The Effelsberg-Bonn HI Survey: Milky Way data

TL;DR

The Effelsberg-Bonn HI survey (EBHIS) uses a 7-Feed-Array at the Effelsberg telescope to map the Milky Way and extragalactic sky in HI, revealing detailed structures and interactions in the Milky Way's halo.

Contribution

This paper presents initial results from the EBHIS, including high-resolution mapping of Milky Way HI and insights into cloud interactions with the galactic halo.

Findings

Resolved clouds into isolated compact clumps.

Identified linewidth-radial velocity relation.

Mapped about 2000 square degrees of Milky Way sky.

Abstract

Since autumn 2008 an L-band 7-Feed-Array is operated for astronomical science at the 100-m radio telescope at Effelsberg. This receiver is used to perform an unbiased, fully sampled HI survey of the whole northern hemisphere observing both the galactic and extragalactic sky in parallel - the Effelsberg-Bonn HI survey (EBHIS). We present first results based on the Milky Way data. Up to now two larger coherent regions were mapped each covering about 2000 square degrees. One of these fields covers the northern part of the high-velocity cloud complex GCN. With the better angular resolution of the EBHIS we resolve the previously detected clouds into isolated compact clumps and find a linewidth-radial velocity relation giving hints on an interaction of accreting material with the Milky Way halo.