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Searching Gaia for extended structure in Globular Clusters

Published online by Cambridge University Press:  11 March 2020

Pete B. Kuzma Open the ORCID record for Pete B. Kuzma [Opens in a new window] ,
Annette M. N. Ferguson Open the ORCID record for Annette M. N. Ferguson [Opens in a new window]  and
Jorge Peñarrubia
Pete B. Kuzma
Affiliation:
Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, Scotland, EH9 3HJ email: pbkuzma@roe.ac.uk
Annette M. N. Ferguson
Affiliation:
Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, Scotland, EH9 3HJ email: pbkuzma@roe.ac.uk
Jorge Peñarrubia
Affiliation:
Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, Scotland, EH9 3HJ email: pbkuzma@roe.ac.uk
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Abstract

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A growing number of studies are revealing that many Milky Way globular clusters possess extended stellar structures beyond their traditional boundaries. Just how ubiquitous these structures are, and how they originate, are key questions to explore. In this contribution, we present a Bayesian technique that we have developed to separate probable members of globular clusters from the dominant Milky Way fore/background at large clustercentric radii and hence facilitate quantitative analyses of these intriguing structures. We demonstrate the promise of our method by showing how it recovers the known extended features around Palomar 5 and NGC 7089.

Keywords

globular clusters: generalglobular clusters: individual (NGC 7089, Palomar 5)Galaxy: halosurveys

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