Year: 2025
Type: article
Abstract: We present follow-up 21 cm H I line observations made with the Nançay Radio Telescope (NRT) of 99 weak or potential detections of galaxies from the EZOA catalogue in the northern Zone of Avoidance (ZoA), which were extracted from the shallow version of the EBHIS blind H I survey performed with the Effelsberg radio telescope. The new NRT observations are on average almost three times as sensitive as those from EBHIS. Of the 99 observed sources, we confirmed 72, while three yielded inconclusive results. We find that the quality assessment of the EZOA catalogue entries correlates well with the NRT recovery rate; for instance, only four of the 22 potential detections could be confirmed. Due to the higher sensitivity as well as the large north-south extent of the NRT beam, the NRT observations also yielded five serendipitous detections, which we include here. We updated the EZOA catalogue with the improved H I parameters and detections. To test the mitigation of radio frequency interference signals, we also observed selected sources using a dedicated receiver and data processing system.
Source: Astronomy and Astrophysics
Institutions: Max Planck Institute for Extraterrestrial Physics, Université d'Orléans, Centre National de la Recherche Scientifique, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Observatoire Radioastronomique de Nançay, University of Cape Town, Université Paris Cité
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
OpenAlex ID: W4407231966