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

  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},
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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