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• W3205816811 abstract "The stellar mass-stellar metallicity relation (MZR) is an essential approach to probe the chemical evolution of galaxies. It reflects the balance between galactic feedback and gravitational potential as a function of stellar mass. However, the current MZR of local dwarf satellite galaxies (M* <~ 10^8 Msun, measured from resolved stellar spectroscopy) may not be reconcilable with that of more massive galaxies (M* >~ 10^9.5 Msun, measured from integrated-light spectroscopy). Such a discrepancy may result from a systematic difference between the two methods, or it may indicate a break in the MZR around 10^9 Msun. To address this question, we measured the stellar metallicity of NGC 147 from integrated light using the Palomar Cosmic Web Imager (PCWI). We compared the stellar metallicity estimates from integrated light with the measurements from resolved stellar spectroscopy and found them to be consistent within 0.1 dex. On the other hand, the high-mass MZR overpredicts the metallicity by 0.6 dex at the mass of NGC 147. Therefore, our results tentatively suggest that the discrepancy between the low-mass MZR and high-mass MZR should not be attributed to a systematic difference in techniques. Instead, real physical processes cause the transition in the MZR. In addition, we discovered a positive age gradient in the innermost region and a negative metallicity gradient from the resolved stars at larger radii, suggesting a possible outside-in formation of NGC 147." @default.
• W3205816811 created "2021-10-25" @default.
• W3205816811 creator A5021303177 @default.
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• W3205816811 creator A5028893953 @default.
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• W3205816811 date "2021-10-01" @default.
• W3205816811 modified "2023-10-18" @default.
• W3205816811 title "NGC 147 Corroborates the Break in the Stellar Mass–Stellar Metallicity Relation for Galaxies" @default.
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• W3205816811 doi "https://doi.org/10.3847/1538-4357/ac1340" @default.
• W3205816811 hasPublicationYear "2021" @default.
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