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The growth of the central region by acquisition of counterrotating gas in star-forming galaxies

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The growth of the central region by acquisition of counterrotating gas in star-forming galaxies

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Título The growth of the central region by acquisition of counterrotating gas in star-forming galaxies
Autor Chen, Yanmei
Shi, Yong
Tremonti, Christy A.
Bershady, Matthew A.
Merrifield, Michael
Emsellem, Eric
Jin, Yifei
Huang, Song
Fu, Hai
Wake, D.A.
Bundy, Kevin
Stark, David V.
Lin, Lihwai
Argudo-Fernández, Maria
Storchi-Bergmann, Thaisa
Bizyaev, D.
Brownstein, Joel R.
Bureau, Martin
Chisholm, John P.
Drory, Niv
Guo, Qi
Hao, Lei
Hu, Jian
Li, Cheng
Li, Ran
Lopes, Alexandre Roman
Pan, K.
Riffel, Rogemar André
Thomas, Daniel B.
Wang, Lan
Westfall, Kyle B.
Yan, Renbin
Abstract Galaxies 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 counterrotators among blue galaxies (9 out of 489 galaxies). The central regions of blue counterrotators 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 (o1 kpc) to form new stars.
Contido em Nature Communications. London. Vol. 7 (Oct. 2016), 13269, 9 p.
Assunto Espectroscopia
Formacao de estrelas
Populacoes estelares
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/163681
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