J/MNRAS/478/784 Age estimates of SMC clusters (Piatti, 2018)
Towards a comprehensive knowledge of the star cluster population in the
Small Magellanic Cloud.
Piatti A.E.
<Mon. Not. R. Astron. Soc., 478, 784-790 (2018)>
=2018MNRAS.478..784P 2018MNRAS.478..784P (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Stars, ages
Keywords: techniques: photometric - galaxies: individual: SMC -
galaxies: star clusters: general
Abstract:
The Small Magellanic Cloud (SMC) has recently been found to harbour an
increase of more than 200 per cent in its known cluster population.
Here, we provide solid evidence that this unprecedented number of
clusters could be greatly overestimated. On the one hand, the fully
automatic procedure used to identify such an enormous cluster
candidate sample did not recover ∼50 per cent, on average, of the
known relatively bright clusters located in the SMC main body. On the
other hand, the number of new cluster candidates per time unit as a
function of time is noticeably different from the intrinsic SMC
cluster frequency (CF), which should not be the case if these new
detections were genuine physical systems. We found additionally that
the SMC CF varies spatially, in such a way that it resembles an
outside-in process coupled with the effects of a relatively recent
interaction with the Large Magellanic Cloud. By assuming that clusters
and field stars share the same formation history, we showed for the
first time that the cluster dissolution rate also depends on position
in the galaxy. The cluster dissolution becomes higher as the
concentration of galaxy mass increases or if external tidal forces are
present.
Description:
Age estimates of 419 SMC clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 46 419 Age estimates of SMC clusters
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See also:
J/ApJS/101/41 : SMC and Bridge extended catalog (Bica+ 1995)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 33 A33 --- Name Cluster name
35- 38 F4.2 [Gyr] logAge Age
41- 44 F4.2 [Gyr] e_logAge rms uncertainty on logAge
46 I1 --- N Number of age values used
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Jun-2021