Sampling effects in the emission-line spectra of Hii regions

Villaverde, M.; Luridiana, V.; Cerviño, M.

doi:10.1007/s10509-009-0096-5

Cited by 1 publication

(2 citation statements)

References 13 publications

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“…of the complexes but only particular information that is dominated by a few individual objects (Villaverde et al 2009). …”

Section: Discussionmentioning

confidence: 99%

“…The fact, however, that this scatter is symmetric throughout the range of cluster mass relevant for our study means that these particular stochasticity effects will more or less cancel out when the cluster masses are added up for the computation of Γ (i.e., about half of our clusters will have their mass overestimated and half will have it underestimated). Further modelling of star cluster complexes and its dependence on the sampling of their mass function are beyond the limits of the data since we are affected by sampling effects and therefore we have no access to global information of the complexes but only particular information which is dominated by few individual objects (Villaverde et al 2009).…”

Section: Fraction Of Recent Star Formation Occurring In Clustersmentioning

confidence: 99%

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A Starburst in the Core of a Galaxy Cluster: The Dwarf Irregular NGC 1427a in Fornax

Mora

Chanamé

Puzia

2015

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Gas-rich galaxies in dense environments such as galaxy clusters and massive groups are affected by a number of possible types of interactions with the cluster environment, which make their evolution radically different than that of field galaxies. The dwarf irregular galaxy NGC 1427A, presently infalling toward the core of the Fornax galaxy cluster for the first time, offers a unique opportunity to study those processes at a level of detail not possible to achieve for galaxies at higher redshifts, when galaxy-scale interactions were more common. Using the spatial resolution of the Hubble Space Telescope/Advanced Camera for Surveys and auxiliary Very Large Telescope/ FORS1 ground-based observations, we study the properties of the most recent episodes of star formation in this gas-rich galaxy, the only one of its type near the core of the Fornax cluster. We study the structural and photometric properties of young star cluster complexes in NGC 1427A, identifying 12 bright such complexes with exceptionally blue colors. The comparison of our broadband near-UV/optical photometry with simple stellar population models yields ages below~4 10 6 years and stellar masses from a few 1000 up to~´ M 3 10 4 , slightly dependent on the assumption of cluster metallicity and initial mass function. Their grouping is consistent with hierarchical and fractal star cluster formation. We use deep Hα imaging data to determine the current star formation rate in NGC 1427A and estimate the ratio, Γ, of star formation occurring in these star cluster complexes to that in the entire galaxy. We find Γ to be among the largest such values available in the literature, consistent with starburst galaxies. Thus a large fraction of the current star formation in NGC 1427A is occurring in star clusters, with the peculiar spatial arrangement of such complexes strongly hinting at the possibility that the starburst is being triggered by the passage of the galaxy through the cluster environment.

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“…of the complexes but only particular information that is dominated by a few individual objects (Villaverde et al 2009). …”

Section: Discussionmentioning

confidence: 99%

Section: Fraction Of Recent Star Formation Occurring In Clustersmentioning

confidence: 99%