Inflow of halo gas from the direction of the Galactic north pole

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Structure, Interstellar Gas, Milky Way Galaxy, North Polar Spur (Astronomy), Ultraviolet Astronomy, Globular Clusters, Interstellar Extinction, Iue, Radial Velocity, Stellar Spectra, Ultraviolet Spectra

Scientific paper

A far-UV echelle spectrum has been obtained of the UV-bright star vZ1128 in the globular cluster M3. This cluster lies in a direction 11° off the galactic North Pole at a distance of about 10 kpc. Only the usually strong interstellar lines are recognizable in the faint spectrum, and they show absorption at velocities from near +40 km s-1 to -100 km s-1. Since in the direction observed the line of sight component of the Milky Way rotation is negligible, the detected velocities demonstrate for this direction the motion of gas from the Milky Way halo toward the disk. Gas returning to the disk in a galactic fountain like flow may explain the observations.

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