Issue |
A&A
Volume 428, Number 3, December IV 2004
|
|
---|---|---|
Page(s) | L29 - L32 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200400099 | |
Published online | 07 December 2004 |
Letter to the Editor
Reanalysis of the spectrum of the z = 10 galaxy
Astrophysics Group, Blackett Laboratory, Imperial College London, London SW7 2BW, UK e-mail: stephen.weatherley@imperial.ac.uk
Received:
26
July
2004
Accepted:
2
November
2004
In a recent paper Pelló et al. reported observations of a faint
galaxy, gravitationally lensed by the galaxy cluster Abell 1835. Deep
J-band spectroscopy revealed a weak emission line near 1.34 microns,
detected in two spectra with different central wavelengths. The line
was interpreted as Lyα at redshift . This interpretation is supported
by the broad-band photometric spectral energy distribution, and by
the location of the galaxy close to the lens critical line for this
redshift. We have reanalysed the two spectra, just released from the
data archive. Our analysis includes allowance for wavelength shifts
due to transverse drift of the object in the slit. We do not detect a
significant emission line at the reported location, or nearby, at either grating setting, nor in the combined spectrum. We provide a possible explanation for the reported detection as
due to spurious positive flux introduced in the sky-subtraction stage as a result of
variable hot pixels. We provide our final reduced 2D frame, and corresponding error array.
Key words: galaxies: high redshift / infrared: galaxies / cosmology: observations / cosmology: early Universe
© ESO, 2004
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