A giant Ly$alpha$ nebula and a small-scale clumpy outflow in the system of the exotic quasar J0952+0114 unveiled by MUSE. (arXiv:1906.06347v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Marino_R/0/1/0/all/0/1">R. A. Marino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cantalupo_S/0/1/0/all/0/1">S. Cantalupo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pezzulli_G/0/1/0/all/0/1">G. Pezzulli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lilly_S/0/1/0/all/0/1">S. J. Lilly</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gallego_S/0/1/0/all/0/1">S. Gallego</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mackenzie_R/0/1/0/all/0/1">R. Mackenzie</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Matthee_J/0/1/0/all/0/1">J. Matthee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brinchmann_J/0/1/0/all/0/1">J. Brinchmann</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bouche_N/0/1/0/all/0/1">N. Bouch&#xe9;</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Feltre_A/0/1/0/all/0/1">A. Feltre</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Muzahid_S/0/1/0/all/0/1">S. Muzahid</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schroetter_I/0/1/0/all/0/1">I. Schroetter</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Johnson_S/0/1/0/all/0/1">S. D. Johnson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nanayakkara_T/0/1/0/all/0/1">T. Nanayakkara</a>

The well-known quasar SDSS J095253.83+011421.9 (J0952+0114) at z=3.02 has one
of the most peculiar spectra discovered so far, showing the presence of narrow
Ly$alpha$ and broad metal emission lines. Although recent studies have
suggested that a Proximate Damped Ly$alpha$ system (PDLA) causes this peculiar
spectrum, the origin of the gas associated with the PDLA is unknown. Here we
report the results of MUSE observations that reveal a new giant ($approx$ 100
physical kpc) Lyman $alpha$ nebula. The detailed analysis of the Ly$alpha$
velocity, velocity dispersion, and surface brightness profiles suggests that
the J0952+0114 Ly$alpha$ nebula shares similar properties of other QSO nebulae
previously detected with MUSE, implying that the PDLA in J0952+0144 is covering
only a small fraction of the QSO emission solid angle. We also detected bright
and spectrally narrow CIV$lambda$1550 and HeII$lambda$1640 extended emission
around J0952+0114 with velocity centroids similar to the peak of the extended
and central narrow Ly$alpha$ emission. The presence of a peculiarly bright,
unresolved, and relatively broad HeII$lambda$1640 emission in the central
region at exactly the same PDLA redshift hints at the possibility that the PDLA
originates in a clumpy outflow with a bulk velocity of about 500 km/s. The
smaller velocity dispersion of the large scale Ly$alpha$ emission suggests
that the high-speed outflow is confined to the central region. Lastly, the
derived spatially resolved HeII/Ly$alpha$ and CIV/Ly$alpha$ maps show a
positive gradient with the distance to the QSO hinting at a non-homogeneous
ionization parameter distribution.

The well-known quasar SDSS J095253.83+011421.9 (J0952+0114) at z=3.02 has one
of the most peculiar spectra discovered so far, showing the presence of narrow
Ly$alpha$ and broad metal emission lines. Although recent studies have
suggested that a Proximate Damped Ly$alpha$ system (PDLA) causes this peculiar
spectrum, the origin of the gas associated with the PDLA is unknown. Here we
report the results of MUSE observations that reveal a new giant ($approx$ 100
physical kpc) Lyman $alpha$ nebula. The detailed analysis of the Ly$alpha$
velocity, velocity dispersion, and surface brightness profiles suggests that
the J0952+0114 Ly$alpha$ nebula shares similar properties of other QSO nebulae
previously detected with MUSE, implying that the PDLA in J0952+0144 is covering
only a small fraction of the QSO emission solid angle. We also detected bright
and spectrally narrow CIV$lambda$1550 and HeII$lambda$1640 extended emission
around J0952+0114 with velocity centroids similar to the peak of the extended
and central narrow Ly$alpha$ emission. The presence of a peculiarly bright,
unresolved, and relatively broad HeII$lambda$1640 emission in the central
region at exactly the same PDLA redshift hints at the possibility that the PDLA
originates in a clumpy outflow with a bulk velocity of about 500 km/s. The
smaller velocity dispersion of the large scale Ly$alpha$ emission suggests
that the high-speed outflow is confined to the central region. Lastly, the
derived spatially resolved HeII/Ly$alpha$ and CIV/Ly$alpha$ maps show a
positive gradient with the distance to the QSO hinting at a non-homogeneous
ionization parameter distribution.

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