NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-21 T11:37:42 PDT
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For refcode 2004A&A...415..123P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2004A&A...415..123P VLT spectroscopy of globular cluster systems I. The photometric and spectroscopic data set T. H. Puzia, M. Kissler-Patig, D. Thomas, C. Maraston, R. P. Saglia, R. Bender, T. Richtler, P. Goudfrooij and M. Hempel Received 14 May 2003 / Accepted 11 September 2003 We present Lick line-index measurements of extragalactic globular clusters in seven early-type galaxies (NGC 1380, 2434, 3115, 3379, 3585, 5846, and 7192) with different morphological types (E-S0) located in field and group/cluster environments. High-quality spectra were taken with the FORS2 instrument at ESO's Very Large Telescope. ~ 50% of our data allows an age resolution {DELTA} t/t~0.3 and a metallicity resolution ~ 0.25-0.4 dex, depending on the absolute metallicity. Globular cluster candidates are selected from deep B, V, R, I, K FORS2/ISAAC photometry with 80-100% success rate inside one effective radius. Using combined optical/near-infrared colour-colour diagrams we present a method to efficiently reduce fore-/background contamination down to ~< 10%. We find clear signs for bi-modality in the globular cluster colour distributions of NGC 1380, 3115, and 3585. The colour distributions of globular clusters in NGC 2434, 3379, 5846, and 7192 are consistent with a broad single-peak distribution. For the analysed globular cluster systems the slopes of projected radial surface density profiles, of the form {SIGMA}(R)~ R,^-^{GAMMA}, vary between ~ 0.8 and 2.6. Blue and red globular cluster sub-populations show similar slopes in the clearly bi-modal systems. For galaxies with single-peak globular cluster colour distributions, there is a hint that the blue cluster system seems to have a more extended radial distribution than the red one. Using globular clusters as a tracer population we determine total dynamical masses of host galaxies out to large radii (1.6-4.8, R_eff_). For the sample we find masses in the range ~ 8.8 x 10^10^ M_sun_ up to ~ 1.2 x 10^12^ M_sun_. The line index data presented here will be used in accompanying papers of this series to derive ages, metallicities and abundance ratios. A compilation of currently available high-quality Lick index measurements for globular clusters in elliptical, lenticular, and late-type galaxies is provided and will serve to augment the current data set. Keywords: galaxies: star clusters, galaxies: general
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