SIMBAD references

2016ApJ...819...77L - Astrophys. J., 819, 77 (2016/March-1)

Globular clusters and spur clusters in NGC 4921, the brightest spiral galaxy in the Coma cluster.

LEE M.G. and JANG I.S.

Abstract (from CDS):

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 3x105 M. 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) {#8804} 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 MI(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, H0= 77.9±3.6 km/s/Mpc. We estimate the GC specific frequency of NGC 4921 to be SN= 1.29±0.25, close to the values for early-type galaxies. This indicates that NGC 4921 is in the transition phase to S0s.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: (Coma, NGC 4921, NGC 4874, NGC 4889) - galaxies: distances and redshifts - galaxies: star clusters: general

Simbad objects: 13

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