The growth of the central region by acquisition of counterrotating gas in star-forming galaxiesTools Chen, Yan-Mei and Shi, Yong and Tremonti, Christy A. and Bershady, Matt and Merrifield, Michael and Emsellem, Eric and Jin, Yi-Fei and Huang, Song and Fu, Hai and Wake, David A. and Bundy, Kevin and Stark, David and Lin, Lihwai and Argudo-Fernandez, Maria and Bergmann, Thaisa Storchi and Bizyaev, Dmitry and Brownstein, Joel and Bureau, Martin and Chisholm, John and Drory, Niv and Guo, Qi and Hao, Lei and Hu, Jian and Li, Cheng and Li, Ran and Lopes, Alexandre Roman and Pan, Kai-Ke and Riffel, Rogemar A. and Thomas, Daniel and Wang, Lan and Westfall, Kyle and Yan, Ren-Bin (2016) The growth of the central region by acquisition of counterrotating gas in star-forming galaxies. Nature Communications, 7 . 13269/1-13269/9. ISSN 2041-1723
Official URL: http://www.nature.com/articles/ncomms13269
AbstractGalaxies grow through both internal and external processes. In about 10% of nearby red galaxies with little star formation, gas and stars are counter-rotating, demonstrating the importance of external gas acquisition in these galaxies. However, systematic studies of such phenomena in blue, star-forming galaxies are rare, leaving uncertain the role of external gas acquisition in driving evolution of blue galaxies. Here, based on new measurements with integral field spectroscopy of a large representative galaxy sample, we find an appreciable fraction of counter-rotators among blue galaxies (9 out of 489 galaxies). The central regions of blue counter-rotators show younger stellar populations and more intense, ongoing star formation than their outer parts, indicating ongoing growth of the central regions. The result offers observational evidence that the acquisition of external gas in blue galaxies is possible; the interaction with pre-existing gas funnels the gas into nuclear regions (<1 kpc) to form new stars.
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