H I Jet G40-15 from a Rotating Cloud in the 4-kpc Molecular Ring: Magnetized Outflow and Formation of a Dense Star Cluster

Details H I Jet G40-15 from a Rotating Cloud in the 4-kpc Molecular Ring: Magnetized Outflow and Formation of a Dense Star Cluster H I Jet G40-15 from a Rotating Cloud in the 4-kpc Molecular Ring: Magnetized Outflow and Formation of a Dense Star Cluster

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..633s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.4, pp. 633-643

Astronomy and Astrophysics

Astronomy

3

Galactic Shock, Galaxy: H I, Galaxy: Spurs, Magnetic Jets, Molecular Clouds, Star Clusters: Formation

Scientific paper

A giant H I spur centered on (l, b)=(40°, -15°), (G40 - 15) emanates from G30 - 00 toward negative high latitude. The spur is known as the Smith cloud and as a high-velocity cloud HVC 40 - 15 + 100, while we call it H I jet G40 - 15. The radial velocity ranges from 80 to 120 km s-1 with the center velocity at ˜ 100 km s-1. Both the kinematical and positional coordinates are coincident with those of the tangential point of the 4-kpc molecular ring of the Galaxy. We interpret this spur as being a magnetized H I jet emanating from the 4-kpc molecular ring of the galactic disk. The kinematical distance is estimated to be 6.9kpc from the Sun, and the jet's top (G50 - 26) is -3.4 kpc high from the galactic plane. The whole extent is 4.4kpc in length and 300pc in width. The total H I mass is ˜ 3 × 105 Msolar, and the energy to lift the mass from the galactic plane is ˜ 1052 erg. We propose an acceleration mechanism of such an extremely high-altitude coherent H I structure by a twisting magnetic jet associated with a collapsing molecular cloud in the galactic disk. We suggest a scenario for the formation of a dense star cluster, such as a globular cluster, from a collapsing cloud core with a twisting magnetic outflow.

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