Buchumschlag

STEP survey: II. Structural analysis of 170 star clusters in the SMC

We derived surface brightness profiles in the g band for 170 Small Magellanic Cloud (SMC) star clusters (SCs) mainly located in the central region of the galaxy. We provide a set of homogeneous structural parameters obtained by fitting Elson-Fall-Freeman and King models. Through a careful analysis o...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: Gatto, Massimiliano (VerfasserIn) , Ripepi, V (VerfasserIn) , Bellazzini, M (VerfasserIn) , Tosi, M (VerfasserIn) , Cignoni, M (VerfasserIn) , Tortora, C (VerfasserIn) , Leccia, S (VerfasserIn) , Clementini, G (VerfasserIn) , Grebel, Eva K. (VerfasserIn) , Longo, G (VerfasserIn) , Marconi, M (VerfasserIn) , Musella, I (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2021 August 10
In: Monthly notices of the Royal Astronomical Society
Year: 2021, Jahrgang: 507, Heft: 3, Pages: 3312-3330
ISSN:1365-2966
DOI:10.1093/mnras/stab2297
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stab2297
Volltext
Verfasserangaben:M. Gatto, V. Ripepi, M. Bellazzini, M. Tosi, M. Cignoni, C. Tortora, S. Leccia, G. Clementini, E.K. Grebel, G. Longo, M. Marconi and I. Musella
Beschreibung
Zusammenfassung:We derived surface brightness profiles in the g band for 170 Small Magellanic Cloud (SMC) star clusters (SCs) mainly located in the central region of the galaxy. We provide a set of homogeneous structural parameters obtained by fitting Elson-Fall-Freeman and King models. Through a careful analysis of their colour-magnitude diagrams we also supply the ages for a subsample of 134 SCs. For the first time, such a large sample of SCs in the SMC is homogeneously characterized in terms of their sizes, luminosities, and masses, widening the probed region of the parameter space, down to hundreds of solar masses. We used these data to explore the evolution of the SC’s structural parameters with time. In particular, we confirm the existence of a physical mechanism that induces an increase of the core radius after 0.3-1.0 Gyr. We suggest that cluster mass could be the main parameter driving the inner expansion, as none of the SCs having log (M/M⊙) ≤ 3.5 dex analysed in this work undergoes to such an expansion. We also detected a mass-size relationship almost over the entire range of SCs masses investigated here. Finally, our data suggest that globally the SMC SC system is dynamically evolved.
Beschreibung:Gesehen am 24.12.2021
Beschreibung:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stab2297

Ähnliche Einträge