The DESI DR1 Peculiar Velocity Survey: The Tully-Fisher Distance Catalog

TL;DR

This paper calibrates the Tully-Fisher relation using DESI DR1 data for over 10,000 spiral galaxies, providing a catalog of distances and velocities crucial for cosmological studies.

Contribution

It introduces a new calibration of the Tully-Fisher relation based on DESI DR1 data and provides a comprehensive catalog of galaxy distances and peculiar velocities.

Findings

Calibrated TFR slope of -7.22+/-0.01 AB mag in r-band.

Intrinsic scatter of 0.466+/-0.001 AB mag.

Catalog of distances and peculiar velocities for 10,262 galaxies.

Abstract

We calibrate the Tully-Fisher relation (TFR) using observations of spiral galaxies taken during the first year (DR1) of the DESI galaxy redshift survey. The rotational velocities of 10,262 galaxies are measured at 0.4 R26 by comparing the redshifts at 0.4 R26 with those at the galaxy centers of spatially-resolved galaxies targeted as part of the DESI Peculiar Velocity Survey. The DESI DR1 TFR slope is calibrated by separating the spiral galaxies into redshift bins of width dz = 0.005 from 0.03 < z < 0.1 and jointly fitting the TFR across all bins. We find a slope of -7.22+/-0.01 AB mag in the r-band for the TFR, with an intrinsic scatter of 0.466+/-0.001 AB mag. We present a catalog of the distances and peculiar velocities to these 10,262 galaxies using our calibrated TFR. For cosmological analyses, we also present a clustering catalog and associated random catalogs using a subset of 6807 of the DESI DR1 TF galaxies.