Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..269m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 269-275.
Astronomy and Astrophysics
Astrophysics
16
H I Regions, Interacting Galaxies, Milky Way Galaxy, Molecular Clouds, Interstellar Matter, Shock Layers
Scientific paper
Observational evidence concerning the North Celestial Pole Loop (NCP Loop) and the Chain A complex of H-I high-velocity clouds are compared with the theoretical description of a cloud-Galaxy collision. The main points are that the NCP Loop is cylindrical rather than spherical, and that low, intermediate, and high-velocity H-I clouds in the area seem interrelated. The observations are consistent with the scenario of a halo cloud of 350 solar masses having collided with the galactic disk at a velocity of 325 km/s. The collision took place in two steps; in the collision with the warm intercloud medium, the infalling cloud is only moderately decelerated. This collision has already finished, and the shocked layer appears as high-velocity clouds still moving downward into the galactic disk. In a second step parts of this shocked layer encounter disk clouds thus producing the intermediate velocity clouds. The NCP Loop itself results from the lateral expansion of the cavity produced during the infall.
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