Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..351l&link_type=abstract
SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present the preliminary results of a long-term project aiming to derive the physical properties of high-redshift lensed galaxies, intrinsically fainter than the Lyman break galaxies (LBG) currently observed in the field. We thus obtained JHK ISAAC/VLT spectra of two z 1.9 low-luminosity lensed galaxies (S2 and A2), located in the core of the lensing cluster AC 114, allowing us to measure with a good signal-to-noise ratio all the brightest rest-frame optical emission lines ([OII]3726,3728; [OIII]4959,5007; and H-alpha) which provides a direct estimation of the SFR. An exhaustive analysis of these spectra shows that S2 and A2 are intrinsically fainter (by 1-2 mag) and less metal-enriched than the LBG population. Moreover, the chemical abundance analysis reveals a very low N/O ratio in S2 comparable to what is observed in Damped Lyman Alpha systems at z 2-3. This result could indicate that we are picking out a galaxy which has only recently condensed out of the intergalactic midium and begun forming stars.
Contini Thierry
Kneib Jean Paul
Le Borgne Jean-Franc
Lemoine-Busserolle Marie
Lidman Chris
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