2008A&A...489.1065M -
Astronomy and Astrophysics, volume 489, 1065-1071 (2008/10-3)
Spectroscopy of globular clusters in the low-luminosity spiral galaxy NGC 45.
MORA M.D., LARSEN S.S. and KISSLER-PATIG M.
Abstract (from CDS):
Extragalactic globular clusters have been studied in elliptical galaxies and in a few luminous spiral galaxies, but little is known about globular clusters in low-luminosity spirals. Past observations with the ACS have shown that NGC 45 hosts a large population of globular clusters (19), as well as several young star clusters. In this work we aim to confirm the bona fide globular cluster status for 8 of 19 globular cluster candidates and to derive metallicities, ages, and velocities. VLT/FORS2 multislit spectroscopy in combination with the Lick/IDS system was used to derive velocities and to constrain metallicities and [α/Fe] element ratio of the globular clusters. We confirm the 8 globular clusters as bona fide globular clusters. Their velocities indicate halo or bulge-like kinematics, with little or no overall rotation. From absorption indices such as Hβ, Hγ, and Hδ and the combined [MgFe]' index, we found that the globular clusters are metal-poor [Z/H]≤-0.33dex and [α/Fe]≤0.0 element ratio. These results argue in favor of a population of globular clusters formed during the assembling of the galaxy.
Abstract Copyright:
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Journal keyword(s):
galaxies: individual: NGC 45 - galaxies: star clusters
Simbad objects:
23
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