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arXiv 1707.06362astro-ph.GA
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棒旋星系的恒星形成活动

Star formation activity of barred spiral galaxies

Eunbin Kim, Ho Seong Hwang, Haeun Chung, Gwang-Ho Lee, Changbom Park, Bernardo Cervantes Sodi, Sungsoo S. Kim

摘要:

我们利用斯隆数字巡天的晚型星系样本(0.02 $\leq z \leq$ 0.05489和$M_r <-19.5$)研究了附近带条星系的恒星形成活动。我们比较了强和弱棒星系的物理性质与非棒星系,有恒星质量和红移分布类似的棒星系。我们发现,用星爆、$\it{g-r}$、NUV $-r$和中红外[3.4]、$-$ [12]色探测的强棒星系的恒星形成活动,平均而言,低于非棒星系。然而,弱棒星系在棒星系和非棒星系之间并没有表现出这样的差异。在强棒星系中,原子和分子气体的量小于非棒星系,气体金属丰度在强棒星系中高于非棒星系。弱棒星系的气体性质再次显示出与非棒星系的气体性质没有区别。我们堆叠的光学光谱的酒吧和非酒吧星系在几个质量箱和适合堆叠的光谱与光谱拟合代码,星光。我们没有发现显着差异的恒星星族之间的酒吧和非酒吧的强和弱酒吧星系。我们的研究结果是一致的想法,即恒星形成活动的棒星系是增强在过去随着显着的气体消耗,目前低于或类似于非棒星系。过去的恒星形成增强取决于棒的强度。

英文摘要:

We study the star formation activity of nearby galaxies with bars using a sample of late-type galaxies at 0.02$\leq z \leq$ 0.05489 and $M_r <-19.5$ from the Sloan Digital Sky Survey. We compare the physical properties of strongly and weakly barred galaxies with those of non-barred galaxies that have stellar mass and redshift distributions similar to barred galaxies. We find that the star formation activity of strongly barred galaxies probed by starburstiness, $\it{g-r}$, NUV$-r$, and mid-infrared [3.4]$-$[12] colors is, on average, lower than that of non-barred galaxies. However, weakly barred galaxies do not show such a difference between barred and non-barred galaxies. The amounts of atomic and molecular gas in strongly barred galaxies are smaller than those of non-barred galaxies, and the gas metallicity is higher in strongly barred galaxies than in non-barred galaxies. The gas properties of weakly barred galaxies again show no difference from those of non-barred galaxies. We stack the optical spectra of barred and non-barred galaxies in several mass bins and fit to the stacked spectra with a spectral fitting code, STARLIGHT. We find no significant difference in stellar populations between barred and non-barred galaxies for both strongly and weakly barred galaxies. Our results are consistent with the idea that the star formation activity of barred galaxies is enhanced in the past along with significant gas consumption, and is currently lower than or similar to that of non-barred galaxies. The past star formation enhancement depends on the strength of bars.

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