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The Extended Baryonic Tully-Fisher Relation for MaNGA Galaxies
Authors:
Nitya Ravi,
Kelly A. Douglass,
Regina Demina
Abstract:
The baryonic Tully-Fisher relation (BTFR), a relationship between rotational velocity and baryonic mass in spiral galaxies, probes the relative content of baryonic and dark matter in galaxies and thus provides a good test of Lambda CDM. Using H-alpha kinematics to model the rotation curves of spiral galaxies, we construct the BTFR for 5743 SDSS MaNGA DR17 galaxies. To extend the BTFR to higher mas…
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The baryonic Tully-Fisher relation (BTFR), a relationship between rotational velocity and baryonic mass in spiral galaxies, probes the relative content of baryonic and dark matter in galaxies and thus provides a good test of Lambda CDM. Using H-alpha kinematics to model the rotation curves of spiral galaxies, we construct the BTFR for 5743 SDSS MaNGA DR17 galaxies. To extend the BTFR to higher masses using elliptical galaxies, we estimate their total masses from their stellar velocity dispersions using the virial theorem and define the effective rotational velocity as the velocity a rotation-supported galaxy would exhibit given this mass. The baryonic mass of spiral galaxies is composed of stellar, HI, H2, and He mass, while only the stellar mass is used for the baryonic content of ellipticals. We construct and fit the BTFR for a matched subsample of spiral and elliptical MaNGA and IllustrisTNG 100-1 (TNG100) galaxies, finding BTFR slopes between 3.2 and 4.0. We fit a joint BTFR for the 5743 MaNGA spiral and elliptical galaxies and find a BTFR slope of 3.54 (+0.65/-0.48), which is in good agreement with TNG100 galaxies with baryonic masses greater than 10^9 Msun for which we find a BTFR slope of 3.57 (+0.48/-0.37). Within this mass range, the MaNGA galaxies are consistent with both the Lambda CDM simulation and the prediction from MOND; a sample of lower mass galaxies is necessary to differentiate between the two models.
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Submitted 20 December, 2025;
originally announced December 2025.
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The DESI DR1 Peculiar Velocity Survey: The Tully-Fisher Distance Catalog
Authors:
K. Douglass,
S. BenZvi,
A. G. Kim,
S. Moore,
A. Carr,
J. Largett,
N. Ravi,
J. Aguilar,
S. Ahlen,
A. J. Amsellem,
J. Bautista,
D. Bianchi,
C. Blake,
D. Brooks,
T. Claybaugh,
A. Cuceu,
A. de la Macorra,
R. Demina,
P. Doel,
S. Ferraro,
A. Font-Ribera,
J. E. Forero-Romero,
E. Gaztanaga,
S. Gontcho A Gontcho,
G. Gutierrez
, et al. (42 additional authors not shown)
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 slop…
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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.
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Submitted 2 December, 2025;
originally announced December 2025.
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A Full Accounting of the Visible Mass in SDSS MaNGA Disk Galaxies
Authors:
Nitya Ravi,
Kelly A. Douglass,
Regina Demina
Abstract:
We present a study of the ratio of visible mass to total mass in spiral galaxies to better understand the relative amount of dark matter present in galaxies of different masses and evolutionary stages. Using the velocities of the H-alpha emission line measured in spectroscopic observations from the Sloan Digital Sky Survey (SDSS) MaNGA Data Release 17 (DR17), we evaluate the rotational velocity of…
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We present a study of the ratio of visible mass to total mass in spiral galaxies to better understand the relative amount of dark matter present in galaxies of different masses and evolutionary stages. Using the velocities of the H-alpha emission line measured in spectroscopic observations from the Sloan Digital Sky Survey (SDSS) MaNGA Data Release 17 (DR17), we evaluate the rotational velocity of over 5500 disk galaxies at their 90% elliptical Petrosian radii, R90. We compare this to the velocity expected from the total visible mass, which we compute from the stellar, HI, molecular hydrogen, and heavy metals and dust masses. Molecular hydrogen mass measurements are available for only a small subset of galaxies observed in SDSS MaNGA DR17, so we derive a parameterization of the molecular hydrogen mass as a function of absolute magnitude in the r band using galaxies observed as part of SDSS DR7. With these parameterizations, we calculate the fraction of visible mass within R90 that corresponds to the observed velocity. Based on statistically analyzing the likelihood of this fraction, we conclude that the null hypothesis (no dark matter) cannot be excluded at a confidence level better than 95% within the visible extent of the disk galaxies. We also find that when all mass components are included, the ratio of visible-to-total mass within the visible extent of star-forming disk galaxies increases with galaxy luminosity.
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Submitted 20 June, 2024; v1 submitted 17 October, 2023;
originally announced October 2023.