A deep ALMA Band 3 survey of HDFS/MUSE3D: Survey description and initial results
Hugo Messias, Laura Gomez, Harold Francke, Bill Dent, Bel\'en Alcalde Pampliega, Ruediger Kneissl, Yiqing Song, Dirk Petry, Paulo Cort\'es, Sergio Mart\'in

TL;DR
This paper presents a deep 3mm ALMA survey of the Hubble Deep Field South, revealing molecular gas properties in galaxies at z>1, with initial detections of line emitters and insights into gas mass densities in group environments.
Contribution
It introduces a high-resolution, deep ALMA Band 3 survey targeting galaxy groups at z>1, providing new molecular gas measurements and environmental comparisons.
Findings
Detected six CO J=2-1 line emitters at z=1.284
Identified three 3mm continuum sources, one new
Derived molecular gas mass densities comparable to field environments
Abstract
(abridged) After more than 10yr of ALMA operations, the community interest in conducting deep, extra-galactic, millimetre surveys resulted in varying strategic compromises between areal size and map depth to survey the sky. The current bias leans towards a galaxy population found in the field or towards rich star-bursty proto-cluster groups, both tendentiously surveyed at coarse spatial resolutions. Here, we describe a deep 3mm ALMA survey in long-baselines on a 1x1arcmin2 region in the Hubble Deep Field South, also covered by the Multi Unit Spectroscopic Explorer (MUSE) in order to assess resolved molecular gas properties in galaxies in group environments at z>1. ALMA observations comprising a 4-pointing mosaic with a single Band3 (3mm) spectral tuning were conducted to cover CO transitions from different groups identified by MUSE. This work consists in a total effective time on source…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies
