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J/MNRAS/445/630 Early-type galaxies in Ursa Major cluster (Pak+, 2014)
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Beginning of ReadMe :J/MNRAS/445/630 Early-type galaxies in Ursa Major cluster (Pak+, 2014)
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The properties of early-type galaxies in the Ursa Major cluster.
Pak M., Rey S.-C., Lisker T., Lee Y., Kim S., Sung E.-C., Jerjen H.,
Chung J.
<Mon. Not. R. Astron. Soc., 445, 630-647 (2014)>
=2014MNRAS.445..630P
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ADC_Keywords: Clusters, galaxy ; Morphology ; Photometry, SDSS ;
Photometry, ultraviolet
Keywords: galaxies: clusters: individual: Ursa Major - galaxies: dwarf -
galaxies: evolution - galaxies: structure
Abstract:
Using SDSS-DR7 and NASA/IPAC Extragalactic Database spectroscopic
data, we identify 166 galaxies as members of the Ursa Major cluster
with M_r_<-13.5mag. We morphological classify all
galaxies by means of carefully inspecting g-, r-, i-band colour and
monochromatic images. We show that the Ursa Major cluster is dominated
by late-type galaxies, but also contains a significant number of
early-type galaxies, particularly in the dwarf regime. We present
further evidence for the existence of several subgroups in the
cluster, consistent with previous findings. The early-type fraction is
found to correlate with the mass of the subgroup. We also investigate
environmental effects by comparing the properties of the Ursa Major
early-type dwarf galaxies to those of the Virgo cluster. In contrast
to the Virgo, the red sequence of the Ursa Major cluster is only
sparsely populated in the optical and ultraviolet colour-magnitude
relations. It also shows a statistically significant gap between
-18<M_r_<-17mag, i.e. the Ursa Major cluster lacks early-type dwarf
galaxies at the bright end of their luminosity function. We discover
that the majority of early-type dwarf galaxies in the Ursa Major
cluster have blue cores with hints of recent or ongoing star
formation. We suggest that gravitational tidal interactions can
trigger central blue star-forming regions in early-type dwarfs. After
that, star formation would only fade completely when the galaxies
experience ram-pressure stripping or harassment, both of which are
nearly absent in the Ursa Major cluster.
Description:
Our sample in the Ursa Major cluster is predominantly based on the
SDSS Data Release 7 (DR7; Abazajian et al., 2009ApJS..182..543A).
In order to investigate the ultraviolet properties of our sample
galaxies in the Ursa Major cluster, we used far-ultraviolet (FUV,
1350-1750AA) and near-ultraviolet (NUV, 1750-2750AA) images from
the GALEX GR6.