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- W3102298224 abstract "NGC 4589, a bright E2 merger-remnant galaxy, hosts the peculiar fast and faint calcium-rich SN Ib SN 2005cz. The progenitor of Ca-rich SNe Ib has been controversial: it could be (1) a young, massive star with 6–12 M⊙ in a binary system, or (2) an old, low-mass star in a binary system that was kicked out from the galaxy center. Moreover, previous distance estimates for this galaxy have shown a large spread, ranging from 20 to 60 Mpc. Thus, using archival Hubble Space Telescope/ACS F435W, F555W, and F814W images, we search for star clusters in NGC 4589 in order to help resolve these issues. We find a small population of young star clusters with 25 < V ≤ 27 (−7.1 < MV ≤ −5.1) mag and age <1 Gyr in the central region at R < 05 (<3.8 kpc), thus supporting the massive-star progenitor scenario for SN 2005cz. In addition to young star clusters, we also find a large population of old globular clusters. In contrast to previous results in the literature, we find that the color distribution of the globular clusters is clearly bimodal. The turnover (Vega) magnitude in the V-band luminosity functions of the blue (metal-poor) globular clusters is determined to be V0(max) = 24.40 ± 0.10 mag. We derive the total number of globular clusters, NGC = 640 ± 50, and the specific frequency, SN = 1.7 ± 0.2. Adopting a calibration for the metal-poor globular clusters, MV(max) = −7.66 ± 0.14 mag, we derive a distance to this galaxy: (m − M)0 = 32.06 ± 0.10(ran) ± 0.15(sys) (d = 25.8 ± 2.2 Mpc)." @default.
- W3102298224 created "2020-11-23" @default.
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- W3102298224 date "2019-01-21" @default.
- W3102298224 modified "2023-10-14" @default.
- W3102298224 title "Star Clusters in the Elliptical Galaxy NGC 4589 Hosting a Calcium-rich SN Ib (SN 2005cz)" @default.
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- W3102298224 doi "https://doi.org/10.3847/1538-4357/aaf72c" @default.
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