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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The Westerbork Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) survey: I. Survey description and pilot observations
Astronomy and Astrophysics, Volume 526, No. 15, Article A118, Year 2011
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Description
We introduce a new, very deep neutral hydrogen (H i) survey being performed with the Westerbork Synthesis Radio Telescope (WSRT). The Westerbork Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) Survey is producing an archive of some of the most sensitive H i observations available, on the angular scales which are most useful for studying faint, diffuse gas in and around nearby galaxies. The survey data are being used to perform careful modeling of the galaxies, characterizing their gas content, morphology, and kinematics, with the primary goal of revealing the global characteristics of cold gas accretion onto spiral galaxies in the local Universe. In this paper, we describe the survey sample selection, the data acquisition, reduction, and analysis, and present the data products obtained during our pilot program, which consists of UGC 2082, NGC 672, NGC 925, and NGC 4565. The observations reveal a first glimpse of the picture that the full HALOGAS project aims to illuminate: the properties of accreting H i in different types of spirals, and across a range of galactic environments. None of the pilot survey galaxies hosts an H i halo of the scale of NGC 891, but all show varying indications of halo gas features. We compare the properties of detected features in the pilot survey galaxies with their global characteristics, and discuss similarities and differences with NGC 891 and NGC 2403. © ESO, 2011.
Authors & Co-Authors
Heald, George H.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Józsa, Gyula I.G.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Serra, Paolo
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Zschaechner, Laura K.
United States, Albuquerque
The University of new Mexico
Rand, Richard J.
United States, Albuquerque
The University of new Mexico
Fraternali, Filippo
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Oosterloo, Thomas A.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Groningen
Kapteyn Instituut
Walterbos, René A.M.
United States, Las Cruces
New Mexico State University
Jütte, Eva
Germany, Bochum
Ruhr-universitat Bochum
Gentile, Gianfranco
Belgium, Ghent
Universiteit Gent
Statistics
Citations: 147
Authors: 10
Affiliations: 7
Identifiers
Doi:
10.1051/0004-6361/201015938
ISSN:
00046361
Study Design
Cross Sectional Study
Study Approach
Quantitative