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Date and Time of the Query: 2019-06-26 T07:35:13 PDT
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For refcode 2010AJ....140..663G:
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2010AJ....140..663G The Slope of the Baryonic Tully-Fisher Relation Gurovich, Sebastian; Freeman, Kenneth; Jerjen, Helmut; Staveley-Smith, Lister; Puerari, Ivanio Abstract. We present the results of a baryonic Tully-Fisher relation (BTFR) study for a local sample of relatively isolated disk galaxies. We derive a BTFR with a slope near 3 measured over about 4 dex in baryon mass for our combined H I and bright spiral disk samples. This BTFR is significantly flatter and has less scatter than the TFR (stellar mass only) with its slope near 4 reported for other samples and studies. A BTFR slope near 3 is in better agreement with the expected slope from simple \LambdaCDM cosmological simulations that include both stellar and gas baryons. The scatter in the TFR/BTFR appears to depend on W_20_: galaxies that rotate slower have more scatter. The atomic gas-to-stars ratio shows a break near W_20_ = 250 km s^--1^ probably associated with a change in star formation efficiency. In contrast, the absence of such a break in the BTFR suggests that this relation was probably set at the main epoch of baryon dissipation rather than as a product of later galactic evolution. Key words: cosmology: observations, dark matter, galaxies: evolution, galaxies: formation
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