NuSTAR hard X-ray data and Gemini 3D spectra reveal powerful AGN and
  outflow histories in two low-redshift Lyman-$\alpha$ blobs
  We have shown that Lyman-$\alpha$ blobs (LABs) may still exist even at
$z\sim0.3$, about 7 billion years later than most other LABs known (Schirmer et
al. 2016). Their luminous Ly$\alpha$ and [OIII] emitters at $z\sim0.3$ offer
new insights into the ionization mechanism. This paper focuses on the two X-ray
brightest LABs at $z\sim0.3$, SDSS J0113$+$0106 (J0113) and SDSS J1155$-$0147
(J1155), comparable in size and luminosity to `B1', one of the best-studied
LABs at $z \gtrsim$ 2. Our NuSTAR hard X-ray (3--30 keV) observations reveal
powerful active galactic nuclei (AGN) with $L_{2-10{\;\rm
keV}}=(0.5$--$3)\times10^{44}$ erg cm$^{-2}$ s$^{-1}$. J0113 also faded by a
factor of $\sim 5$ between 2014 and 2016, emphasizing that variable AGN may
cause apparent ionization deficits in LABs. Joint spectral analyses including
Chandra data constrain column densities of $N_{\rm
H}=5.1^{+3.1}_{-3.3}\times10^{23}$ cm$^{-2}$ (J0113) and $N_{\rm
H}=6.0^{+1.4}_{-1.1}\times10^{22}$ cm$^{-2}$ (J1155). J0113 is likely buried in
a torus with a narrow ionization cone, but ionizing radiation is also leaking
in other directions as revealed by our Gemini/GMOS 3D spectroscopy. The latter
shows a bipolar outflow over $10$ kpc, with a peculiar velocity profile that is
best explained by AGN flickering. X-ray analysis of J1155 reveals a weakly
absorbed AGN that may ionize over a wide solid angle, consistent with our 3D
spectra. Extinction corrected [OIII] log-luminosities are high, $\sim43.6$. The
velocity dispersions are low, $\sim100$--$150$ km s$^{-1}$, even at the AGN
positions. We argue that this is a combination of high extinction hiding the
turbulent gas, and previous outflows that have cleared the escape paths for
their successors.
