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arXiv 1709.01035astro-ph.GA
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从CALIFA样本看局部宇宙中的恒星形成。II。鼓包、棒和盘中的激活和淬火机制

Star formation in the local Universe from the CALIFA sample. II. Activation and quenching mechanisms in bulges, bars, and disks

C. Catalán-Torrecilla, A. Gil de Paz, A. Castillo-Morales, J. Méndez-Abreu, J. Falcón-Barroso, S. Bekeraite, L. Costantin, A. de Lorenzo-Cáceres, E. Florido, R.… 展开作者

C. Catalán-Torrecilla, A. Gil de Paz, A. Castillo-Morales, J. Méndez-Abreu, J. Falcón-Barroso, S. Bekeraite, L. Costantin, A. de Lorenzo-Cáceres, E. Florido, R. García-Benito, B. Husemann, J. Iglesias-Páramo, R. C. Kennicutt, D. Mast, S. Pascual, T. Ruiz-Lara, L. Sánchez-Menguiano, S. F. Sánchez, C. J. Walcher, J. Bland-Hawthorn, S. Duarte Puertas, R. A. Marino, J. Masegosa, P. Sánchez-Blázquez, CALIFA Collaboration

摘要:

我们估计目前的修正的H $α$恒星形成率(SFR)的不同形态的组成部分,形成星系(凸起,酒吧和磁盘)。我们使用的多组分光度分解的基础上SDSS成像CALIFA积分场光谱数据管的219个星系的样本。分析表明棒星系的中心SFR和特定SFR(sSFR $=$ SFR/ $M_{\star}$)增强。沿着主序星,我们发现更多的大质量星系都经历了有效的恒星形成抑制(淬火),这与许多研究一致。我们发现,更大质量的盘也有它们的恒星形成淬火。我们评估哪些机制可能是负责这个淬火过程。2型活动星系核的存在起着阻尼sSFR的作用,在凸起和磁盘效率较低。此外,对于质量约为10 $^{10.5}$ M $_{\odot}$的恒星,盘部分的sSFR的降低变得更加明显;对于凸起,它已经存在于$\sim$ 10 $^{9.5}$ M $_{\odot}$。对球核分量的视线恒星速度色散(PDMATHAMT)和相应的Faber-Jackson关系的分析表明,对于相同的质量,活动星系核往往具有比恒星形成星系略高的PDMATHAMT值。最后,利用投影星系密度$Σ$ $_{5}$对环境影响进行了评价。我们发现,在中高密度的环境中,凸起和磁盘的SFR降低。这项工作反映了IFS数据与2D多组分分解相结合的潜力,以揭示调节SFR的过程。

英文摘要:

We estimate the current extinction-corrected H$α$ star formation rate (SFR) of the different morphological components that shape galaxies (bulges, bars, and disks). We use a multi-component photometric decomposition based on SDSS imaging to CALIFA Integral Field Spectroscopy datacubes for a sample of 219 galaxies. This analysis reveals an enhancement of the central SFR and specific SFR (sSFR $=$ SFR/$M_{\star}$) in barred galaxies. Along the Main Sequence, we find more massive galaxies in total have undergone efficient suppression (quenching) of their star formation, in agreement with many studies. We discover that more massive disks have had their star formation quenched as well. We evaluate which mechanisms might be responsible for this quenching process. The presence of type-2 AGNs plays a role at damping the sSFR in bulges and less efficiently in disks. Also, the decrease in the sSFR of the disk component becomes more noticeable for stellar masses around 10$^{10.5}$ M$_{\odot}$; for bulges, it is already present at $\sim$10$^{9.5}$ M$_{\odot}$. The analysis of the line-of-sight stellar velocity dispersions ($σ$) for the bulge component and of the corresponding Faber-Jackson relation shows that AGNs tend to have slightly higher $σ$ values than star-forming galaxies for the same mass. Finally, the impact of environment is evaluated by means of the projected galaxy density, $Σ$$_{5}$. We find that the SFR of both bulges and disks decreases in intermediate-to-high density environments. This work reflects the potential of combining IFS data with 2D multi-component decompositions to shed light on the processes that regulate the SFR.

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