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The HI Distribution Observed toward a Halo Region of the Milky Way

Observatorio Astronómico de Quito, Escuela Politécnica Nacional, Av. Gran Colombia S/N, Quito 170403, Ecuador
Author to whom correspondence should be addressed.
Academic Editor: Emilio Elizalde
Galaxies 2017, 5(3), 45;
Received: 18 July 2017 / Revised: 23 August 2017 / Accepted: 24 August 2017 / Published: 28 August 2017
(This article belongs to the Special Issue On the Origin (and Evolution) of Baryonic Galaxy Halos)
PDF [456 KB, uploaded 28 August 2017]


We use observations of the neutral atomic hydrogen (HI) 21-cm emission line to study the spatial distribution of the HI gas in a 80° × 90° region of the Galaxy halo. The HI column densities in the range of 3–11 × 10 20 cm 2 have been estimated for some of the studied regions. In our map—obtained with a spectral sensitivity of ∼2 K—we do not detect any HI 21-cm emission line above 2 σ at Galactic latitudes higher than ∼46°. This report summarizes our contribution presented at the conference on the origin and evolution of barionic Galaxy halos. View Full-Text
Keywords: 21-cm emission line; Galaxy halo; interstellar medium 21-cm emission line; Galaxy halo; interstellar medium

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López, E.; Armijos, J.; Llerena, M.; Aldás, F. The HI Distribution Observed toward a Halo Region of the Milky Way. Galaxies 2017, 5, 45.

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