ISAAC/VLT observations of a lensed galaxy at z = 10.0

R. Pelló; D. Schaerer; J. Richard; J.-F. Le Borgne; J.-P. Kneib

doi:10.1051/0004-6361:20040065

Home

All issues

Volume 416 / No 3 (March IV 2004)

A&A, 416 3 (2004) L35-L40

Abstract

Free Access

Issue		A&A Volume 416, Number 3, March IV 2004


Page(s)		L35 - L40
Section		Letters
DOI		https://doi.org/10.1051/0004-6361:20040065
Published online		09 March 2004

A&A 416, L35-L40 (2004)

Letter to the Editor

ISAAC/VLT observations of a lensed galaxy at z = 10.0^*

R. Pelló¹, D. Schaerer²^,1, J. Richard¹, J.-F. Le Borgne¹ and J.-P. Kneib³^,1

¹ Laboratoire d'Astrophysique, UMR 5572, Observatoire Midi-Pyrénées, 14 Avenue E. Belin, 31400 Toulouse, France
² Observatoire de Genève, 51, Ch. des Maillettes, 1290 Sauverny, Switzerland
³ Caltech Astronomy, MC105-24, Pasadena, CA 91125, USA

Corresponding author: R. Pelló, roser@ast.obs-mip.fr

Received: 20 January 2004
Accepted: 13 February 2004

Abstract

We report the first likely spectroscopic confirmation of a $z\sim 10.0$ galaxy from our ongoing search for distant galaxies with ISAAC/VLT. Galaxy candidates at $z \ga 7$ are selected from ultra-deep JHKs images in the core of gravitational lensing clusters for which deep optical imaging is also available, including HST data. The object reported here, found behind Abell 1835, exhibits a faint emission line detected in the J band, leading to $z=10.0$ when identified as Lyα, in excellent agreement with the photometric redshift determination. Redshifts $z < 7$ are very unlikely for various reasons we discuss. The object is located on the critical lines corresponding to $z=9$ to 11. The magnification factor μ ranges from 25 to 100. For this object we estimate ${\it SFR}({\rm Ly}\alpha) \sim (0.8{-}2.2)~M _{\odot}$ yr^-1 and ${\it SFR}({\rm UV}) \sim (47{-}75)~M _{\odot}$ yr^-1, both uncorrected for lensing. The steep UV slope indicates a young object with negligible dust extinction. SED fits with young low-metallicity stellar population models yield (adopting $\mu=25$ ) a lensing corrected stellar mass of $M_\star \sim 8 \times 10^6~M _{\odot}$ , and luminosities of $2 \times 10^{10}~L _{\odot}$ , corresponding to a dark matter halo of a mass of typically $M_{\rm tot} \ga 5 \times 10^8~M _{\odot}$ . In general our observations show that under excellent conditions and using strong gravitational lensing direct observations of galaxies close to the “dark ages” are feasible with ground-based 8-10 m class telescopes.

Key words: galaxies: high-redshift / galaxies: evolution / galaxies: starburst / galaxies: active / infrared: galaxies

^*

Based on observations collected with the ESO VLT-UT1 Antu Telescope (70.A-0355, 271.A-5013), the Hubble Space Telescope (HST) and the CFHT.

© ESO, 2004

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.

ISAAC/VLT observations of a lensed galaxy at z = 10.0*

ISAAC/VLT observations of a lensed galaxy at z = 10.0^*