The globular cluster systems of Abell 1185

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Journal titleAstronomy and Astrophysics
IssueApril 2011
Article numberA115
PagesA115-1A115-13; # of pages: 13
Subjectgalaxies: elliptical and lenticular; cD; galaxies: formation; galaxies: interactions; globular clusters: general; galaxies: clusters: individual: Abell 1185
AbstractWe examine the properties of a previously discovered population of globular clusters in the heart of the rich galaxy cluster Abell 1185 that might be intergalactic in nature. Deep images obtained with the Advanced Camera for Surveys (ACS) aboard Hubble Space Telescope (HST) confirm the presence of similar to 1300 globular clusters brighter than I(F814W) similar or equal to 27.3 mag in a field devoid of any large galaxies. The luminosities and colors of these objects are found to be similar to those of metal-poor globular clusters observed in many galaxies to date. Although a significant fraction of the detected globular clusters undoubtedly reside in the outer halos of galaxies adjacent to this field, detailed modeling of their distribution suggests that the majority of these objects are likely to be intergalactic, in the sense that they are not gravitationally bound to any individual galaxy. We conclude that the true nature and origin of the globular cluster population in the core of A1185 - galactic residents or intergalactic wanderers - remains uncertain, and suggest how future observation could resolve this ambiguity.
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AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19800865
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Record identifier3ecdea79-d2dc-4798-ad21-a1fe42f8fb20
Record created2012-04-12
Record modified2016-05-09
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