%0 Generic %1 yang2014lyalpha %A Yang, Huan %A Wang, JunXian %A Zheng, Zhen-Ya %A Malhotra, Sangeeta %A Rhoads, James E. %A Infante, Leopoldo %D 2014 %K agn broad emission lya %T A z ~ 5.7 Ly\alpha Emission Line with an Ultra Broad Red Wing %U http://arxiv.org/abs/1401.7785 %X Using Ly\alpha emission line as a tracer of high redshift star forming galaxies, hundreds of Ly\alpha emission line galaxies (LAEs) at z > 5 have been detected. These LAEs are considered to be low mass young galaxies, critical to the reionization of the universe and the metal enrichment of circumgalactic medium (CGM) and intergalactic medium (IGM). It is assumed that outflows in LAEs can help ionizing photons and Ly\alpha photons escape out of galaxies. However we still know little about the outflows in high redshifts LAEs due to observational difficulties, especially at redshift > 5. Models of Ly\alpha radiative transfer predict asymmetric Ly\alpha line profiles with broad red wing in LAEs with outflows. Here we report a z ~ 5.7 Ly\alpha emission line with a broad red wing extending to > 1000 km/s relative to the peak of Ly\alpha line, which has been detected in only a couple of z > 5 LAEs till now. If the broad red wing is ascribed to gas outflow instead of AGN activity, the outflow velocity could be larger than the escape velocity (~ 500 km/s) of typical halo mass of z ~ 5.7 LAEs, being consistent with the picture that outflows in LAEs disperse metals to CGM and IGM.

@misc{yang2014lyalpha, abstract = {Using Ly{\alpha} emission line as a tracer of high redshift star forming galaxies, hundreds of Ly{\alpha} emission line galaxies (LAEs) at z > 5 have been detected. These LAEs are considered to be low mass young galaxies, critical to the reionization of the universe and the metal enrichment of circumgalactic medium (CGM) and intergalactic medium (IGM). It is assumed that outflows in LAEs can help ionizing photons and Ly{\alpha} photons escape out of galaxies. However we still know little about the outflows in high redshifts LAEs due to observational difficulties, especially at redshift > 5. Models of Ly{\alpha} radiative transfer predict asymmetric Ly{\alpha} line profiles with broad red wing in LAEs with outflows. Here we report a z ~ 5.7 Ly{\alpha} emission line with a broad red wing extending to > 1000 km/s relative to the peak of Ly{\alpha} line, which has been detected in only a couple of z > 5 LAEs till now. If the broad red wing is ascribed to gas outflow instead of AGN activity, the outflow velocity could be larger than the escape velocity (~ 500 km/s) of typical halo mass of z ~ 5.7 LAEs, being consistent with the picture that outflows in LAEs disperse metals to CGM and IGM.}, added-at = {2014-01-31T11:32:20.000+0100}, author = {Yang, Huan and Wang, JunXian and Zheng, Zhen-Ya and Malhotra, Sangeeta and Rhoads, James E. and Infante, Leopoldo}, biburl = {https://www.bibsonomy.org/bibtex/27e24e918dd3b750e788b8a1f8b35fbd0/miki}, description = {[1401.7785] A z ~ 5.7 Ly{\alpha} Emission Line with an Ultra Broad Red Wing}, interhash = {9c633bd0e5c678ba7b65d7714c94936a}, intrahash = {7e24e918dd3b750e788b8a1f8b35fbd0}, keywords = {agn broad emission lya}, note = {cite arxiv:1401.7785Comment: Accepted to ApJ}, timestamp = {2014-01-31T11:32:20.000+0100}, title = {A z ~ 5.7 Ly{\alpha} Emission Line with an Ultra Broad Red Wing}, url = {http://arxiv.org/abs/1401.7785}, year = 2014 }