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 |
Letter to the Editor
ISAAC/VLT observations of a lensed galaxy at z = 10.0*
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
We report the first likely spectroscopic confirmation
of a galaxy from our ongoing search for distant
galaxies with ISAAC/VLT.
Galaxy candidates at
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
when identified as Lyα,
in excellent agreement with the photometric redshift determination.
Redshifts
are very unlikely for various reasons we
discuss.
The object is located on the critical lines corresponding to
to 11.
The magnification factor μ ranges from 25 to 100.
For this object we estimate
yr-1 and
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
)
a lensing corrected stellar mass of
,
and luminosities of
, corresponding to a dark
matter halo of a mass of typically
.
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
© ESO, 2004
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