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Paper: Ionized Gas Ring Rotating Around the Galactic Center IMBH, IRS13E3
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 155
Authors: Tsuboi, M.; Kitamura, Y.; Tsutsumi, T.; Miyawaki, R.; Miyoshi, M.; Miyazaki, A.
Abstract: We found an ionized gas rotating around IRS13E3 using ALMA (2017.1. 00503.S), which is an intermediate mass black hole (IMBH) candidate in the Galactic center. The continuum emission map at 232 GHz shows an oval-like structure with the angular size of 0.''093× 0.''061 (1.1×1016 cm × 0.74×1016 cm). The structure is also identified in the H30α recombination line, which is seen as an inclined linear feature in the position-velocity diagram along the major axis. Such feature is usually a defining characteristic of a gas ring rotating around a massive object. The rotating velocity and orbit radius are estimated to be Vrot≃230 km s-1 and r≃6×1015 cm, respectively. The enclosed mass is derived to be Mencl.≃2.4×104M, which is within the astrometric upper limit mass when it is at the projection distance from Sgr A*. Moreover, IRS13E3 has an X-ray counterpart. These would be supporting evidences that an IMBH is embedded in IRS13E3. The electron temperature, density, and mass of the ionized gas ring are estimated to be Te≃6800 K, ne≃6×105 cm–3, and Mgas≃4×10–4 M, respectively.
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