Deep investigation of neutral gas origins (DINGO): H i stacking experiments with early science data. Issue 3 (26th October 2022)

• Record Type: Journal Article
• Authors: Rhee, Jonghwan; Meyer, Martin; Popping, Attila; Bellstedt, Sabine; Driver, Simon P; Robotham, Aaron S G; Whiting, Matthew; Baldry, Ivan K; Brough, Sarah; Brown, Michael J I; Bunton, John D; Dodson, Richard; Holwerda, Benne W; Hopkins, Andrew M; Koribalski, Bärbel S; Lee-Waddell, Karen; López-Sánchez, Ángel R; Loveday, Jon; Mahony, Elizabeth; Roychowdhury, Sambit; Rozgonyi, Kristóf; Staveley-Smith, Lister
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 518:Issue 3(2023)
• Page Start: 4646
• Page End: 4671
• Publication Date: 2022-10-26
• Subjects: galaxies: evolution -- galaxies: ISM -- radio lines: galaxies; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac3065
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present early science results from Deep Investigation of Neutral Gas Origins (DINGO), an $\rm H$ i survey using the Australian Square Kilometre Array Pathfinder (ASKAP). Using ASKAP subarrays available during its commissioning phase, DINGO early science data were taken over ∼60 deg 2 of the Galaxy And Mass Assembly (GAMA) 23 h region with 35.5 h integration time. We make direct detections of six known and one new sources at z < 0.01. Using $\rm H$ i spectral stacking, we investigate the $\rm H$ i gas content of galaxies at 0.04 < z < 0.09 for different galaxy colours. The results show that galaxy morphology based on optical colour is strongly linked to $\rm H$ i gas properties. To examine environmental impacts on the $\rm H$ i gas content of galaxies, three subsamples are made based on the GAMA group catalogue. The average $\rm H$ i mass of group central galaxies is larger than those of satellite and isolated galaxies, but with a lower $\rm H$ i gas fraction. We derive a variety of $\rm H$ i scaling relations for physical properties of our sample, including stellar mass, stellar mass surface density, NUV − r colour, specific star formation rate, and halo mass. We find that the derived $\rm H$ i scaling relations are comparable to other published results, with consistent trends also observed to ∼0.5 dex lower limits in stellar mass and stellar surface density. The cosmic $\rm H$ i densities derived from our data are consistent with other published values at similar redshifts. DINGO early science highlights the power of $\rm H$ i spectral stacking techniques with ASKAP.