# The Lyman-alpha emission of high-z damped Lyman-alpha systems

@article{Rahmani2010TheLE,
title={The Lyman-alpha emission of high-z damped Lyman-alpha systems},
author={Hadi Rahmani and R. Srianand and P. Noterdaeme and Patrick Petitjean},
journal={arXiv: Cosmology and Nongalactic Astrophysics},
year={2010}
}
• H. Rahmani, +1 author P. Petitjean
• Published 7 September 2010
• Physics
• arXiv: Cosmology and Nongalactic Astrophysics
Using a spectral stacking technique we searched for the average \lya emission from high-z Damped \lya (DLA) galaxies detected in the Sloan Digital Sky Survey QSO spectra. We used a sample of 341 DLAs of mean redshift = 2.86 and log N(HI) > 20.62 to place a 3$\sigma$ upper limit of 3.0 \times 10^{-18} erg s^{-1} cm^{-2} on the \lya flux emitted within $\sim$1.5 arcsec (or 12 kpc) from the QSO line of sight. This corresponds to an average \lya luminosity of < 2 \times 10^{41} erg s^{-1} or 0.03… Expand
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