Dwarf galaxies in the Coma cluster - I. Velocity dispersion measurements★†
نویسندگان
چکیده
منابع مشابه
Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane
We present intermediate-resolution spectroscopic data for a set of dwarf and giant galaxies in the Coma cluster, with −20.6 < MR < −15.7. The photometric and kinematic properties of the brighter galaxies can be cast in terms of parameters which present little scatter with respect to a set of scaling relations known as the fundamental plane. To determine the form of these fundamental scaling rel...
متن کاملDwarf Galaxies in the Coma Cluster . II . Photometry and Analysis
We use the data set derived in our previous paper (Secker & Harris 1997) to study the dwarf galaxy population in the central ≃ 700 arcmin of the Coma cluster, the majority of which are early-type dwarf elliptical (dE) galaxies. Analysis of the statistically-decontaminated dE galaxy sequence in the color-magnitude diagram reveals that the mean dE color at R = 18.0 mag is (B − R) ≃ 1.4 mag, but t...
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We present stellar velocity dispersion profiles for seven Milky Way dwarf spheroidal (dSph) satellite galaxies. We have measured 8394 line-of-sight velocities (±2.5 km s) for 6804 stars from highresolution spectra obtained at the Magellan and MMT telescopes. We combine these new data with previously published velocities to obtain the largest available kinematic samples, which include more than ...
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Deep CCD photometry and positions for a new sample of ≃ 250 dwarf elliptical (dE) galaxies in the Coma cluster core are analyzed. A significant color gradient is detected in their projected radial distribution, given by ∆(B–R)/∆(logRcc) = −0.08± 0.02 mag. Calibrating these dE galaxies against Galactic globular clusters yields a corresponding metallicity gradient which goes as Z ∝ R cc . Simulat...
متن کاملv 1 9 S ep 1 99 7 Dwarf Galaxies in the Coma Cluster . I . Detection , Measurement and Classification Techniques
Deep B− and R−band CCD images of the central ∼ 700 arcmin of the Coma cluster core have been used to measure the dwarf-galaxy population in Coma. In this paper, we describe a newly developed code for automated detection, photometry and classification of faint objects of arbitrary shape and size on digital images. Intensity-weighted moments are used to compute the positions, radial structures, e...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2012
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2011.19899.x