WALLABY Pilot Survey: the Tully-Fisher relation in the NGC 4808, Vela and NGC 5044 fields

TL;DR

This study uses high-quality HI 21-cm spectra from the WALLABY pilot survey to analyze the Tully-Fisher relation across multiple wavelengths, aiming to improve galaxy distance estimates and contribute to understanding the local velocity field.

Contribution

It investigates the Tully-Fisher relation using WALLABY pilot data across various wavelengths and galaxy catalogs, preparing for the full survey's application to large galaxy samples.

Findings

WALLABY TFR distances are comparable to state-of-the-art local velocity field studies.

The study demonstrates the feasibility of TFR analysis with ASKAP data for large galaxy samples.

Multiple wavelength TFRs are characterized, including baryonic TFRs.

Abstract

The Tully-Fisher Relation (TFR) is a well-known empirical relationship between the luminosity of a spiral galaxy and its circular velocity, allowing us to estimate redshift independent distances. Here we use high signal-to-noise HI 21-cm integrated spectra from the second pilot data release (PDR2, 180 deg2) of the Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY). In order to prepare for the full WALLABY survey, we have investigated the TFR in phase 2 of the pilot survey with a further three fields. The data were obtained with wide-field Phased Array Feeds on the Australian Square Kilometre Array Pathfinder (ASKAP) and have an angular resolution of 30 arcsec and a velocity resolution of ~4 km/s. Galaxy luminosities have been measured from the Wide-field Infrared Survey Explorer (WISE), and optical galaxy inclinations from the Dark Energy Camera Legacy Survey. We present TFRs for wavelengths from 0.8-3.4{\mu}m. We examine sources of galaxy inclination data and investigate magnitudes from the DECam Local Volume Exploration Survey (DELVE) and DENIS catalogues and the 4HS target catalogue based on the VISTA Hemisphere Survey (VHS). We consider the baryonic TFR. These are all of interest for TFR using the full WALLABY survey of 200,000 galaxies. We demonstrate that WALLABY TFR distances can take their place among state of the art studies of the local velocity field.