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arXiv 1506.02809astro-ph.GA
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哈勃序列中的CALIFA调查:星系如何生长其凸起和盘

The CALIFA survey across the Hubble sequence: How galaxies grow their bulges and disks

R. M. González Delgado, R. García-Benito, E. Pérez, R. Cid Fernandes, A. L. de Amorim, C. Cortijo-Ferrero, E. A. D. Lacerda, R. López Fernández, N. Vale-Asari, … 展开作者

R. M. González Delgado, R. García-Benito, E. Pérez, R. Cid Fernandes, A. L. de Amorim, C. Cortijo-Ferrero, E. A. D. Lacerda, R. López Fernández, N. Vale-Asari, S. Sánchez, CALIFA collaboration

摘要:

我们详细描述的径向结构的恒星人口属性的300个星系在附近的宇宙中,观察到的积分场光谱在CALIFA调查。样本涵盖了广泛的哈勃类型,从球状到螺旋星系,恒星质量从$M_\star \sim 10^9$到$7 \times 10^{11}$ $M_\odot$不等。利用光谱合成技术,我们得到了恒星质量面密度($μ_\star$)、质量加权年龄($\langle {\rm log}\,age\rangle _L$、$\langle {\rm log}\,age\rangle _M$)和质量加权金属丰度($\langle {\rm log}\,Z_\star\rangle _M$)。我们研究了星系恒星质量、$M_\star$和形态(E、S0、Sa、Sb、Sbc、Sc和Sd)的平均趋势。我们证实,更大质量的星系更紧凑,更古老,更富含金属,更少的尘埃变红。此外,我们发现,这些趋势在空间上与核的径向距离。这些关系的偏离似乎与哈勃类型相关:对于给定的M $_\star$,早期类型更紧凑、更古老、更富含金属,这证明猝灭与形态有关,但不是由质量驱动的。

英文摘要:

We characterize in detail the radial structure of the stellar population properties of 300 galaxies in the nearby universe, observed with integral field spectroscopy in the CALIFA survey. The sample covers a wide range of Hubble types, from spheroidal to spiral galaxies, ranging in stellar masses from $M_\star \sim 10^9$ to $7 \times 10^{11}$ $M_\odot$. We derive the stellar mass surface density ($μ_\star$), light-weighted and mass-weighted ages ($\langle {\rm log}\,age\rangle _L$, $\langle {\rm log}\,age\rangle _M$), and mass-weighted metallicity ($\langle {\rm log}\,Z_\star\rangle _M$), applying the spectral synthesis technique. We study the mean trends with galaxy stellar mass, $M_\star$, and morphology (E, S0, Sa, Sb, Sbc, Sc and Sd). We confirm that more massive galaxies are more compact, older, more metal rich, and less reddened by dust. Additionally, we find that these trends are preserved spatially with the radial distance to the nucleus. Deviations from these relations appear correlated with Hubble type: earlier types are more compact, older, and more metal rich for a given M$_\star$, which evidences that quenching is related to morphology, but not driven by mass.

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