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

TL;DR

This paper presents the first public release of HI kinematic models for over 100 galaxies from the WALLABY Pilot Survey, demonstrating a pipeline for analyzing large HI datasets to facilitate future galaxy studies.

Contribution

It introduces the WALLABY Kinematic Analysis Proto-Pipeline (WKAPP) for generating and releasing HI kinematic models from ASKAP observations, enabling large-scale, homogeneous galaxy analysis.

Findings

109 HI kinematic models released for galaxies in Hydra, Norma, and NGC 4636 fields

Models are based on high-resolution, high S/N detections with at least 3-4 beams across the galaxy

Pipeline sets the stage for analyzing thousands of galaxies in future WALLABY data

Abstract

We present the Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) Pilot Phase I HI kinematic models. This first data release consists of HI observations of three fields in the direction of the Hydra and Norma clusters, and the NGC 4636 galaxy group. In this paper, we describe how we generate and publicly release flat-disk tilted-ring kinematic models for 109/592 unique HI detections in these fields. The modelling method adopted here - which we call the WALLABY Kinematic Analysis Proto-Pipeline (WKAPP) and for which the corresponding scripts are also publicly available - consists of combining results from the homogeneous application of the FAT and 3DBAROLO algorithms to the subset of 209 detections with sufficient resolution and S/N in order to generate optimized model parameters and uncertainties. The 109 models presented here tend to be gas rich detections resolved by at least 3-4 synthesized beams across their major axes, but there is no obvious environmental bias in the modelling. The data release described here is the first step towards the derivation of similar products for thousands of spatially-resolved WALLABY detections via a dedicated kinematic pipeline. Such a large publicly available and homogeneously analyzed dataset will be a powerful legacy product that that will enable a wide range of scientific studies.