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arXiv 1402.6315astro-ph.GAastro-ph.CO
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S $^4$ G半导体的重子Tully-Fisher关系和半导体的“凝聚”重子分数

The Baryonic Tully-Fisher Relationship for S$^4$G Galaxies and the "Condensed" Baryon Fraction of Galaxies

Dennis Zaritsky, Helene Courtois, Juan-Carlos Muñoz-Mateos, Jenny Sorce, S. Erroz-Ferrer, S. Comerón, D. A. Gadotti, A. Gil de Paz, J. L. Hinz, E. Laurikainen, … 展开作者

Dennis Zaritsky, Helene Courtois, Juan-Carlos Muñoz-Mateos, Jenny Sorce, S. Erroz-Ferrer, S. Comerón, D. A. Gadotti, A. Gil de Paz, J. L. Hinz, E. Laurikainen, T. Kim, J. Laine, K. Menéndez-Delmestre, T. Mizusawa, M. W. Regan, H. Salo, M. Seibert, K. Sheth, E. Athanassoula, A. Bosma, M. Cisternas, Luis C. Ho, B. Holwerda

摘要:

我们结合了斯皮策银河系恒星结构调查(S $^4$ G)的数据,这是Eskew等人最近校准的经验恒星质量估计器,和一个广泛的数据库HI谱线轮廓检查重子Tully-Fisher(BTF)关系。我们发现1)BTF比经典的塔利-费舍尔(TF)关系具有更低的分散性,并且更好地描述为线性关系,证实了类似的先前结果,2)在BTF中包含径向尺度降低了分散性,但只是适度地,如先前对于TF关系所看到的,以及3)BTF的斜率,我们发现它是$3.5\pm 0.2$($Δ$ log $M_{baryon}/Δ$ log $v_c$),这意味着平均而言,所有预计在晕中的重子中有一个几乎恒定的分数($\sim 0.4$)被“凝聚”到旋转支撑星系的中心区域。凝聚重子分数,$M_{baryon}/M_{total}$,是,我们的测量精度,几乎独立的星系圆周速度(我们的样本跨越圆周速度,$v_c$,60和250公里秒$^{-1}$之间,但扩展到$v_c\sim 10$公里秒$^{-1}$使用的数据从文献)。尽管有相当宽松的选择标准,但在这一部分中观察到的星系到星系的散射通常是$\le$ 2的因子。这些结果意味着,冷却和加热过程,如冷与热吸积,质量损失由于恒星风,AGN驱动的反馈,到一定程度上,他们影响的全球银河系的性质参与BTF,是独立的晕质量与$10 < v_c < 250$公里/秒的星系,并通常引入不超过两个范围的一个因素,在所产生的$M_{baryon}/M_{total}$。最近Aumer等人对一个小样本盘星系的模拟与我们的数据非常一致,这表明目前的模拟能够再现单个盘星系的全局特性。

英文摘要:

We combine data from the Spitzer Survey for Stellar Structure in Galaxies (S$^4$G), a recently calibrated empirical stellar mass estimator from Eskew et al., and an extensive database of HI spectral line profiles to examine the baryonic Tully-Fisher (BTF) relation. We find 1) that the BTF has lower scatter than the classic Tully-Fisher (TF) relation and is better described as a linear relationship, confirming similar previous results, 2) that the inclusion of a radial scale in the BTF decreases the scatter but only modestly, as seen previously for the TF relation, and 3) that the slope of the BTF, which we find to be $3.5\pm 0.2$ ($Δ$ log $M_{baryon}/Δ$ log $v_c$), implies that on average a nearly constant fraction ($\sim 0.4$) of all baryons expected to be in a halo are "condensed" onto the central region of rotationally supported galaxies. The condensed baryon fraction, $M_{baryon}/M_{total}$, is, to our measurement precision, nearly independent of galaxy circular velocity (our sample spans circular velocities, $v_c$, between 60 and 250 km s$^{-1}$, but is extended to $v_c\sim 10$ km s$^{-1}$ using data from the literature). The observed galaxy-to-galaxy scatter in this fraction is generally $\le$ a factor of 2 despite fairly liberal selection criteria. These results imply that cooling and heating processes, such as cold vs. hot accretion, mass loss due to stellar winds, and AGN driven feedback, to the degree that they affect the global galactic properties involved in the BTF, are independent of halo mass for galaxies with $10 < v_c < 250$ km/s and typically introduce no more than a factor of two range in the resulting $M_{baryon}/M_{total}$. Recent simulations by Aumer et al. of a small sample of disk galaxies are in excellent agreement with our data, suggesting that current simulations are capable of reproducing the global properties of individual disk galaxies.

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