Journal
ASTRONOMY & ASTROPHYSICS
Volume 463, Issue 2, Pages 503-512Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20066300
Keywords
galaxies : clusters : individual : Fornax cluster; galaxies : dwarf; galaxies : fundamental parameters galaxies :; luminosity function, mass function; techniques : photometric
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [01/07342-7] Funding Source: FAPESP
Ask authors/readers for more resources
Aims. We analyse the photometric properties of the early-type Fornax cluster dwarf-galaxy population (M-V > - 17 mag), based on a wide-field imaging study of the central cluster area in V and I bandpasses. We used the instrument/telescope combination IMACS/Magellan at Las Campanas Observatory, providing much larger light-collecting area and better image resolution than previous wide-field imaging surveys. Methods. We created a fiducial sample of Fornax cluster dwarf ellipticals (dEs) in the following three steps. (1) To verify cluster membership, we measured I-band surface brightness fluctuations (SBF) distances to candidate dEs known from previous surveys. (2) We re-assessed morphological classifications for those candidate dEs that are too faint for SBF detection. (3) We searched for new candidate dEs in the size-luminosity regime close to the resolution limit of previous surveys. Results. (1) We confirm cluster membership for 28 candidate dEs in the range - 16.6 < M-V < - 10.1 mag by means of SBF measurement. We find no SBF background galaxy. (2) Of 51 other candidate dEs in the range - 13.2 < M-V < - 8.6 mag, 2/3 are confirmed as probable cluster members by morphological re-assessment, while 1/3 are re-classified as probable background objects. (3) We find 12 new dE candidates in the range - 12.3 < MV < - 8.8 mag, two of which are directly confirmed via SBF measurement. The resulting fiducial dE sample follows a well-defined surface brightness-magnitude relation, showing that Fornax dEs are about 40% larger than Local Group dEs. The sample also defines a colour-magnitude relation that appears slightly shallower than that of Local Group dEs. The early-type dwarf galaxy luminosity function in Fornax has a very flat faint end slope alpha similar or equal to - 1.1 +/- 0.1. We discuss these findings in the context of structure-formation theories. Conclusions. The SBF method is a very powerful tool to help constrain the faint end of the galaxy luminosity function in nearby galaxy clusters. For the Fornax cluster, morphological cluster memberships - if performed at sufficient resolution - are very reliable.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available