%0 Generic %1 meyer2020doublepeaked %A Meyer, Romain A. %A Laporte, Nicolas %A Ellis, Richard S. %A Verhamme, Anne %A Garel, Thibault %D 2020 %K library %T Double-peaked Lyman-$\alpha$ emission at z=6.803: a reionisation-era galaxy self-ionising its local HII bubble %U http://arxiv.org/abs/2010.06241 %X We report the discovery of a double-peaked Lyman-alpha profile in a galaxy at $z=6.803$, A370p\_z1, in the parallel Frontier Field of Abell 370. The velocity separation between the blue and red peaks of the Lyman-$\alpha$ profile ($\Delta v=101_-19^+38 (\pm48)\,km s^-1$) suggests an extremely high escape fraction of ionising photons $> 59(51)\% (2\sigma)$. The spectral energy distribution indicates a young ($50$ Myr), star-forming ($126 \, M_yr^-1$) galaxy with an IRAC excess implying strong OIII+H$\beta$ emission. On the basis of the high escape fraction measured, we demonstrate that A370p\_z1 was solely capable of creating an ionised bubble sufficiently large to account for the blue component of its Lyman-alpha profile. We discuss whether A370p\_z1 may be representative of a larger population of luminous $z\simeq7$ double-peaked Lyman-alpha emitting sources with high escape fractions that self-ionised their surroundings without contributions from associated UV-fainter sources.

@misc{meyer2020doublepeaked, abstract = {We report the discovery of a double-peaked Lyman-alpha profile in a galaxy at $z=6.803$, A370p\_z1, in the parallel Frontier Field of Abell 370. The velocity separation between the blue and red peaks of the Lyman-$\alpha$ profile ($\Delta v=101_{-19}^{+38} (\pm48)\,\text{km s}^{-1}$) suggests an extremely high escape fraction of ionising photons $> 59(51)\% (2\sigma)$. The spectral energy distribution indicates a young ($50$ Myr), star-forming ($12\pm 6 \, \rm{M}_\odot \rm{yr}^{-1}$) galaxy with an IRAC excess implying strong [OIII]+H$\beta$ emission. On the basis of the high escape fraction measured, we demonstrate that A370p\_z1 was solely capable of creating an ionised bubble sufficiently large to account for the blue component of its Lyman-alpha profile. We discuss whether A370p\_z1 may be representative of a larger population of luminous $z\simeq7$ double-peaked Lyman-alpha emitting sources with high escape fractions that self-ionised their surroundings without contributions from associated UV-fainter sources.}, added-at = {2020-10-14T08:12:10.000+0200}, author = {Meyer, Romain A. and Laporte, Nicolas and Ellis, Richard S. and Verhamme, Anne and Garel, Thibault}, biburl = {https://www.bibsonomy.org/bibtex/26ce3d6e1f0796198a576e386d2d17c05/gpkulkarni}, description = {Double-peaked Lyman-$\alpha$ emission at z=6.803: a reionisation-era galaxy self-ionising its local HII bubble}, interhash = {861452e4fb8516c7fc94c7214bda05dc}, intrahash = {6ce3d6e1f0796198a576e386d2d17c05}, keywords = {library}, note = {cite arxiv:2010.06241Comment: Accepted for publication in MNRAS. 7 pages, 4 figures, 3 tables}, timestamp = {2020-10-14T08:12:10.000+0200}, title = {Double-peaked Lyman-$\alpha$ emission at z=6.803: a reionisation-era galaxy self-ionising its local HII bubble}, url = {http://arxiv.org/abs/2010.06241}, year = 2020 }