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Does M31 result from an ancient major merger?
F. Hammer, Y. B. Yang, J. L. Wang +3
The numerous streams in the M31 halo are currently assumed to be due to multiple minor mergers. Here we use the GADGET2 simulation code to test whether M31 could have experienced a…
Development of five multifibre links for the OPTIMOS-EVE study for the E-ELT
Isabelle Guinouard, Fanny Chemla, Hector Flores +3
The OPTIMOS-EVE concept provides optical to near-infrared (370-1700 nm) spectroscopy, with three spectral resolution (5000, 15000 and 30000), with high simultaneous multiplex (at l…
A new algorithm for sky extraction for multi-fiber instrument
M. Rodrigues, H. Flores, M. Puech +2
We present a new method to subtract sky light from faint object observations with fiber-fed spectrographs. The algorithm has been developed in the framework of the phase A of OPTIM…
The star formation histories of red and blue low surface brightness disk galaxies
G. H. Zhong, Y. C. Liang, F. Hammer +3
We study the star formation histories (SFH) and stellar populations of 213 red and 226 blue nearly face-on low surface brightness disk galaxies (LSBGs), which are selected from the…
Disentangling the morpho-kinematic properties of a face-on merger at z~0.7
Isaura Fuentes-Carrera, Hector Flores, Yanbin Yang +4
At intermediate redshifts, many galaxies seem to be perturbed or suffering from an interaction. Considering that disk galaxies may have formed and evolved through minor mergers or…
The Wolf-Rayet features and mass-metallicity relation of long-duration gamma-ray burst host galaxies
X. H. Han, F. Hammer, Y. C. Liang +4
Aims. We have gathered optical spectra of 8 long-duration GRB host galaxies selected from the archival data of VLT/FORS2. We investigated whether or not Wolf-Rayet (WR) stars can b…