WALLABY Pilot Survey: Public release of HI kinematic models for more than 100 galaxies from phase 1 of ASKAP pilot observations

Deg, Nathan; Spekkens, Kristine; Westmeier, T.; Reynolds, T. N.; Venkataraman, P.; Goliath, S.; Shen, Alan; Halloran, R.; Bosma, A.; Catinella, Barbara; Blok, W. J. G. de; Dénes, H.; Teodoro, Enrico M. Di; Elagali, Ahmed; For, Bi-Qing; Howlett, Cullan; Józsa, G. I. G.; Kamphuis, P.; Kleiner, D.; Koribalski, B. S.; Lee-Waddell, K.; Lelli, Federico; Lin, Xuchen; Murugeshan, C.; Oh, Se–Heon; Rhee, J.; Scott, T. C.; Hulst, J. M. van der; Verdes–Montenegro, L.; Wang, J.; Wong, O. Ivy

doi:10.1017/pasa.2022.43

Cited by 8 publications

(4 citation statements)

References 59 publications

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“…This is a rough filter and a number of galaxies with poorly constructed masks still fall into the sample. As noted earlier, ell maj ∼D HI /2 when using WALLABY-like parameters (Deg et al 2022 ).…”

Section: P Ot E N T I a L F O R Wa L L A B Y-l I K E O B S E Rvat I O...supporting

confidence: 58%

“…This is a relatively straightforward approach, but the point that minimizes the asymmetry does not necessarily correspond to a physically meaningful location like the dynamical centre of the galaxy, which can be estimated from the 3D data sets that are the focus of this work (e.g. Deg et al 2022 ;Westmeier et al 2022 ).…”

Section: Dmentioning

confidence: 99%

“…To give an idea of the scale of these variations we assumed an uncertainty of ±0.25 beams and ±1 channels (typical for H I datacubes from wide-field surv e ys, e.g. Deg et al 2022 ) for the centre of the mock cube used in the mask tests shown in Fig. 5 .…”

Section: Measurement Valuementioning

confidence: 99%

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Measuring galaxy asymmetries in 3D

Deg

Perron-Cormier

Spekkens

et al. 2023

Monthly Notices of the Royal Astronomical Society

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One of the commonly used non-parametric morphometric statistics for galaxy profiles and images is the asymmetry statistic. With an eye to current and upcoming large neutral hydrogen (H i) surveys, we develop a 3D version of the asymmetry statistic that can be applied to datacubes. This statistic is more resilient to variations due to the observed geometry than 1D asymmetry measures, and can be successfully applied to lower spatial resolutions (3-4 beams across the galaxy major axis) than the 2D statistic. We have also modified the asymmetry definition from an ‘absolute difference’ version to a ‘squared difference’ version that removes much of the bias due to noise contributions for low signal-to-noise observations. Using a suite of mock asymmetric cubes we show that the background-corrected, squared difference 3D asymmetry statistic can be applied to many marginally resolved galaxies in large wide-area H i surveys such as WALLABY on the Australian SKA Pathfinder (ASKAP).

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Section: P Ot E N T I a L F O R Wa L L A B Y-l I K E O B S E Rvat I O...supporting

confidence: 58%

Section: Dmentioning

confidence: 99%

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Measuring galaxy asymmetries in 3D

Deg

Perron-Cormier

Spekkens

et al. 2023

Monthly Notices of the Royal Astronomical Society

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“…(3DBAROLO;Di Teodoro & Fraternali 2015) and a modified version of the WALLABY Kinematic Analysis Proto-Pipeline (WKAPP;Deg et al 2022). …”

mentioning

confidence: 99%

WALLABY Pilot Survey: H i in the Host Galaxy of a Fast Radio Burst

Glowacki

Lee-Waddell

Deller

et al. 2023

ApJ

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We report on the commensal ASKAP detection of a fast radio burst (FRB), FRB 20211127I, and the detection of neutral hydrogen (H i) emission in the FRB host galaxy, WALLABY J131913–185018 (hereafter W13–18). This collaboration between the CRAFT and WALLABY survey teams marks the fifth, and most distant, FRB host galaxy detected in H i, not including the Milky Way. We find that W13–18 has an H i mass of M HI = 6.5 × 109 M ⊙, an H i-to-stellar mass ratio of 2.17, and coincides with a continuum radio source of flux density at 1.4 GHz of 1.3 mJy. The H i global spectrum of W13–18 appears to be asymmetric, albeit the H i observation has a low signal-to-noise ratio (S/N), and the galaxy itself appears modestly undisturbed. These properties are compared to the early literature of H i emission detected in other FRB hosts to date, where either the H i global spectra were strongly asymmetric, or there were clearly disrupted H i intensity map distributions. W13–18 lacks a sufficient S/N to determine whether it is significantly less asymmetric in its H i distribution than previous examples of FRB host galaxies. However, there are no strong signs of a major interaction in the optical image of the host galaxy that would stimulate a burst of star formation and hence the production of putative FRB progenitors related to massive stars and their compact remnants.

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WALLABY pilot survey: the potential polar ring galaxies NGC 4632 and NGC 6156

Deg,

Palleske,

Spekkens

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We report on the discovery of two potential polar ring galaxies (PRGs) in the WALLABY Pilot Data Release 1 (PDR1). These untargeted detections, cross-matched to NGC 4632 and NGC 6156, are some of the first galaxies where the H i observations show two distinct components. We used the iDaVIE virtual reality software to separate the anomalous gas from the galactic gas and found that the anomalous gas comprises ∼50 per cent of the total H i content of both systems. We have generated plausible 3D kinematic models for each galaxy, assuming that the rings are circular and inclined at 90° to the galaxy bodies. These models show that the data are consistent with PRGs but do not definitively prove that the galaxies are PRGs. By projecting these models at different combinations of main disc inclinations, ring orientations, and angular resolutions in mock data cubes, we have further investigated the detectability of similar PRGs in WALLABY. Assuming that these galaxies are indeed PRGs, the detectability fraction, combined with the size distribution of WALLABY PDR1 galaxies, implies an incidence rate of ∼1–3 per cent. If this rate holds true, the WALLABY survey will detect hundreds of new polar ring galaxies.

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WALLABY Pilot Survey: Public release of HI kinematic models for more than 100 galaxies from phase 1 of ASKAP pilot observations

Cited by 8 publications

References 59 publications

Measuring galaxy asymmetries in 3D

Measuring galaxy asymmetries in 3D

WALLABY Pilot Survey: H i in the Host Galaxy of a Fast Radio Burst

WALLABY pilot survey: the potential polar ring galaxies NGC 4632 and NGC 6156

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