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2012MNRAS.420.2819K - Mon. Not. R. Astron. Soc., 420, 2819-2834 (2012/March-2)
Dwarf galaxies in the Coma cluster – I. Velocity dispersion measurements.
KOURKCHI E., KHOSROSHAHI H.G., CARTER D., KARICK A.M., MARMOL-QUERALTO E., CHIBOUCAS K., TULLY R.B., MOBASHER B., GUZMAN R., MATKOVIC A. and GRUEL N.
Abstract (from CDS):
This paper (Paper I) focuses on the measurement of the velocity dispersion and their error estimates. The measurements were performed using penalized pixel fitting (PPXF) and using the calcium triplet absorption lines. We use Monte Carlo bootstrapping to study various sources of uncertainty in our measurements, namely statistical uncertainty, template mismatch and other systematics. We find that the main source of uncertainty is the template mismatch effect which is reduced by using templates with a range of spectral types.
Combining our measurements with those from the literature, we study the Faber–Jackson relation (L∝σα) and find that the slope of the relation is α= 1.99±0.14 for galaxies brighter than MR ≃ -16 mag. A comprehensive analysis of the results combined with the photometric properties of these galaxies is reported in Paper II. Dwarf galaxies in the Coma cluster – II. Spectroscopic and photometric fundamental planes
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): galaxies: clusters: individual: Coma - galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: fundamental parameters - galaxies: kinematics and dynamics
Simbad objects: 74
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