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The nature of the 8 o'clock arc using Near-IR IFU spectroscopy with SINFONI

Published online by Cambridge University Press:  17 July 2013

M. Shirazi ,
S. Vegetti ,
N. Nesvadba ,
J. Brinchmann ,
S. Allam  and
D. Tucker
M. Shirazi
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands email: [email protected]
S. Vegetti
Affiliation:
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
N. Nesvadba
Affiliation:
Institut d'Astrophysique Spatiale, UMR 8617, CNRS, Université Paris-Sud, Bâtiment 121, 91405, Orsay Cedex, France
J. Brinchmann
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands email: [email protected]
S. Allam
Affiliation:
Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA
D. Tucker
Affiliation:
Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA
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We present an analysis of the lensed Lyman Break Galaxy (LBG), the 8 o'clock arc, at redshift 2.735. We reduced Near-IR IFU data from SINFONI on VLT covering λ= 2900 Å to 6500 Å in the rest-frame. From this we recovered the Hβ map and the spatially-resolved Hβ profile which are shown in the right plot in Fig. 1. We can see that Hβ shows different profiles at different spatial pixels and it is composed of multiple components. To study the de-lensed morphology of the galaxy we make use of existing B & H band imaging from the HST. Based on this we constructed a rigorous lens model for the system using the Bayesian grid based lens modeling technique presented by Vegetti & Koopmans (2009, MNRAS, 392, 945). In order to obtain a robust lens model, we first considered the high resolution B band HST image (rest-frame UV, left plot in Fig. 1) and then used this modeling to reconstruct the Hβ line map of the galaxy. We then present the de-lensed Hβ line map, velocity and velocity dispersion maps of this LBG galaxy.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 63
Copyright
Copyright © International Astronomical Union 2013