A new compact elliptical galaxy in the Antlia cluster confirmed through GEMINI-GMOS spectroscopy

SIMTH CASTELLI, A. V.; FAIFER, F.; BASSINO, L. P.; RICHTLER, T.; CELLONE, S. A.

Bonn, Alemania

Workshop; Tidal Dwarf Galaxies: Ghosts from structure formation; 2009

Argelander-Institut für Astronomie

Spectroscopic data were obtained in 2009 March 19-22 with the Gemini Multi-Object Spectrograph (GMOS) mounted on the Gemini-South telescope (program ID: GS-2009A-Q-25, PI: L. Bassino). The B600 G5303 grating blazed at 5000 Å was used, with three different central wavelengths (5000, 5050 and 5100 Å) in order to fill in the CCD gaps. A slit width of 1 arcsec was used in an average seeing of 0.5 - 0.6 arcsec. For FS90 110, we have calculated a radial velocity of 2900 km/s, confirming its membership to Antlia. This is the seventh cE galaxy confirmed up to now. It has a projected diameter size of 4.8 kpc, <mu_eff>=18.4 mag arcsec-2 (R band), MR=-17.2 mag, and it is located at a projected distance of ~8 kpc from NGC 3258. It is the only cE showing clear evidence of interaction with its bright companion.