Browsing by Author "Osorno Quiceno, Juan David"

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    Cinemática y dinámica de gas ionizado en el núcleo de la galaxia M87.
    (Universidad de Concepción, 2023) Osorno Quiceno, Juan David; Mark Nagar, Neil
    The black hole mass measurement of the galaxy M87, based on its stellar kinematics, is twice that determined via ionized gas kinematics, with the values disagreeing by more than 3σ. In order to gain insights into the reasons behind the disagreement between the measurements, it is needed to better constrain the morphology and kinematics of the ionized gas in the nuclear region. The new narrow field mode with adaptive optics integral field spectroscopic data, from the Multi Unit Spectroscopic Explorer instrument on the Very Large Telescope, covers in detail the nuclear region of the galaxy, and is used with a wide field mode data set to model the morphology and kinematics of multiple ionized gas emission lines. Moment maps and position-velocity diagrams are used to describe the ionized gas kinematics in both the large-scale and the galaxy nucleus; the position angle and inclination of the rotating disk are fixed using the program Kinemetry; simulated data cubes, across a range of black hole masses and disk inclinations, are created to obtain the best-fit model, by the parameterization of the differences of the residual (observed minus simulated) velocity maps. The results reveal complexities in the nuclear ionized gas kinematics not seen in earlier sparse and shallower spectroscopy: several ionized gas filaments, some with high flow velocities, which can be traced down into the projected sphere of influence; a partially filled biconical outflow, aligned with the jet, with radial velocities up to 400 km s−1; and a rotating ionized gas disk, with twisted velocity isophotes. The complexity of the nuclear morphology and kinematics precludes the measurement of an accurate black hole mass from the ionized gas kinematics. The fits to the subarcsecond disk inclinations from Kinemetry, and the statistics from the velocity residual maps, support a high black hole mass of about 6.0 × 109 M⊙ and low inclination disk of 25◦, rather than the previously proposed 3.5 × 109 M⊙ black hole mass with a 42◦ inclination disk.
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