2020
DOI: 10.3847/1538-4357/abb67d
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Super Star Clusters in the Central Starburst of NGC 4945

Abstract: The nearby (3.8 Mpc) galaxy NGC 4945 hosts a nuclear starburst and Seyfert type 2 active galactic nucleus (AGN). We use the Atacama Large Millimeter/submillimeter Array (ALMA) to image the 93 GHz (3.2 mm) free–free continuum and hydrogen recombination line emission (H40α and H42α) at 2.2 pc (0.″12) resolution. Our observations reveal 27 bright, compact sources with FWHM sizes of 1.4–4.0 pc, which we identify as candidate super star clusters. Recombination line emission, tracing the ionizing photon rate of the … Show more

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Cited by 35 publications
(56 citation statements)
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“…From our new estimate of the total stellar masses of the embedded clusters, we find that this is comparable to the total gas mass associated with these sources from L18 (Table 4). This suggests that many of these sources are still in the process of forming and supports the assumption of a ZAMS population for the overall NGC 253 starburst, compared to the older burst age of 5 Myr adopted by Emig et al (2020) for the central starburst in NGC 4945.…”
Section: Evolution Of the Starburstsupporting
confidence: 76%
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“…From our new estimate of the total stellar masses of the embedded clusters, we find that this is comparable to the total gas mass associated with these sources from L18 (Table 4). This suggests that many of these sources are still in the process of forming and supports the assumption of a ZAMS population for the overall NGC 253 starburst, compared to the older burst age of 5 Myr adopted by Emig et al (2020) for the central starburst in NGC 4945.…”
Section: Evolution Of the Starburstsupporting
confidence: 76%
“…Additionally, we can also make a direct comparison with NGC 4945 to determine a relative age for the two bursts. As seen in Emig et al (2020), there is substantially more nonthermal emission (due to supernova remnants) intermixed with the cluster emission. The clusters in NGC 4945 also have smaller gas fractions (typically an order of magnitude less than the stellar mass).…”
mentioning
confidence: 89%
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