Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-06
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy and Astrophysics. 10 pages, 6 figures. Table 6 and Fig. 6 will only be published in the
Scientific paper
10.1051/0004-6361:200810084
CONTEXT: 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. AIMS: 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. METHODS: VLT/FORS2 multislit spectroscopy in combination with the Lick/IDS system was used to derive velocities and to constrain metallicities and [alpha/Fe] element ratio of the globular clusters. RESULTS: 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 H_beta, H_gamma, and H_delta and the combined [MgFe]' index, we found that the globular clusters are metal-poor [Z/H]<=-0.33 dex and [alpha/Fe]<=0.0 element ratio. These results argue in favor of a population of globular clusters formed during the assembling of the galaxy.
Kissler-Patig Markus
Larsen Soeren S.
Mora Marcelo D.
No associations
LandOfFree
Spectroscopy of globular clusters in the low-luminosity spiral galaxy NGC 45 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spectroscopy of globular clusters in the low-luminosity spiral galaxy NGC 45, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectroscopy of globular clusters in the low-luminosity spiral galaxy NGC 45 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-212951