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We present a new face-on map of dense neutral atomic hydrogen (HI) gas in theouter Galaxy. Our map has been produced from the Leiden/Argentine/Bonn (LAB) HI21-cm line all-sky survey by finding intensity maxima along every line of sightand then by projecting them on the Galactic plane. The resulting face-on mapstrikingly reveals the complex spiral structure beyond the solar circle, whichis characterized by a mixture of distinct long arcs of HI concentrations andnumerous 'interarm' features. The comparison with more conventional spiraltracers confirms the nature of those long arc structures as spiral arms. Ourmap shows that the HI spiral structure in the outer Galaxy is well described bya four-arm spiral model (pitch angle of 12 deg) with some deviations, and givesa new insight into identifying HI features associated with individual arms.

Tracing the Spiral Structure of the Outer Milky Way with Dense Atomic Hydrogen Gas