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American Astronomical Society, Astrophysical Journal Letters, 1(770), p. L4, 2013

DOI: 10.1088/2041-8205/770/1/l4

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Atomic Hydrogen in a Galactic Center Outflow

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Preprint: archiving forbidden
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Postprint: archiving forbidden
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Abstract

We describe a population of small, high velocity, atomic hydrogen clouds, loops, and filaments found above and below the disk near the Galactic Center. The objects have a mean radius of 15 pc, velocity widths of $∼ 14$ km/s and are observed at $|z|$ heights up to 700 pc. The velocity distribution of the clouds shows no signature of Galactic rotation. We propose a scenario where the clouds are associated with an outflow from a central star-forming region at the Galactic Center. We discuss the clouds as entrained material traveling at $∼ 200$ km/s in a Galactic wind. ; Comment: Accepted for publication in Astrophysical Journal Letters