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A comparison of the baryonic Tully-Fisher relation in MaNGA and IllustrisTNG
Journal article   Open access   Peer reviewed

A comparison of the baryonic Tully-Fisher relation in MaNGA and IllustrisTNG

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, v 520(3), p3895
15 Feb 2023
url
https://arxiv.org/pdf/2302.05029View
url
https://doi.org/10.1093/mnras/stad298View
Published, Version of Record (VoR) Open

Abstract

We compare an observed baryonic Tully-Fisher relation (BTFR) from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) and HI-MaNGA surveys to a simulated BTFR from the cosmological magnetohydrodynamical simulation, IllustrisTNG. To do so, we calibrate the BTFR of the local universe using 377 galaxies from the MaNGA and HI-MaNGA surveys, and perform mock 21 cm observations of matching galaxies from IllustrisTNG. The mock observations are used to ensure that the comparison with the observed galaxies is fair since it has identical measurement algorithms, observational limitations, biases, and uncertainties. For comparison, we also calculate the BTFR for the simulation without mock observations and demonstrate how mock observations are necessary to fairly and consistently compare between observational and theoretical data. We report a MaNGA BTFR of log(10) (M-Bary/M-circle dot) = (2.97 +/- 0.18) log(10)V(Rot) + (4.04 +/- 0.41) log(10) M-circle dot and an IllustrisTNG BTFR of log(10) (M Bary/M-circle dot) = (2.94 +/- 0.23) log(10) V-Rot + (4.15 +/- 0.44) log(10) M-circle dot. Thus, MaNGA and IllustrisTNG produce BTFRs that agree within uncertainties, demonstrating that IllustrisTNG has created a galaxy population that obeys the observed relationship between mass and rotation velocity in the observed universe.

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Astronomy & Astrophysics
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