The Arecibo Galaxy Environment Survey (AGES): XI. The expanded Abell 1367 field: Data catalogue and H I census over the surveyed volume

Abstract

Context. Many galaxy properties are known to correlate with the environment in which the galaxies are embedded. Their cold, neutral gas content, which is usually assessed through 21 cmHI observations, is related to many other galaxy properties as it is the underlying fuel for star formation. With its high sensitivity and broad sky coverage the blind Arecibo Galaxy Environment Survey (AGES) brings significant improvement to the census of HI properties of galaxies in a wide range of environments, from voids to the core of a massive cluster. Here we present an HI census over a volume of 44 000 Mpc3 towards the merging cluster Abell 1367 and extending well beyond. Aims. We measure the effects that different environments have on the HI content of their constituent galaxies. Methods. We use AGES- a deep, blind, H ¯I survey carried out with the Arecibo radio telescope, which covers 20 square degrees on the sky centred on the merging cluster Abell 1367, mapping the large-scale structure (LSS) surrounding the cluster out to cz=20000 km s1. The survey is sensitive down to a column density of NHI = 1.5 ÃÂ - 1017 cm2 for emission filling the beam and a line width of 10 km s1. As an approximate mass sensitivity limit, a member of A1367 (at a distance of 92 Mpc), containing MHI = 2.7 ÃÂ - 108 Mdistributed over a top-hat profile of 50 km s1 width would be detected at 4. The results are analysed in combination with optical spectroscopy data from SDSS which we use to estimate the local galaxy density based on the Voronoi-Delaunay method. Results. We present the results of the complete AGES survey of the A1367 field. In total, we detect 457 HI sources, 213 of which are detected for the first time by the AGES survey, and 134 of which are presented in this article for the first time. Of the 457 detections, 225 are in the cluster and 232 are in the remaining volume surveyed. Here we present the full catalogue of HI detections and their basic properties, including optical ones. We concentrate on the difference between the cluster and the foreground and background LSS, revealing a continuous correlation of HI-detected fraction (and HI deficiency) with local galaxy density, independent of global environment.