%0 Generic %1 roche2014spectroscopy %A Roche, Nathan %A Humphrey, Andrew %A Binette, Luc %D 2014 %K emission nebular qso radio %T Spectroscopy of 7 Radio-Loud QSOs at 2<z<6: Giant Lyman-alpha Nebulae Accreting onto Host Galaxies %U http://arxiv.org/abs/1407.4046 %X We performed long-slit optical spectroscopy (GTC-OSIRIS) of 6 radio-loud QSOs at redshifts $2<z<3$, known to have giant ($50$-100 kpc) Lyman-$\alpha$ emitting nebulae, and detect extended Lyman-$\alpha$ emission for 4, with surface brightness $\sim10^-16$ ergs $cm^-2s^-1arcsec^-2$ and line width FWHM 400-1100 (mean 863) km $s^-1$. We also observed the $z\simeq 5.9$ radio-loud QSO, SDSS J2228+0110, and find evidence of a $10$ kpc extended Lyman-$\alpha$ emission nebula, a new discovery for this high-redshift object. Spatially-resolved kinematics of the 5 nebulae are examined by fitting the Lyman-$\alpha$ wavelength at a series of positions along the slit. We found the line-of-sight velocity $\Delta(v)$ profiles to be relatively flat. However, 3 of the nebulae appear systematically redshifted by 250-460 km $s^-1$ relative to the Lyman-$\alpha$ line of the QSO (with no offset for the other two), which we argue is evidence for infall. One of these (Q0805+046) had a small ($100$ km $s^-1$) velocity shift across its diameter and a steep gradient at the centre. Differences in line-of-sight kinematics between these 5 giant nebulae and similar nebulae associated with high-redshift radio galaxies (which can show steep velocity gradients) may be due to an orientation effect, which brings infall/outflow rather than rotation into greater prominence for the sources observed `on-axis' as QSOs.

@misc{roche2014spectroscopy, abstract = {We performed long-slit optical spectroscopy (GTC-OSIRIS) of 6 radio-loud QSOs at redshifts $2<z<3$, known to have giant ($\sim 50$-100 kpc) Lyman-$\alpha$ emitting nebulae, and detect extended Lyman-$\alpha$ emission for 4, with surface brightness $\sim10^{-16}$ ergs $\rm cm^{-2}s^{-1}arcsec^{-2}$ and line width FWHM 400-1100 (mean 863) km $\rm s^{-1}$. We also observed the $z\simeq 5.9$ radio-loud QSO, SDSS J2228+0110, and find evidence of a $\geq 10$ kpc extended Lyman-$\alpha$ emission nebula, a new discovery for this high-redshift object. Spatially-resolved kinematics of the 5 nebulae are examined by fitting the Lyman-$\alpha$ wavelength at a series of positions along the slit. We found the line-of-sight velocity $\Delta(v)$ profiles to be relatively flat. However, 3 of the nebulae appear systematically redshifted by 250-460 km $\rm s^{-1}$ relative to the Lyman-$\alpha$ line of the QSO (with no offset for the other two), which we argue is evidence for infall. One of these (Q0805+046) had a small ($\sim 100$ km $\rm s^{-1}$) velocity shift across its diameter and a steep gradient at the centre. Differences in line-of-sight kinematics between these 5 giant nebulae and similar nebulae associated with high-redshift radio galaxies (which can show steep velocity gradients) may be due to an orientation effect, which brings infall/outflow rather than rotation into greater prominence for the sources observed `on-axis' as QSOs.}, added-at = {2014-07-16T09:21:15.000+0200}, author = {Roche, Nathan and Humphrey, Andrew and Binette, Luc}, biburl = {https://www.bibsonomy.org/bibtex/21fafacf4a9037bc5556a33295626bf2a/miki}, description = {[1407.4046] Spectroscopy of 7 Radio-Loud QSOs at 2&lt;z&lt;6: Giant Lyman-alpha Nebulae Accreting onto Host Galaxies}, interhash = {c3437f4a100d77b1e85d3e7c7345fbcd}, intrahash = {1fafacf4a9037bc5556a33295626bf2a}, keywords = {emission nebular qso radio}, note = {cite arxiv:1407.4046Comment: 16 pages, 15 figures, accepted for publication in MNRAS}, timestamp = {2014-07-16T09:21:15.000+0200}, title = {Spectroscopy of 7 Radio-Loud QSOs at 2<z<6: Giant Lyman-alpha Nebulae Accreting onto Host Galaxies}, url = {http://arxiv.org/abs/1407.4046}, year = 2014 }