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Title: Weighing galaxy disks with the baryonic Tully–Fisher relation

Abstract

We estimate the stellar masses of disk galaxies with two independent methods: a photometrically self-consistent color–mass-to-light ratio relation (CMLR) from population synthesis models, and the baryonic Tully–Fisher relation (BTFR) calibrated by gas-rich galaxies. These two methods give consistent results. The CMLR correctly converts distinct Tully–Fisher relations in different bands into the same BTFR. The BTFR is consistent with M{sub b}∝V{sub f}{sup 4} over nearly six decades in mass, with no hint of a change in slope over that range. The intrinsic scatter in the BTFR is negligible, implying that the IMF of disk galaxies is effectively universal. The gas-rich BTFR suggests an absolute calibration of the stellar mass scale that yields nearly constant mass-to-light ratios in the near-infrared (NIR): 0.57 M/L in K{sub s} and 0.45 M/L at 3.6 μm. There is only modest intrinsic scatter (∼0.12 dex) about these typical values. There is no discernible variation with color or other properties: the NIR luminosity is a good tracer of stellar mass.

Authors:
 [1]
  1. Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106 (United States)
Publication Date:
OSTI Identifier:
22882617
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 802; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; Journal ID: ISSN 0004-637X
Country of Publication:
United Kingdom
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; CALIBRATION; GALACTIC EVOLUTION; GALAXIES; LUMINOSITY; MASS; PHOTOMETRY

Citation Formats

McGaugh, Stacy S., and Schombert, James M., E-mail: stacy.mcgaugh@case.edu, E-mail: jschombe@uoregon.edu. Weighing galaxy disks with the baryonic Tully–Fisher relation. United Kingdom: N. p., 2015. Web. doi:10.1088/0004-637X/802/1/18.
McGaugh, Stacy S., & Schombert, James M., E-mail: stacy.mcgaugh@case.edu, E-mail: jschombe@uoregon.edu. Weighing galaxy disks with the baryonic Tully–Fisher relation. United Kingdom. https://doi.org/10.1088/0004-637X/802/1/18
McGaugh, Stacy S., and Schombert, James M., E-mail: stacy.mcgaugh@case.edu, E-mail: jschombe@uoregon.edu. Fri . "Weighing galaxy disks with the baryonic Tully–Fisher relation". United Kingdom. https://doi.org/10.1088/0004-637X/802/1/18.
@article{osti_22882617,
title = {Weighing galaxy disks with the baryonic Tully–Fisher relation},
author = {McGaugh, Stacy S. and Schombert, James M., E-mail: stacy.mcgaugh@case.edu, E-mail: jschombe@uoregon.edu},
abstractNote = {We estimate the stellar masses of disk galaxies with two independent methods: a photometrically self-consistent color–mass-to-light ratio relation (CMLR) from population synthesis models, and the baryonic Tully–Fisher relation (BTFR) calibrated by gas-rich galaxies. These two methods give consistent results. The CMLR correctly converts distinct Tully–Fisher relations in different bands into the same BTFR. The BTFR is consistent with M{sub b}∝V{sub f}{sup 4} over nearly six decades in mass, with no hint of a change in slope over that range. The intrinsic scatter in the BTFR is negligible, implying that the IMF of disk galaxies is effectively universal. The gas-rich BTFR suggests an absolute calibration of the stellar mass scale that yields nearly constant mass-to-light ratios in the near-infrared (NIR): 0.57 M/L in K{sub s} and 0.45 M/L at 3.6 μm. There is only modest intrinsic scatter (∼0.12 dex) about these typical values. There is no discernible variation with color or other properties: the NIR luminosity is a good tracer of stellar mass.},
doi = {10.1088/0004-637X/802/1/18},
url = {https://www.osti.gov/biblio/22882617}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 802,
place = {United Kingdom},
year = {2015},
month = {3}
}