A WFC3 study of globular clusters in NGC 4150: an early-type minor merger

Autor:	R. Mark Crockett, Marina Rejkuba, Daniela Calzetti, Robert W. O'Connell, Joseph Silk, Bradley C. Whitmore, Rogier A. Windhorst, Jay A. Frogel, Sukyoung K. Yi, Sugata Kaviraj, Max Mutchler
Rok vydání:	2012
Předmět:	Physics education.field_of_study Star formation Population Astronomy and Astrophysics Astrophysics Galaxy Early type Photometry (astronomy) Space and Planetary Science Globular cluster Cluster (physics) education Wide Field Camera 3
Zdroj:	Monthly Notices of the Royal Astronomical Society: Letters. 422:L96-L100
ISSN:	1745-3925
DOI:	10.1111/j.1745-3933.2012.01246.x
Popis:	We combine near-ultraviolet (NUV; 2250 A) and optical (U, B, V, I) imaging from the Wide Field Camera 3 (WFC3), on board the Hubble Space Telescope (HST), to study the globular cluster (GC) population in NGC 4150, a sub-L* (M_B ~ -18.48 mag) early-type minor-merger remnant in the Coma I cloud. We use broadband NUV-optical photometry from the WFC3 to estimate individual ages, metallicities, masses and line-of-sight extinctions [E_(B-V)] for 63 bright (M_V 0.3 ZSun) clusters that have formed within the last Gyr and reside in relatively dusty (E_(B-V) > 0.3 mag) regions that are coincident with the part of the galaxy core that hosts significant recent star formation. Cluster disruption models (in which ~80-90% of objects younger than a few 10^8 yr dissolve every dex in time) suggest that the bulk of these young clusters are a transient population.
Databáze:	OpenAIRE
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