General Caption: Images of the galaxy cluster the Coma Cluster in constellation Coma Berenices.
- Image 1 Caption:
"This false-color
mosaic of the
central region of the Coma Cluster
combines infrared and
visible images to reveal
thousands of faint
astronomical objects
which show us green smudges.
Green,
red, and lots of
blue---it's the
Christmas
galaxy cluster.
Features:
- Follow-up observations showed that many of these
astronomical objects
are dwarf galaxies belonging
to the Coma Cluster.
Two large elliptical galaxy,
NGC 4889
(a cD galaxy (AKA supergiant elliptical galaxy)
and NGC 4874
(a giant elliptical galaxy),
dominate the central region.
The mosaic combines
visible
data from the
Sloan Digital Sky Survey (SDSS)
(color coded blue)
with long- and short-wavelength
infrared views
(red and
green, respectively)
from NASA's
Spitzer Space Telescope.
- The Coma Cluster
is a RICH
galaxy cluster
(more than 1000 identified
galaxies)
in the constellation
Coma Berenices (Berenice's Hair)
(the only
IAU designated constellation
named for a historical person
or at least their hair:
Queen
Berenice II of Egypt (267/266--221 BCE)).
- Coma Cluster is located at distance
102.975 Mpc = 336 Mly (for
Hubble constant
= 70.5 (km/s)/Mpc)
and at
cosmological redshift
z = 0.0231 or
redshift velocity
= 6925 km/s.
Its velocity dispersion (σ) ∼ 1000 km/s. Its size scale is ∼ 14 Mpc.????
- The foreground stars in
the mosaic
(which combines images from two
CCD cameras)
have both
4 points nad
6 points
which means
one camera was held up by
4 arms and the other
by 6 arms.
- Image 2 Caption: A sky map of the central region of the Coma Cluster.
The elliptical galaxies NGC 4889 and NGC 4874 from the mosaic above can be located.
NGC stands for New General Catalogue (NGC) and IC for Index Catalogue (IC).
- Follow-up observations showed that many of these
astronomical objects
are dwarf galaxies belonging
to the Coma Cluster.
Two large elliptical galaxy,
NGC 4889
(a cD galaxy (AKA supergiant elliptical galaxy)
and NGC 4874
(a giant elliptical galaxy),
dominate the central region.
The mosaic combines
visible
data from the
Sloan Digital Sky Survey (SDSS)
(color coded blue)
with long- and short-wavelength
infrared views
(red and
green, respectively)
from NASA's
Spitzer Space Telescope.
-
Images:
- Credit/Permission:
NASA,
JPL,
Caltech,
L. Jenkins (GSFC)
2007
(uploaded to Wikimedia Commons
by User:Clh288,
2007) /
Public domain.
Image link: Wikimedia Commons: File:Ssc2007-10a1.jpg.
- Credit/Permission: ©
User:CWitte,
2005 /
CC BY-SA 3.0.
Image link: Wikimedia Commons: File:Comacl zentrum600.png.
File: Galaxies file: galaxy_cluster_coma.html.