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| EPoS Contribution |
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The Galactic dynamics revealed by the filamentary structure in the atomic and molecular emission toward the Milky Way’s disk
Juan-Diego Soler (talk given by Jonas Syed) IAPS-INAF, Rome, IT | |
| We present a study of the filamentary structure in the neutral atomic hydrogen (HI) emission at 21 cm using the observation at 16.2 arcminutes resolution in the HI4PI survey across the Galactic plane and at 40-arcseconds resolution in The HI/OH/Recombination-line (THOR) survey toward the first Galactic quadrant. We found that the Milky Way's disk regions beyond ten kpc and up to roughly 18 kpc from the Galactic center display HI filamentary structures predominantly parallel to the Galactic plane. However, we found that the HI filaments are mostly perpendicular or do not have preferred orientation with respect to the Galactic plane for regions at lower Galactocentric radii. We interpret these results as the imprint of supernova feedback in the inner Galaxy and Galactic rotation and shear in the outer Milky Way. We also studied the carbon monoxide (CO) emission observations obtained in The Milky Way Imaging Scroll Painting (MWISP) survey. We found that the orientations of the filamentary structures traced by CO emission differed from those found in the HI emission. We consider this to indicate that the molecular structures do not simply inherit these properties from parental atomic clouds. Instead, they are shaped by local physical conditions, such as stellar feedback, magnetic fields, and Galactic spiral shocks. | |
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| Caption: Face-on view of the atomic hydrogen filament orientation in the Milky Way disk | |
| Collaborators: J. Syed, MPIA, DE M.-A. Miville-Deschenes, CEA, FR S. Molinari, IAPS-INAF, IT R. S. Klessen, ITA, DE P. Hennebelle, CEA, FR L.Testi, ESO, DE N. M. McClure-Griffiths, ANU, AU H. Beuther, MPIA, DE D. Elia, IAPS-INAF, IT E. Schisano, IAPS-INAF, IT A. Traficante, IAPS-INAF, IT P. Girichidis, ITA, DE S.C.O. Glover, ITA, DE M. Sormani, ITA, DE R.J. Smith, U Manchester, UK |
Key publication
Suggested Session: Galactic Dynamics & SF |