Cloud-Milky Way collisions in the outer Galaxy

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168823· OSTI ID:6933221

Mirabel, I F; Morras, R ^[1]

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1. CEA, Service d'Astrophysique, Gif-sur-Yvette (France) Universidad de Puerto Rico, Rio Piedras (Puerto Rico) CONICET, Instituto Argentino de Radioastronomia, Villa Elisa (Argentina)

Observations at 21 cm of atomic H in the anticenter show that a stream of very high velocity clouds has reached the outer Galaxy and it is interacting with matter associated with the Milky Way. High-resolution observations of the leading edge of the infalling stream of high-velocity clouds reveal shock structures that are indicative of the physical interaction in the gas over a velocity range of 250 km/s. The infall of high-velocity clouds in the anticenter is injecting into the Galactic disk energies above 10 to the 53rd ergs and triggering the most energetic structural disturbance in the Galaxy, the anticenter supershell of H I. It is concluded that the accretion of neutral gas may be an important phenomenon for the energy budget in the outer Galaxy. 16 refs.

• OSTI ID: 6933221
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 356; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTRONOMY
COSMIC GASES
COSMIC RADIO SOURCES
EMISSION SPECTRA
ENERGY TRANSFER
FLUIDS
GALAXIES
GASES
H1 REGIONS
INTERSTELLAR SPACE
MASS TRANSFER
MILKY WAY
NEBULAE
RADIOASTRONOMY
SHOCK WAVES
SPACE
SPECTRA