News Release Archive:

News Release 113 of 828

March 12, 2009 09:00 AM (EDT)

News Release Number: STScI-2009-11

Hubble Provides New Evidence for Dark Matter Around Small Galaxies

Technical facts about this news release:

About the Object

Object Name
and Position:

[CGW2003] J031931.7+4131	03 19 31.7 +41 31 21
[CGW2003] J031910.4+4129	03 19 10.4 +41 29 37
[CGW2003] J031900.4+4129	03 19 00.4 +41 29 02
[CGW2003] J031905.2+4134	03 19 05.2 +41 34 48

Description:

Dwarf Galaxies in the Perseus Cluster

Constellation:

Perseus

Distance:

250 million light-years (77 megaparsecs)

Dimensions:

Each individual galaxy image is 25 arcseconds (30,000 light-years or 9,200 parsecs) wide.

About the Data

Science Team:	This image was created from HST data from proposal 10210: C. Conselice (University of Nottingham, U.K.), S. De Rijcke (University of Ghent, Belgium), and E. Held (Astronomical Observatory of Padua, Italy). The science team comprises S. Penny and C. Conselice (University of Nottingham, U.K.), S. De Rijcke (University of Ghent, Belgium), and E. Held (Astronomical Observatory of Padua, Italy).
Instrument:	ACS/WFC
Exposure Date(s):	January and February 2005
Exposure Time:	13 hours
Filters:	F555W (V) and F814W (I)

About the Release

Release Credit:

NASA, ESA, and C. Conselice (University of Nottingham)

Release Date:

March 12, 2009

Color:

The image is a composite of separate exposures made by the ACS instrument on the Hubble Space Telescope. Two filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:

F814W (I)	yellow
F555W (V)	blue

Orientation/Scale: