The MBHBM* Project — I: Measurement of the Central Black Hole Mass in Dwarf Galaxy NGC 3504 Using Molecular Gas Kinematics. (arXiv:1902.03813v1 [astro-ph.GA])

The MBHBM* Project — I: Measurement of the Central Black Hole Mass in Dwarf Galaxy NGC 3504 Using Molecular Gas Kinematics. (arXiv:1902.03813v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Nguyen_D/0/1/0/all/0/1">Dieu D. Nguyen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brok_M/0/1/0/all/0/1">Mark den Brok</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Seth_A/0/1/0/all/0/1">Anil C. Seth</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Iguchi_S/0/1/0/all/0/1">Satoru Iguchi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Greene_J/0/1/0/all/0/1">Jenny E. Greene</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Davis_T/0/1/0/all/0/1">Timothy Davis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Imanishi_M/0/1/0/all/0/1">Masatoshi Imanishi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Takuma/0/1/0/all/0/1">Takuma</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Izumi/0/1/0/all/0/1">Izumi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cappellari_M/0/1/0/all/0/1">Michelle Cappellari</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Neumayer_N/0/1/0/all/0/1">Nadine Neumayer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nyland_K/0/1/0/all/0/1">Kristina Nyland</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tsukui_T/0/1/0/all/0/1">Takafumi Tsukui</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nakanishi_K/0/1/0/all/0/1">Kouichiro Nakanishi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nguyen_P/0/1/0/all/0/1">Phuong M. Nguyen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nguyen_Q/0/1/0/all/0/1">Quang L. Nguyen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Thater_S/0/1/0/all/0/1">Sabine Thater</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bureau_M/0/1/0/all/0/1">Martin Bureau</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Onishi_K/0/1/0/all/0/1">Kyoko Onishi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Voggel_K/0/1/0/all/0/1">Karina T. Voggel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Le_N/0/1/0/all/0/1">Ngan M. Le</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dinh_T/0/1/0/all/0/1">Trung V. Dinh</a>

We present the first measurement of the mass of a supermassive black hole
(SMBH) in the nearby double-barred spiral galaxy NGC 3504 as part of the
Measuring Black Holes Below the Milky Way ($M_{star}$) mass galaxies
(MBHBM$_{star}$) Project. Our analysis is based on Atacama Large
Millimeter/submillimeter Array (ALMA) Cycle-5 observations of the ${rm
^{12}CO(2-1)}$ emission line. NGC 3504 has a circumnuclear gas disk (CND),
which has a relatively high-velocity dispersion of 30 kms. Our dynamical
models of the CND yield a Mbh~of $M_{rm
BH}=1.02^{+0.18}_{-0.15}times10^7$Msun and a mass-to-light ratio in $H$-band
of ml$_{rm H}=0.66^{+1.44}_{-0.65}$ (Msun/Lsun). This black hole (BH) mass
is consistent with BH–galaxy scaling relations. We also detect a central
deficiency in the ${rm ^{12}CO(2-1)}$ integrated intensity map with a diameter
of 2.7 pc at the putative position of the SMBH. However, this hole is filled by
a dense gas tracer ${rm CS(5-4)}$ that peaks at the galaxy center found in one
of the three low-velocity-resolution continuum spectral correlators. The ${rm
CS(5-4)}$ line has the same kinematics with the ${rm ^{12}CO(2-1)}$ line
within the CND, suggesting that it is also an alternative transition for
measuring the central Mbh~in NGC 3504 probably more accurately than the
current commonly used of ${rm ^{12}CO(2-1)}$ due to its centralization.

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