discovery in our HST ACS B, V, and I images of NGC 4449 of a globular cluster (GC) which appears associated with two tails of blue stars. The cluster is massive (M~1.…
The cluster population of the irregular galaxy NGC 4449 as seen by the Hubble Advanced Camera for Surveys
Francesca Annibali, Monica Tosi, Alessandra Aloisi +1
We present a study of the star cluster population in the starburst irregular galaxy NGC 4449 based on B, V, I, and Ha images taken with the Advanced Camera for Surveys on the Hubbl…
Spatial distribution and evolution of the stellar populations and candidate star clusters in the Blue Compact Dwarf I Zwicky 18
R. Contreras Ramos, F. Annibali, G. Fiorentino +7
The evolutionary properties and spatial distribution of I Zwicky 18 stellar populations are analyzed by means of HST/ACS deep and accurate photometry. The comparison of the resulti…
Hubble Space Telescope study of resolved red giant stars in the outer halos of nearby dwarf starburst galaxies
Agnieszka Ryś, Aaron J. Grocholski, Roeland P. van der Marel +2
[abridged] Aims. We observed the outer parts of NGC 1569 and NGC 4449, two of the closest and strongest dwarf starburst galaxies in the local universe, to characterize their stella…