The Two-sided Jet Structures of NGC 1052 at Scales from 300 to $4 times 10^7$ Schwarzschild Radii. (arXiv:1909.12510v1 [astro-ph.GA])

The Two-sided Jet Structures of NGC 1052 at Scales from 300 to $4 times 10^7$ Schwarzschild Radii. (arXiv:1909.12510v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Nakahara_S/0/1/0/all/0/1">Satomi Nakahara</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Doi_A/0/1/0/all/0/1">Akihiro Doi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Murata_Y/0/1/0/all/0/1">Yasuhiro Murata</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nakamura_M/0/1/0/all/0/1">Masanori Nakamura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hada_K/0/1/0/all/0/1">Kazuhiro Hada</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Asada_K/0/1/0/all/0/1">Keiichi Asada</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sawada_Satoh_S/0/1/0/all/0/1">Satoko Sawada-Satoh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kameno_S/0/1/0/all/0/1">Seiji Kameno</a>

We investigated the jet width profile with distance along the jet in the
nearby radio galaxy NGC 1052 at radial distances between $sim300$ to $4 times
10^7$ Schwarzschild Radii($R_{rm S}$) from the central engine on both their
approaching and receding jet sides. The width of jets was measured in images
obtained with the VLBI Space Observatory Programme (VSOP), the Very Long
Baseline Array (VLBA), and the Very Large Array (VLA). The jet-width profile of
receding jets are apparently consistent with that of approaching jets
throughout the measuring distance ranges, indicating symmetry at least up to
the sphere of gravitational influence of the central black hole. The power-law
index $a$ of the jet-width profile ($w_{rm{jet}} propto r^{a}$, where $w_{rm
jet}$ is the jet width, $r$ is the distance from the central engine in the unit
of $R_{rm S}$) apparently shows a transition from $a sim 0$ to $a sim 1$,
i.e., the cylindrical-to-conical jet structures, at a distance of
$sim1times10^{4} R_{mathrm{S}}$. The cylindrical jet shape at the small
distances is reminiscent of the innermost jets in 3C 84. Both the central
engines of NGC 1052 and 3C 84 are surrounded by dense material, part of which
is ionized and causes heavy free-free absorption.

We investigated the jet width profile with distance along the jet in the
nearby radio galaxy NGC 1052 at radial distances between $sim300$ to $4 times
10^7$ Schwarzschild Radii($R_{rm S}$) from the central engine on both their
approaching and receding jet sides. The width of jets was measured in images
obtained with the VLBI Space Observatory Programme (VSOP), the Very Long
Baseline Array (VLBA), and the Very Large Array (VLA). The jet-width profile of
receding jets are apparently consistent with that of approaching jets
throughout the measuring distance ranges, indicating symmetry at least up to
the sphere of gravitational influence of the central black hole. The power-law
index $a$ of the jet-width profile ($w_{rm{jet}} propto r^{a}$, where $w_{rm
jet}$ is the jet width, $r$ is the distance from the central engine in the unit
of $R_{rm S}$) apparently shows a transition from $a sim 0$ to $a sim 1$,
i.e., the cylindrical-to-conical jet structures, at a distance of
$sim1times10^{4} R_{mathrm{S}}$. The cylindrical jet shape at the small
distances is reminiscent of the innermost jets in 3C 84. Both the central
engines of NGC 1052 and 3C 84 are surrounded by dense material, part of which
is ionized and causes heavy free-free absorption.

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