Volume 503, Number 1, August III 2009
|Page(s)||87 - 101|
|Published online||22 June 2009|
The star cluster population of the spiral galaxy NGC 3370*
INAF-Osservatorio Astronomico di Teramo, via M. Maggini snc, 64100 Teramo, Italy e-mail: [cantiello;brocato]@oa-teramo.inaf.it
2 Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 W. Saanich Rd, Victoria, BC V9E 2E7, Canada e-mail: email@example.com
Accepted: 10 June 2009
Aims. We study the photometric and structural properties of the star cluster system in the late type Sc spiral NGC 3370.
Methods. BVI observations from the Advanced Camera for Surveys on board of HST are used to analyse in detail the colours, magnitudes and spatial properties of cluster candidates. The final catalogue of sources used for the study is composed by 277 objects.
Results. The colour distributions of cluster candidates appear multi-modal. Although firm age constraints need the use of more age-sensitive indicators, the comparison of cluster candidate colours with the colours of Galactic and Magellanic Clouds star clusters, suggests an age difference between the various sub-peaks, with a red old sub-system, a rich population of intermediate age (~1 Gyr), and a blue tail of very young (below ~100 Myr) clusters. The luminosity functions appear normal for this type of galaxy, as for the distribution of cluster effective radii . Our analysis suggests the presence of a peak in the distribution at ~3.0 pc, with blue (likely young) cluster candidates showing smaller radii respect to red (likely old) objects. Finally, inspecting the properties of candidate globular clusters, we find a colour distribution matching with Galactic Globulars, with a median [Fe/H] ~ -1.5 dex, though a non negligible tail towards lower metallicities is also present.
Key words: galaxies: individual: NGC 3370 / galaxies: star clusters
© ESO, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.