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arxiv: 1610.06175 · v1 · pith:RLI655R4new · submitted 2016-10-19 · 🌌 astro-ph.GA

HI4PI: A full-sky HI survey based on EBHIS and GASS

HI4PI Collaboration: N. Ben Bekhti , L. Fl\"oer , R. Keller , J. Kerp , D. Lenz , B. Winkel , J. Bailin , M. R. Calabretta
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L. Dedes H. A. Ford B. K. Gibson U. Haud S. Janowiecki P. M. W. Kalberla F. J. Lockman N. M. McClure-Griffiths T. Murphy H. Nakanishi D. J. Pisano L. Staveley-Smith
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keywords surveyhi4piall-skyebhisgalacticgassangularatomic
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Measurement of the Galactic neutral atomic hydrogen (HI) column density, NHI, and brightness temperatures, Tb, is of high scientific value for a broad range of astrophysical disciplines. In the past two decades, one of the most-used legacy HI datasets has been the Leiden/Argentine/Bonn Survey (LAB). We release the HI 4$\pi$ survey (HI4PI), an all-sky database of Galactic HI, which supersedes the LAB survey. The HI4PI survey is based on data from the recently completed first coverage of the Effelsberg-Bonn HI Survey (EBHIS) and from the third revision of the Galactic All-Sky Survey (GASS). EBHIS and GASS share similar angular resolution and match well in sensitivity. Combined, they are ideally suited to be a successor to LAB. The new HI4PI survey outperforms the LAB in angular resolution (16.2', FWHM) and sensitivity (RMS: 43 mK). Moreover, it has full spatial sampling and thus overcomes a major drawback of LAB, which severely undersamples the sky. We publish all-sky column density maps of the neutral atomic hydrogen in the Milky Way, along with full spectroscopic data, in several map projections including HEALPix.

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