Clustered Star Formation in the Center of NGC 253 Contributes to Driving the Ionized Nuclear Wind

We present new 3 mm observations of the ionized gas toward the nuclear starburst in the nearby (D similar to 3.5 Mpc) galaxy NGC 253. With ALMA, we detect emission from the H40 alpha and He40 alpha lines in the central 200 pc of this galaxy on spatial scales of similar to 4 pc. The recombination line emission primarily originates from a population of approximately a dozen embedded super star clusters in the early stages of formation. We find that emission from these clusters is characterized by electron temperatures ranging from 7000 to 10,000 K and measures an average singly ionized helium abundance Y (+) = 0.25 +/- 0.06, both of which are consistent with values measured for H ii regions in the center of the Milky Way. We also report the discovery of unusually broad line width recombination line emission originating from seven of the embedded clusters. We suggest that these clusters contribute to the launching of the large-scale hot wind observed to emanate from the central starburst. Finally, we use the measured recombination line fluxes to improve the characterization of overall embedded cluster properties, including the distribution of cluster masses and the fractional contribution of the clustered star formation to the total starburst, which we estimate is at least 50%.

Gorski, Mark,1989Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)markgo (author)
Emig, K. L.Universiteit Leiden (UL),Leiden University (UL),National Radio Astronomy Observatory (author)
Bolatto, A. D.University of Maryland,Flatiron Institute (author)
Levy, R. C.University of Maryland (author)
Leroy, A. K.Ohio State University (author)
Ginsburg, A.University of Florida (author)
Henshaw, J. D.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Zschaechner, L. K.Helsingin Yliopisto,University of Helsinki (author)
Veilleux, S.University of Maryland (author)
Tanaka, K.Keio University (author)
Meier, D. S.National Radio Astronomy Observatory Socorro,New Mexico Institute of Mining and Technology (author)
Walter, F.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Krieger, N.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Ott, J.National Radio Astronomy Observatory Socorro (author)
University of KansasChalmers tekniska högskola (creator_code:org_t)

By the author/editor: Mills, E. A. C.; Gorski, Mark, 19 ...; Emig, K. L.; Bolatto, A. D.; Levy, R. C.; Leroy, A. K.; show more...; Ginsburg, A.; Henshaw, J. D.; Zschaechner, L. ...; Veilleux, S.; Tanaka, K.; Meier, D. S.; Walter, F.; Krieger, N.; Ott, J.; show less...

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