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This content will become publicly available on June 20, 2026

Title: Measuring Scaling Relations: Fitting Technique Matters
Abstract Scaling relationships, both integrated and spatially resolved, arise owing to the physical processes that govern galaxy evolution and are frequently measured in both observed and simulated data. However, the accuracy and comparability of these measurements are hindered by various differences between studies such as spatial resolution, sample selection criteria, and fitting technique. In this Letter, we compare variations of standard least-squares techniques to the ridge line method for identifying spatially resolved scaling relations (Σ*−ΣSFR, Σ*−Σgas, and Σgas−ΣSFR) for TNG100 galaxies. We find that using the ridge line technique to fit these scaling relations with a double linear function (in logarithmic space) results in significantly better fits than fitting with ordinary least squares. We further illustrate the utility of the ridge line technique with an investigation into the dependence of resolved star formation main-sequence (rSFMS) measurements on spatial resolution and smoothing scale. Specifically, we find that the slope of the rSFMS at low Σ*is independent (within 2σ) of spatial resolution and smoothing scale. Finally, we discuss the need for a consistent reanalysis of resolved scaling relations in the literature and physically motivate adoption of the ridge line technique over other fitting methods.  more » « less
Award ID(s):
2009397
PAR ID:
10629637
Author(s) / Creator(s):
; ;
Publisher / Repository:
The Astrophysical Journal
Date Published:
Journal Name:
The Astrophysical Journal Letters
Volume:
986
Issue:
2
ISSN:
2041-8205
Page Range / eLocation ID:
L32
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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