Clustered star formation in the center of NGC 253 contributes to driving the ionized nuclear wind
| Autor: | Jonathan D. Henshaw, Adam K. Leroy, Alberto D. Bolatto, Laura K. Zschaechner, Adam Ginsburg, Sylvain Veilleux, Kunihiko Tanaka, Rebecca C. Levy, Frederick M. Walter, Mark Gorski, K. L. Emig, Nico Krieger, Elisabeth A. C. Mills, Jürgen Ott, David S. Meier |
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| Přispěvatelé: | Department of Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
CENTRAL STARBURST
Milky Way Astrophysics - astrophysics of galaxies Population FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 114 Physical sciences 01 natural sciences RECOMBINATION LINE H-II REGIONS DENSE MOLECULAR GAS Interstellar medium 0103 physical sciences H II regions Cluster (physics) SGR B2 education 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Line (formation) Physics NGC-253 education.field_of_study 010308 nuclear & particles physics Star formation 847 694 1833 Astronomy and Astrophysics 115 Astronomy Space science Galaxy GALAXY Young star clusters STELLAR CLUSTERS Star cluster Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) YOUNG EMISSION |
| Zdroj: | The Astrophysical Journal, 919(2) |
| Popis: | We present new 3 mm observations of the ionized gas toward the nuclear starburst in the nearby (D ~ 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 ~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 7000-10000 K and measure an average singly-ionized helium abundance = 0.25 +/- 0.06, both of which are consistent with values measured for HII regions in the center of the Milky Way. We also report the discovery of unusually broad-linewidth 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%. Comment: ApJ Accepted. 20 pages, 8 figures |
| Databáze: | OpenAIRE |
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