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The distance and space distribution of bulge globular clusters

Published online by Cambridge University Press:  18 January 2010

Sergio Ortolani
Affiliation:
Dipartimento di Astronomia, University of Padova, Vicolo dell'Osservatorio 2, 35122, Padova, Italy email: sergio.ortolani@unipd.it
Beatriz Barbuy
Affiliation:
Universidade de São Paulo, IAG, Rua do Matao 1226, Cidade Universitaria, São Paulo 05508–900, Brazil email: barbuy@astro.iag.usp.br
Eduardo Bica
Affiliation:
Universidade Federal do Rio Grande do Sul, Departamento de Astronomia CP 15051, RS, Porto Alegre 91501–970, Brazil email: bica@if.ufrgs.br
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Abstract

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We present the distribution of Galactic bulge globular clusters and a method based on simultaneous detection of field and cluster horizontal branches to derive the cluster distances. This method has the advantage of being independent of both reddening and the reddening law, RV = AV/E(BV). The vast majority of clusters projected in the direction of the Galactic bulge are located on the near side of the Galactic Center. Deviations from the reddening law do not seem to be responsible for this peculiarity. We need to introduce a peculiar, steep dependence of the absolute horizontal-branch magnitude with metallicity in the metal-rich regime if we want to reproduce a symmetrical distribution. Instead, if the observed distribution is correct, we expect a rather large number of bulge globular clusters are still to be discovered.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

Barbuy, B., Bica, E., & Ortolani, S. 1998, A&A, 333, 117Google Scholar
McNamara, D. H. 1999, PASP, 111, 489CrossRefGoogle Scholar
Zoccali, E., Hill, V., Lecureur, A., Barbuy, B., Renzini, A., Minniti, D., Gomez, A., & Ortolani, S. 2008, A&A, 486, 177Google Scholar
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