A break in the high-redshift stellar mass Tully-Fisher relation

作者：Christensen Lise^*; Hjorth Jens

来源：Monthly Notices of the Royal Astronomical Society, 2017, 470(3): 2599-2610.

DOI：10.1093/mnras/stx1390

• galaxies: evolution
• galaxies: fundamental parameters
• galaxies: high-redshift
• galaxies: kinematics and dynamics

We investigate the stellar-mass Tully-Fisher relation (TFR) between the stellar mass and the integrated gas velocity dispersion, quantified by the kinematic estimator S-0.5 measured from strong emission lines in spectra of galaxies at 0 < z < 5. We combine luminosity-selected galaxies ('high-luminosity sample') with galaxies selected in other ways ('low-luminosity sample') to cover a range in stellar mass that spans almost five orders of magnitude: 7.0 less than or similar to log M-M-circle dot less than or similar to 11.5. We find that the logarithmic power-law slope and normalization of the TFR are independent of redshift out to z similar to 3. The scatter in the TFR is < 0.5 dex such that the gas velocity dispersion can be used as a proxy for the stellar mass of a galaxy independently of its redshift. At z > 3, the scatter increases and the existence of a correlation is not obvious. The high-luminosity sample exhibits a flatter slope of 1.5 +/- 0.2 at z < 3 compared to the low-luminosity sample slope of 2.9 +/- 0.3, suggesting a turnover in the TFR. The combined sample is well fit with a break in the TFR at a characteristic stellar-mass scale of M-* similar to 10(10) M-circle dot, with no significant evolution out to z similar to 3. We demonstrate that a break in the TFR with a steeper slope at the low-mass end is a natural consequence of galaxy models with a mass-dependent stellar-to-halo mass ratio.

• 出版日期2017-9