The ACS fornax cluster survey. VIII. the luminosity function of globular clusters in Virgo and fornax early-type galaxies and its use as a distance indicator

Daniela Villegas, Andrés Jordn, Eric W. Peng, John P. Blakeslee, Patrick Cté, Laura Ferrarese, Markus Kissler-Patig, Simona Mei, Leopoldo Infante, John L. Tonry, Michael J. West

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

We use a highly homogeneous set of data from 132 early-type galaxies in the Virgo and Fornax clusters in order to study the properties of the globular cluster luminosity function (GCLF). The globular cluster system of each galaxy was studied using a maximum likelihood approach to model the intrinsic GCLF after accounting for contamination and completeness effects. The results presented here update our Virgo measurements and confirm our previous results showing a tight correlation between the dispersion of the GCLF and the absolute magnitude of the parent galaxy. Regarding the use of the GCLF as a standard candle, we have found that the relative distance modulus between the Virgo and Fornax clusters is systematically lower than the one derived by other distance estimators, and in particular, it is 0.22mag lower than the value derived from surface brightness fluctuation measurements performed on the same data. From numerical simulations aimed at reproducing the observed dispersion of the value of the turnover magnitude in each galaxy cluster we estimate an intrinsic dispersion on this parameter of 0.21mag and 0.15mag for Virgo and Fornax, respectively. All in all, our study shows that the GCLF properties vary systematically with galaxy mass showing no evidence for a dichotomy between giant and dwarf early-type galaxies. These properties may be influenced by the cluster environment as suggested by cosmological simulations.

Original languageEnglish
Pages (from-to)603-616
Number of pages14
JournalAstrophysical Journal
Volume717
Issue number2
DOIs
StatePublished - 2010
Externally publishedYes

Keywords

  • galaxies: elliptical and lenticular, cD
  • galaxies: star clusters: general
  • globular clusters: general

Fingerprint

Dive into the research topics of 'The ACS fornax cluster survey. VIII. the luminosity function of globular clusters in Virgo and fornax early-type galaxies and its use as a distance indicator'. Together they form a unique fingerprint.

Cite this