THE SMALL SCATTER OF THE BARYONIC TULLY–FISHER RELATION
By F. Lelli, S. McGaugh, J. Schombert. 2015
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In a Λ cold dark matter (ΛCDM) cosmology, the baryonic Tully–Fisher relation (BTFR) is expected to show significant intrinsic scatter resulting from the mass–concentration relation of dark matter halos and the baryonic-to-halo mass ratio. We study the BTFR using a sample of 118 disk galaxies (spirals and irregulars) with data of the highest quality: extended H I ?> rotation curves (tracing the outer velocity) and Spitzer photometry at 3.6 μm (tracing the stellar mass). Assuming that the stellar mass-to-light ratio ( ϒ * ?> ) is nearly constant at 3.6 μm, we find that the scatter, slope, and normalization of the BTFR systematically vary with the adopted ϒ * ?> . The observed scatter is minimized for ϒ * ≳ 0.5 ?> M ⊙ / L ⊙ ?> , corresponding to nearly maximal disks in high-surface-brightness galaxies and BTFR slopes close to ∼4. For any reasonable value of ϒ * ?> , the intrinsic scatter is ∼0.1 dex, below general ΛCDM expectations. The residuals show no correlations with galaxy structural parameters (radius or surface brightness), contrary to the predictions from some semi-analytic models of galaxy formation. These are fundamental issues for ΛCDM cosmology.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/b770bd128353d3ebfd4aa6468ab1524a37f7ca3a
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Citations in the corpus
- Small scale problems of the $\Lambda$CDM model: a short review (2016, methodology): “It has therefore been generalised by using baryonic mass instead of just stellar mass, and the resulting Baryonic Tully-Fisher Relation (BTFR) fits well with a single power law over several orders of magnitude [67] and with small scatter for selected high-quality data [70,122].”