Compton-thick AGN in the NuSTAR era II: A deep NuSTAR and XMM-Newton view of the candidate Compton thick AGN in NGC 1358. (arXiv:1811.06027v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Zhao_X/0/1/0/all/0/1">X. Zhao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marchesi_S/0/1/0/all/0/1">S. Marchesi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ajello_M/0/1/0/all/0/1">M. Ajello</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marcotulli_L/0/1/0/all/0/1">L. Marcotulli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gusumano_G/0/1/0/all/0/1">G. Gusumano</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Parola_V/0/1/0/all/0/1">V. La Parola</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vignali_C/0/1/0/all/0/1">C. Vignali</a>
We present the combined NuSTATR and XMM-Newton 0.6-79 keV spectral analysis
of a Seyfert 2 galaxy, NGC 1358, which we selected as a candidate Compton thick
(CT-) active galactic nucleus (AGN) on the basis of previous Swift/BAT and
Chandra studies. According to our analysis, NGC 1358 is confirmed to be a
CT-AGN using physical motivated models, at >3 $sigma$ confidence level. Our
best-fit shows that the column density along the ‘line-of-sight’ of the
obscuring material surrounding the accreting super-massive black hole is N$rm
_H$ = [1.96–2.80] $times$ 10$^{24}$ cm$^{-2}$. The high-quality data from
NuSTAR gives the best constraints on the spectral shape above $sim$10 keV to
date on NGC 1358. Moreover, by combining NuSTAR and XMM-Newton data, we find
that the obscuring torus has a low covering factor ($f_c$ <0.17), and the
obscuring material is distributed in clumps, rather than uniformly. We also
derive an estimate of NGC 1358's Eddington ratio, finding it to be
$lambda_{rm Edd}$ $sim$$4.7_{-0.3}^{+0.3}$ $times$ 10$^{-2}$, which is in
acceptable agreement with previous measurements. Finally, we find no evidence
of short-term variability, over a $sim$100 ks time-span, in terms of both
'line-of-sight' column density and flux.
We present the combined NuSTATR and XMM-Newton 0.6-79 keV spectral analysis
of a Seyfert 2 galaxy, NGC 1358, which we selected as a candidate Compton thick
(CT-) active galactic nucleus (AGN) on the basis of previous Swift/BAT and
Chandra studies. According to our analysis, NGC 1358 is confirmed to be a
CT-AGN using physical motivated models, at >3 $sigma$ confidence level. Our
best-fit shows that the column density along the ‘line-of-sight’ of the
obscuring material surrounding the accreting super-massive black hole is N$rm
_H$ = [1.96–2.80] $times$ 10$^{24}$ cm$^{-2}$. The high-quality data from
NuSTAR gives the best constraints on the spectral shape above $sim$10 keV to
date on NGC 1358. Moreover, by combining NuSTAR and XMM-Newton data, we find
that the obscuring torus has a low covering factor ($f_c$ <0.17), and the
obscuring material is distributed in clumps, rather than uniformly. We also
derive an estimate of NGC 1358’s Eddington ratio, finding it to be
$lambda_{rm Edd}$ $sim$$4.7_{-0.3}^{+0.3}$ $times$ 10$^{-2}$, which is in
acceptable agreement with previous measurements. Finally, we find no evidence
of short-term variability, over a $sim$100 ks time-span, in terms of both
‘line-of-sight’ column density and flux.
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