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26 April 2024 |
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Extremely massive young clusters in NGC1365 | | E. Galliano
; D. Alloin
; E. Pantin
; G.L. Granato
; P. Delva
; L. Silva
; P.O. Lagage
; P. Panuzzo
; | | Date: |
21 Jul 2008 | | Abstract: | In a previous work, three bright MIR/radio sources were discovered in the
nuclear region of NGC1365. We here confirm that these sources are young and
massive ’’embedded’’ clusters, and derive their parameters, such as extinction,
age and mass. Using ISAAC and VISIR at the VLT we obtained NIR and MIR maps and
LR spectra. The dataset is first interpreted by comparing the observations with
images and spectra of the close-by young cluster R136 in the LMC and then by
using model predictions for both the nebular emission lines and the spectral
energy distribution of the sources. We produce maps of the region containing
the three sources in the R, J, Ks, L’ bands and at 12.8micro. We also provide
spectra in K, L and N. The spectral energy distribution of the three sources
rises with wavelength. Emission lines from ionised hydrogen and molecular
hydrogen are detected, as well as PAH emission. Conspicuous [NeII]12.8 line is
also present, while neither the [ArIII] 8.9 nor the [SIV] 10.4 lines are
detected. This provides a stringent constraint on the age of the sources: they
are relatively evolved young clusters (6-8 Myr). Owing to their ionising photon
rates and ages, they must be extremely massive clusters (around 10^7 solar
masses). Their MIR spectral energy distribution suggests the presence of two
components: (1) an optically thin component, with a continuum comparable to
that of R136, and (2) an optically thick component which might be related to
subsequent or on-going episodes of star formation. These sources are good
candidates for evolving according to a bi-modal hydrodynamical regime, in which
matter is trapped at the centre of a compact and massive cluster. | | Source: | arXiv, 0807.3335 | | Services: | Forum | Review | PDF | Favorites | |
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