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Traits of Accreting Galaxies

18 Dec 2018, 18:16 UTC
Traits of Accreting Galaxies
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Title: Anomalously low metallicity regions in MaNGA star-forming galaxies: Accretion caught in action?Authors: Hsiang-Chih Hwang, J. K. Barrera-Ballesteros, T. M. Heckman, K. Rowlands, L. Lin, V. Rodriguez-Gomez, H-A. Pan, B-C. Hsieh, S. Sanchez, D. Bizyaev, J. Sanchez Almeida, D. A. Thilker, J. M. Lotz, A. Jones, P. Nair, B. H. Andrews, N. DroryFirst Author’s Institution: Johns Hopkins University, Baltimore, MDStatus: Accepted to the Astronomical Journal, open access on arXiv Looking at a galaxy, the first thing we are likely to notice is its stars. All stars, whether they are massive, bright, short-lived blue stars or small, dim, long-lived red stars, form in regions called stellar nurseries, which are pockets of cold, dense molecular gas. Given the correct conditions, this gas will collapse and begin to form stars. Consequently, the abundance of gas within a galaxy can be treated as a measure of its ability to form stars. A problem arises though: given the rate of star formation observed in the nearby Universe (0.3-1 solar masses per year), most galaxies should run out of gas quite quickly and, once this fuel is depleted, should stop forming stars completely. Obviously these galaxies are somehow acquiring gas, but it is very difficult to ...

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