News Release Archive:

News Release 64 of 325

July 10, 2012 01:00 PM (EDT)

News Release Number: STScI-2012-26

Hubble Unmasks Ghost Galaxies

Technical facts about this news release:

About the Object
Object Name: Leo IV
Object Description: Ultra-Faint Dwarf Galaxy
Position (J2000): R.A. 11h 32m 57s.00
Dec. -00° 31' 59".99
Constellation: Leo
Distance: 500,000 light-years (150,000 parsecs)
About the Data
Data Description: The image was created from Hubble data from proposal 12549: T. Brown (STScI), et al. The science team comprises T. Brown and J. Tumlinson (STScI), M. Geha (Yale University), E. Kirby (California Institute of Technology), D. VandenBerg (University of Victoria), R. Munoz (Universidad de Chile), J. Kalirai (STScI), J. Simon (Observatories of the Carnegie Institute of Washington), R. Avila (STScI), P. Guhathakurta (UCO/Lick Observatory), A. Renzini (Osservatorio Astronomico), and H. Ferguson (STScI).
Instrument: ACS/WFC
Exposure Date(s): January 1, 2012
Exposure Time: 11.4 hours
Filters: F606W (V) and F814W (I)
About the Release
Credit: NASA, ESA, and T. Brown (STScI)
Color: This image is a composite of separate exposures acquired by the ACS instrument. Several filters were used to sample various wavelengths. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:
F606W (V) blue
F814W (I) orange