News Release Archive:

News Release 20 of 44

July 3, 2007 09:00 AM (EDT)

News Release Number: STScI-2007-26

Stellar Fireworks Are Ablaze in Galaxy NGC 4449

Technical facts about this news release:

About the Object
Object Name: NGC 4449
Object Description: Magellanic dwarf irregular galaxy
Position (J2000): R.A. 12h 28m 10s.96
Dec. +44° 05' 33".4
Constellation: Canes Venatici
Distance: Approximately 13 million light-years (4 Mpc) away.
Dimensions: This image is 5 arcminutes (19,000 light-years or 6 kiloparsecs) wide.
About the Data
Data Description: The Hubble image was created from HST data from proposal 10585: A. Aloisi (STScI/ESA), F. Annibali, C. Leitherer, and J. Mack (STScI), M. Sirianni (STScI/ESA), M. Tosi (INAF, Astronomical Observatory of Bologna), and R. van der Marel (STScI).
Instrument: ACS/WFC
Exposure Date(s): November 2005
Exposure Time: 5.3 hours
Filters: F435W (B), F555W (V), F658N (Halpha+[N II]), and F814W (I)
About the Image
Image Credit: NASA, ESA, A. Aloisi (STScI/ESA), and The Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration
Release Date: July 3, 2007

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

F435W (B) blue
F555W (V) green
F658N (Halpha+[N II]) and F814W (I) red


Orientation: Stellar Fireworks Are Ablaze in Galaxy NGC 4449