Kinetic tomography of the Galactic disk: revealing the local ISM motions using 3D dust, line emission, and machine vision

Juan Soler

Thursday, Dec. 5th, 9:00CET

We present a reconstruction of the motions in the interstellar medium (ISM) based on the combination of a state-of-the-art three-dimensional model of the dust distribution within 1.25 kpc from the Sun and the line emission observations from neutral atomic hydrogen (HI) and carbon monoxide (CO) within the Galactic latitude |b| < 5 deg. We combined the data using the histogram of oriented gradient (HOG) method, a computer vision technique for evaluating the morphological correlation between images. Using the HOG method, we assigned line-of-sight velocities to the dust parcels across distances to produce a face-on map of the local ISM's heliocentric motions. We used the resulting maps to calculate the amplitude of streaming motions, kinetic energy and momentum distributions, and the mass flow rates in the local ISM. We report the global averages of these fundamental quantities and the fluctuations that reveal the input from stellar feedback and its imprint in the large-scale gas dynamics in the Solar neighborhood.