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• W3101427383 abstract "<i>Context. <i/>In a previous paper, we found that globular clusters in our Galaxy lie close to a line in the (log <i>R<i/><sub>e<sub/>, <i>SB<i/><sub>e<sub/>, log <i>σ<i/>) parameter space, with a moderate degree of scatter and remarkable axi-symmetry. This implies that a purely photometric scaling law exists, that can be obtained by projecting this line onto the (log <i>R<i/><sub>e<sub/>, <i>SB<i/><sub>e<sub/>) plane. These photometric quantities are readily available for large samples of clusters, as opposed to stellar velocity dispersion data.<i>Aims. <i/>We study a sample of <i>129<i/> Galactic and extragalactic clusters on this photometric plane in the <i>V<i/>-band. We search for a linear relation between <i>SB<i/><sub>e<sub/> and log <i>R<i/><sub>e<sub/> and study how the scatter around the best-fit relation is influenced by both age and dynamical environment. We interpret our results in terms of testing the evolutionary versus primordial origin of the fundamental line.<i>Methods. <i/>We perform a detailed analysis of surface brightness profiles, which allows us to present a catalogue of structural properties without relying on a given dynamical model.<i>Results. <i/>We find a linear relation between <i>SB<i/><sub>e<sub/> and log <i>R<i/><sub>e<sub/>, in the form <i>SB<i/><sub>e<sub/> = (5.25 <i>±<i/> 0.44) log <i>R<i/><sub>e<sub/> + (15.58 <i>±<i/> 0.28), where <i>SB<i/><sub>e<sub/> is measured in mag/arcsec<sup>2<sup/> and <i>R<i/><sub>e<sub/> in parsec. Both young and old clusters follow the scaling law, which has a scatter of approximately <i>1<i/> mag in <i>SB<i/><sub>e<sub/>. However, young clusters display more of a scatter and a clear trend in this with age, which old clusters do not. This trend becomes tighter if cluster age is measured in units of the cluster half-light relaxation time. Two-body relaxation therefore plays a major role, together with passive stellar population evolution, in shaping the relation between <i>SB<i/><sub>e<sub/>, log <i>R<i/><sub>e<sub/>, and cluster age. We argue that the log <i>R<i/><sub>e<sub/>-<i>SB<i/><sub>e<sub/> relation and hence the fundamental line scaling law does not have a primordial origin at cluster formation, but is rather the result of a combination of stellar evolution and collisional dynamical evolution." @default.
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• W3101427383 date "2010-03-01" @default.
• W3101427383 modified "2023-09-26" @default.
• W3101427383 title "On the fundamental line of galactic and extragalactic globular clusters" @default.
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• W3101427383 doi "https://doi.org/10.1051/0004-6361/200912947" @default.
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