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Date and Time of the Query: 2019-07-22 T20:03:16 PDT
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For refcode 2016ApJ...819...77L:
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2016ApJ...819...77L Globular Clusters and Spur Clusters in NGC 4921, the Brightest Spiral Galaxy in the Coma Cluster Lee, Myung Gyoon; Jang, In Sung Abstract. We resolve a significant fraction of globular clusters (GCs) in NGC 4921, the brightest spiral galaxy in the Coma cluster. We also find a number of extended bright star clusters (star complexes) in the spur region of the arms. The latter are much brighter and bluer than those in the normal star-forming region, being as massive as 3 x 10^5^ M_sun_. The color distribution of the GCs in this galaxy is found to be bimodal. The turnover magnitudes of the luminosity functions of the blue (metal-poor) GCs (0.70 < (V - I) <= 1.05) in the halo are estimated V(max) = 27.11 +/- 0.09 mag and I(max) = 26.21 +/- 0.11 mag. We obtain similar values for NGC 4923, a companion S0 galaxy, and two Coma cD galaxies (NGC 4874 and NGC 4889). The mean value for the turnover magnitudes of these four galaxies is I(max) = 26.25 +/- 0.03 mag. Adopting M_I_ (max) = -8.56 +/- 0.09 mag for the metal-poor GCs, we determine the mean distance to the four Coma galaxies to be 91 +/- 4 Mpc. Combining this with the Coma radial velocity, we derive a value of the Hubble constant, H_0_ = 77.9 +/- 3.6 km s^-1^ Mpc^-1^. We estimate the GC specific frequency of NGC 4921 to be S_N_ = 1.29 +/- 0.25, close to the values for early-type galaxies. This indicates that NGC 4921 is in the transition phase to S0s. Key words: galaxies: clusters: individual: Coma, NGC 4921, NGC 4874, NGC 4889, galaxies: distances and redshifts, galaxies: star clusters: general
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