%0 Generic %1 cai2016discovery %A Cai, Zheng %A Fan, Xiaohui %A Yang, Yujin %A Bian, Fuyan %A Prochaska, J. Xavier %A Zabludoff, Ann %A McGreer, Ian %A Zheng, Zhenya %A Green, Richard %A Cantalupo, Sebastiano %A Frye, Brenda %A Hamden, Erika %A Jiang, Linhua %A Kashikawa, Nobunari %A Wang, Ran %D 2016 %K galaxy massive nebula overdensity %T Discovery of an Enormous Ly$\alpha$ nebula in a massive galaxy overdensity at $z=2.3$ %U http://arxiv.org/abs/1609.04021 %X Enormous Ly$\alpha$ Nebulae (ELANe), unique tracers of galaxy density peaks, are predicted to lie at the nodes and intersections of cosmic filamentary structures. Previous successful searches for ELANe have focused on wide-field narrowband surveys, or have targeted known sources such as ultraluminous quasi-stellar-objects (QSOs) or radio galaxies. Utilizing groups of coherently strong Ly$\alpha$ absorptions (CoSLAs), we have developed a new method to identify high-redshift galaxy overdensities and have identified an extremely massive overdensity, BOSS1441, at $z=2-3$ (Cai et al. 2016a). In its density peak, we discover an ELAN that is associated with a relatively faint continuum. To date, this object has the highest diffuse Ly$\alpha$ nebular luminosity of $L_nebula=5.1\pm0.1\times10^44$ erg s$^-1$. Above the 2$\sigma$ surface brightness limit of SB$_Ly\alpha= 4.8\times10^-18$ erg s$^-1$ cm$^-2$ arcsec$^-2$, this nebula has an end-to-end spatial extent of 442 kpc. This radio-quiet source also has extended \civ\ $łambda1549$ and \heii\ $łambda1640$ emission on $\gtrsim30$ kpc scales. Note that the Ly$\alpha$, \heii\ and \civ\ emission all have double-peaked line profiles. Each velocity component has a full-width-half-maximum (FWHM) of $\approx700 - 1000$ km s$^-1$. We argue that this Ly$\alpha$ nebula could be powered by shocks due to an AGN-driven outflow or/and photoionization by a strongly obscured source.

@misc{cai2016discovery, abstract = {Enormous Ly$\alpha$ Nebulae (ELANe), unique tracers of galaxy density peaks, are predicted to lie at the nodes and intersections of cosmic filamentary structures. Previous successful searches for ELANe have focused on wide-field narrowband surveys, or have targeted known sources such as ultraluminous quasi-stellar-objects (QSOs) or radio galaxies. Utilizing groups of coherently strong Ly$\alpha$ absorptions (CoSLAs), we have developed a new method to identify high-redshift galaxy overdensities and have identified an extremely massive overdensity, BOSS1441, at $z=2-3$ (Cai et al. 2016a). In its density peak, we discover an ELAN that is associated with a relatively faint continuum. To date, this object has the highest diffuse Ly$\alpha$ nebular luminosity of $L_{\rm{nebula}}=5.1\pm0.1\times10^{44}$ erg s$^{-1}$. Above the 2$\sigma$ surface brightness limit of SB$_{\rm{Ly\alpha}}= 4.8\times10^{-18}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$, this nebula has an end-to-end spatial extent of 442 kpc. This radio-quiet source also has extended \civ\ $\lambda1549$ and \heii\ $\lambda1640$ emission on $\gtrsim30$ kpc scales. Note that the Ly$\alpha$, \heii\ and \civ\ emission all have double-peaked line profiles. Each velocity component has a full-width-half-maximum (FWHM) of $\approx700 - 1000$ km s$^{-1}$. We argue that this Ly$\alpha$ nebula could be powered by shocks due to an AGN-driven outflow or/and photoionization by a strongly obscured source.}, added-at = {2016-09-15T11:00:07.000+0200}, author = {Cai, Zheng and Fan, Xiaohui and Yang, Yujin and Bian, Fuyan and Prochaska, J. Xavier and Zabludoff, Ann and McGreer, Ian and Zheng, Zhenya and Green, Richard and Cantalupo, Sebastiano and Frye, Brenda and Hamden, Erika and Jiang, Linhua and Kashikawa, Nobunari and Wang, Ran}, biburl = {https://www.bibsonomy.org/bibtex/28675937139f42db1421f36195f2fde4c/miki}, description = {[1609.04021] Discovery of an Enormous Ly$\alpha$ nebula in a massive galaxy overdensity at $z=2.3$}, interhash = {326920530b7cff7bae7870f271a1c12f}, intrahash = {8675937139f42db1421f36195f2fde4c}, keywords = {galaxy massive nebula overdensity}, note = {cite arxiv:1609.04021Comment: submitted to ApJ; 12 pages, 8 figures}, timestamp = {2016-09-15T11:00:07.000+0200}, title = {Discovery of an Enormous Ly$\alpha$ nebula in a massive galaxy overdensity at $z=2.3$}, url = {http://arxiv.org/abs/1609.04021}, year = 2016 }