Max Planck Institute for Astronomy - Annual Report 2007

54 II. Highlights
Follow-up Observations relating to Dwarf Galaxies and
the new Globular Cluster
The astronomers observed the newly discovered dwarf
galaxies (with the exception of Leo IV) in detail with the
su b a r u telescope on Hawaii and the Isaac Newton telescope
(INT) on La Palma. Fig. II.7.4 shows in the first
column the SDSS images of the corresponding objects
as well as the positions of the su b a r u and INT fields.
The second column shows filtered images with a kernel
of 4. The dotted circles indicate those regions in which
the color-brightness diagram of stars was established.
Contour lines indicating the color brightness diagrams as
Fig. II.7.6: Comparison of the absolute luminosity and size of
different satellite systems.
M v [mag]
–16
–14
–12
–10
–8
–6
–4
–2
well as the distribution of stars are shown in Fig. II.7.5.
The derived characteristics are summarized in the following
Table.
Object
Distance
(kpc)
Dwarf galaxies of the Milky Way and M 31 (SDSS discoveries)
Dwarf galaxies of the Milky Way
Dwarf galaxies of M 31
Globular clusters of the Milky Way
Globular clusters of M 31
Ultra compact dwarf galaxies in Formax
Virgo dwarf-globular transition objects
Globular clusters of NGC 5128
0 1
radius
(pc)
Ellipticity
Com 3.m7 44 70 0.5
CVn II 150 140 0.3
Her 140 320 0.5
Leo IV 160 160 0.25
sE g U E 1 23 30 0.3
Segue 1
Willman 1
Leo IV
Com
And X
Boo
CVn II
UMa II
v 27 v 29 v 31 v 33
log(r h /pc)
And IX
Her
UMa I
CVn I
2 3