VizieR Online Data Catalog: ~420MHz uGMRT obs. of MIR selected radio-loud AGN (Gupta+, 2021)
Abstract
In this paper, we present a spectroscopically blind search of HI 21cm absorption at z>2 based on a sample of AGN selected using the MIR colors from the Wide-field Infrared Survey Explorer (WISE) and having spectroscopically confirmed redshifts using the Southern African Large Telescope (SALT; 180hr) and the Nordic Optical Telescope (NOT; 6 nights; Krogager+ 2018ApJS..235...10K).
These AGN are being observed as part of the MeerKAT Absorption Line Survey (MALS), which is a large project at the MeerKAT array in South Africa, to search HI 21cm and OH 18cm lines at z<2. In 2018 April 21 and during six observing runs in September, we used the recently commissioned Band 2 (120-240MHz) and Band 3 (250-500MHz) of the upgraded Giant Metrewave Radio Telescope (uGMRT) to observe redshifted associated and intervening HI 21cm absorption lines from the 88 AGN selected from the SALT-NOT sample. Additionally, five absorption candidates identified from the Band 3 survey observations were reobserved on 2019 December 10 and 2020 February 20. (1 data file).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- October 2021
- DOI:
- 10.26093/cds/vizier.22550028
- Bibcode:
- 2021yCat..22550028G
- Keywords:
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- Active gal. nuclei;
- Redshifts;
- Optical;
- Spectroscopy;
- Radio lines;
- Infrared sources